558 lines
20 KiB
Nix
558 lines
20 KiB
Nix
{ config, lib, pkgs, ... }: with lib;
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# See http://christophe.varoqui.free.fr/usage.html and
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# https://github.com/opensvc/multipath-tools/blob/master/multipath/multipath.conf.5
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let
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cfg = config.services.multipath;
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indentLines = n: str: concatStringsSep "\n" (
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map (line: "${fixedWidthString n " " " "}${line}") (
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filter ( x: x != "" ) ( splitString "\n" str )
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)
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);
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addCheckDesc = desc: elemType: check: types.addCheck elemType check
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// { description = "${elemType.description} (with check: ${desc})"; };
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hexChars = stringToCharacters "0123456789abcdef";
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isHexString = s: all (c: elem c hexChars) (stringToCharacters (toLower s));
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hexStr = addCheckDesc "hexadecimal string" types.str isHexString;
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in {
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options.services.multipath = with types; {
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enable = mkEnableOption "the device mapper multipath (DM-MP) daemon";
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package = mkOption {
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type = package;
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description = "multipath-tools package to use";
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default = pkgs.multipath-tools;
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defaultText = "pkgs.multipath-tools";
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};
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devices = mkOption {
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default = [ ];
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example = literalExpression ''
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[
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{
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vendor = "\"COMPELNT\"";
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product = "\"Compellent Vol\"";
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path_checker = "tur";
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no_path_retry = "queue";
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max_sectors_kb = 256;
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}, ...
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]
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'';
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description = ''
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This option allows you to define arrays for use in multipath
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groups.
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'';
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type = listOf (submodule {
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options = {
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vendor = mkOption {
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type = str;
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example = "COMPELNT";
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description = "Regular expression to match the vendor name";
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};
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product = mkOption {
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type = str;
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example = "Compellent Vol";
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description = "Regular expression to match the product name";
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};
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revision = mkOption {
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type = nullOr str;
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default = null;
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description = "Regular expression to match the product revision";
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};
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product_blacklist = mkOption {
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type = nullOr str;
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default = null;
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description = "Products with the given vendor matching this string are blacklisted";
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};
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alias_prefix = mkOption {
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type = nullOr str;
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default = null;
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description = "The user_friendly_names prefix to use for this device type, instead of the default mpath";
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};
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vpd_vendor = mkOption {
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type = nullOr str;
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default = null;
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description = "The vendor specific vpd page information, using the vpd page abbreviation";
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};
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hardware_handler = mkOption {
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type = nullOr (enum [ "emc" "rdac" "hp_sw" "alua" "ana" ]);
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default = null;
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description = "The hardware handler to use for this device type";
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};
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# Optional arguments
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path_grouping_policy = mkOption {
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type = nullOr (enum [ "failover" "multibus" "group_by_serial" "group_by_prio" "group_by_node_name" ]);
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default = null; # real default: "failover"
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description = "The default path grouping policy to apply to unspecified multipaths";
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};
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uid_attribute = mkOption {
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type = nullOr str;
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default = null;
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description = "The udev attribute providing a unique path identifier (WWID)";
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};
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getuid_callout = mkOption {
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type = nullOr str;
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default = null;
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description = ''
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(Superseded by uid_attribute) The default program and args to callout
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to obtain a unique path identifier. Should be specified with an absolute path.
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'';
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};
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path_selector = mkOption {
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type = nullOr (enum [
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''"round-robin 0"''
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''"queue-length 0"''
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''"service-time 0"''
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''"historical-service-time 0"''
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]);
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default = null; # real default: "service-time 0"
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description = "The default path selector algorithm to use; they are offered by the kernel multipath target";
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};
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path_checker = mkOption {
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type = enum [ "readsector0" "tur" "emc_clariion" "hp_sw" "rdac" "directio" "cciss_tur" "none" ];
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default = "tur";
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description = "The default method used to determine the paths state";
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};
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prio = mkOption {
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type = nullOr (enum [
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"none" "const" "sysfs" "emc" "alua" "ontap" "rdac" "hp_sw" "hds"
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"random" "weightedpath" "path_latency" "ana" "datacore" "iet"
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]);
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default = null; # real default: "const"
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description = "The name of the path priority routine";
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};
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prio_args = mkOption {
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type = nullOr str;
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default = null;
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description = "Arguments to pass to to the prio function";
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};
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features = mkOption {
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type = nullOr str;
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default = null;
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description = "Specify any device-mapper features to be used";
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};
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failback = mkOption {
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type = nullOr str;
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default = null; # real default: "manual"
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description = "Tell multipathd how to manage path group failback. Quote integers as strings";
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};
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rr_weight = mkOption {
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type = nullOr (enum [ "priorities" "uniform" ]);
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default = null; # real default: "uniform"
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description = ''
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If set to priorities the multipath configurator will assign path weights
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as "path prio * rr_min_io".
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'';
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};
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no_path_retry = mkOption {
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type = nullOr str;
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default = null; # real default: "fail"
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description = "Specify what to do when all paths are down. Quote integers as strings";
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};
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rr_min_io = mkOption {
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type = nullOr int;
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default = null; # real default: 1000
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description = ''
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Number of I/O requests to route to a path before switching to the next in the
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same path group. This is only for Block I/O (BIO) based multipath and
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only apply to round-robin path_selector.
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'';
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};
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rr_min_io_rq = mkOption {
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type = nullOr int;
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default = null; # real default: 1
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description = ''
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Number of I/O requests to route to a path before switching to the next in the
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same path group. This is only for Request based multipath and
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only apply to round-robin path_selector.
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'';
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};
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fast_io_fail_tmo = mkOption {
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type = nullOr str;
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default = null; # real default: 5
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description = ''
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Specify the number of seconds the SCSI layer will wait after a problem has been
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detected on a FC remote port before failing I/O to devices on that remote port.
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This should be smaller than dev_loss_tmo. Setting this to "off" will disable
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the timeout. Quote integers as strings.
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'';
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};
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dev_loss_tmo = mkOption {
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type = nullOr str;
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default = null; # real default: 600
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description = ''
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Specify the number of seconds the SCSI layer will wait after a problem has
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been detected on a FC remote port before removing it from the system. This
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can be set to "infinity" which sets it to the max value of 2147483647
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seconds, or 68 years. It will be automatically adjusted to the overall
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retry interval no_path_retry * polling_interval
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if a number of retries is given with no_path_retry and the
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overall retry interval is longer than the specified dev_loss_tmo value.
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The Linux kernel will cap this value to 600 if fast_io_fail_tmo
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is not set.
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'';
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};
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flush_on_last_del = mkOption {
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type = nullOr (enum [ "yes" "no" ]);
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default = null; # real default: "no"
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description = ''
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If set to "yes" multipathd will disable queueing when the last path to a
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device has been deleted.
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'';
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};
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user_friendly_names = mkOption {
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type = nullOr (enum [ "yes" "no" ]);
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default = null; # real default: "no"
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description = ''
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If set to "yes", using the bindings file /etc/multipath/bindings
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to assign a persistent and unique alias to the multipath, in the
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form of mpath. If set to "no" use the WWID as the alias. In either
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case this be will be overridden by any specific aliases in the
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multipaths section.
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'';
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};
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detect_prio = mkOption {
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type = nullOr (enum [ "yes" "no" ]);
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default = null; # real default: "yes"
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description = ''
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If set to "yes", multipath will try to detect if the device supports
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SCSI-3 ALUA. If so, the device will automatically use the sysfs
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prioritizer if the required sysf attributes access_state and
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preferred_path are supported, or the alua prioritizer if not. If set
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to "no", the prioritizer will be selected as usual.
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'';
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};
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detect_checker = mkOption {
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type = nullOr (enum [ "yes" "no" ]);
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default = null; # real default: "yes"
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description = ''
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If set to "yes", multipath will try to detect if the device supports
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SCSI-3 ALUA. If so, the device will automatically use the tur checker.
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If set to "no", the checker will be selected as usual.
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'';
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};
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deferred_remove = mkOption {
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type = nullOr (enum [ "yes" "no" ]);
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default = null; # real default: "no"
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description = ''
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If set to "yes", multipathd will do a deferred remove instead of a
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regular remove when the last path device has been deleted. This means
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that if the multipath device is still in use, it will be freed when
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the last user closes it. If path is added to the multipath device
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before the last user closes it, the deferred remove will be canceled.
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'';
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};
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san_path_err_threshold = mkOption {
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type = nullOr str;
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default = null;
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description = ''
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If set to a value greater than 0, multipathd will watch paths and check
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how many times a path has been failed due to errors.If the number of
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failures on a particular path is greater then the san_path_err_threshold,
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then the path will not reinstate till san_path_err_recovery_time. These
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path failures should occur within a san_path_err_forget_rate checks, if
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not we will consider the path is good enough to reinstantate.
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'';
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};
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san_path_err_forget_rate = mkOption {
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type = nullOr str;
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default = null;
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description = ''
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If set to a value greater than 0, multipathd will check whether the path
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failures has exceeded the san_path_err_threshold within this many checks
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i.e san_path_err_forget_rate. If so we will not reinstante the path till
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san_path_err_recovery_time.
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'';
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};
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san_path_err_recovery_time = mkOption {
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type = nullOr str;
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default = null;
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description = ''
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If set to a value greater than 0, multipathd will make sure that when
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path failures has exceeded the san_path_err_threshold within
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san_path_err_forget_rate then the path will be placed in failed state
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for san_path_err_recovery_time duration. Once san_path_err_recovery_time
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has timeout we will reinstante the failed path. san_path_err_recovery_time
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value should be in secs.
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'';
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};
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marginal_path_err_sample_time = mkOption {
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type = nullOr int;
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default = null;
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description = "One of the four parameters of supporting path check based on accounting IO error such as intermittent error";
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};
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marginal_path_err_rate_threshold = mkOption {
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type = nullOr int;
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default = null;
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description = "The error rate threshold as a permillage (1/1000)";
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};
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marginal_path_err_recheck_gap_time = mkOption {
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type = nullOr str;
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default = null;
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description = "One of the four parameters of supporting path check based on accounting IO error such as intermittent error";
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};
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marginal_path_double_failed_time = mkOption {
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type = nullOr str;
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default = null;
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description = "One of the four parameters of supporting path check based on accounting IO error such as intermittent error";
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};
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delay_watch_checks = mkOption {
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type = nullOr str;
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default = null;
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description = "This option is deprecated, and mapped to san_path_err_forget_rate";
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};
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delay_wait_checks = mkOption {
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type = nullOr str;
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default = null;
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description = "This option is deprecated, and mapped to san_path_err_recovery_time";
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};
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skip_kpartx = mkOption {
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type = nullOr (enum [ "yes" "no" ]);
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default = null; # real default: "no"
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description = "If set to yes, kpartx will not automatically create partitions on the device";
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};
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max_sectors_kb = mkOption {
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type = nullOr int;
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default = null;
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description = "Sets the max_sectors_kb device parameter on all path devices and the multipath device to the specified value";
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};
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ghost_delay = mkOption {
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type = nullOr int;
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default = null;
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description = "Sets the number of seconds that multipath will wait after creating a device with only ghost paths before marking it ready for use in systemd";
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};
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all_tg_pt = mkOption {
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type = nullOr str;
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default = null;
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description = "Set the 'all targets ports' flag when registering keys with mpathpersist";
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};
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};
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});
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};
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defaults = mkOption {
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type = nullOr str;
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default = null;
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description = ''
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This section defines default values for attributes which are used
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whenever no values are given in the appropriate device or multipath
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sections.
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'';
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};
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blacklist = mkOption {
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type = nullOr str;
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default = null;
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description = ''
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This section defines which devices should be excluded from the
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multipath topology discovery.
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'';
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};
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blacklist_exceptions = mkOption {
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type = nullOr str;
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default = null;
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description = ''
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This section defines which devices should be included in the
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multipath topology discovery, despite being listed in the
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blacklist section.
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'';
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};
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overrides = mkOption {
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type = nullOr str;
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default = null;
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description = ''
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This section defines values for attributes that should override the
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device-specific settings for all devices.
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'';
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};
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extraConfig = mkOption {
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type = nullOr str;
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default = null;
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description = "Lines to append to default multipath.conf";
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};
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extraConfigFile = mkOption {
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type = nullOr str;
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default = null;
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description = "Append an additional file's contents to /etc/multipath.conf";
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};
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pathGroups = mkOption {
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example = literalExpression ''
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[
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{
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wwid = "360080e500043b35c0123456789abcdef";
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alias = 10001234;
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array = "bigarray.example.com";
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fsType = "zfs"; # optional
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options = "ro"; # optional
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}, ...
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]
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'';
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description = ''
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This option allows you to define multipath groups as described
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in http://christophe.varoqui.free.fr/usage.html.
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'';
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type = listOf (submodule {
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options = {
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alias = mkOption {
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type = int;
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example = 1001234;
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description = "The name of the multipath device";
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};
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wwid = mkOption {
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type = hexStr;
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example = "360080e500043b35c0123456789abcdef";
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description = "The identifier for the multipath device";
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};
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array = mkOption {
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type = str;
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default = null;
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example = "bigarray.example.com";
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description = "The DNS name of the storage array";
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};
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fsType = mkOption {
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type = nullOr str;
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default = null;
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example = "zfs";
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description = "Type of the filesystem";
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};
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options = mkOption {
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type = nullOr str;
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default = null;
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example = "ro";
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description = "Options used to mount the file system";
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};
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};
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});
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};
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};
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config = mkIf cfg.enable {
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environment.etc."multipath.conf".text =
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let
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inherit (cfg) defaults blacklist blacklist_exceptions overrides;
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mkDeviceBlock = cfg: let
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nonNullCfg = lib.filterAttrs (k: v: v != null) cfg;
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attrs = lib.mapAttrsToList (name: value: " ${name} ${toString value}") nonNullCfg;
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in ''
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device {
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${lib.concatStringsSep "\n" attrs}
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}
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'';
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devices = lib.concatMapStringsSep "\n" mkDeviceBlock cfg.devices;
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mkMultipathBlock = m: ''
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multipath {
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wwid ${m.wwid}
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alias ${toString m.alias}
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}
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'';
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multipaths = lib.concatMapStringsSep "\n" mkMultipathBlock cfg.pathGroups;
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in ''
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devices {
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${indentLines 2 devices}
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}
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${optionalString (!isNull defaults) ''
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defaults {
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${indentLines 2 defaults}
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multipath_dir ${cfg.package}/lib/multipath
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}
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''}
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${optionalString (!isNull blacklist) ''
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blacklist {
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${indentLines 2 blacklist}
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}
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''}
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${optionalString (!isNull blacklist_exceptions) ''
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blacklist_exceptions {
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${indentLines 2 blacklist_exceptions}
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}
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''}
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${optionalString (!isNull overrides) ''
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overrides {
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${indentLines 2 overrides}
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}
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''}
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multipaths {
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${indentLines 2 multipaths}
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}
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'';
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systemd.packages = [ cfg.package ];
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environment.systemPackages = [ cfg.package ];
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boot.kernelModules = [ "dm-multipath" "dm-service-time" ];
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# We do not have systemd in stage-1 boot so must invoke `multipathd`
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# with the `-1` argument which disables systemd calls. Invoke `multipath`
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# to display the multipath mappings in the output of `journalctl -b`.
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boot.initrd.kernelModules = [ "dm-multipath" "dm-service-time" ];
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boot.initrd.postDeviceCommands = ''
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modprobe -a dm-multipath dm-service-time
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multipathd -s
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(set -x && sleep 1 && multipath -ll)
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'';
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};
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}
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