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nixos/zfs: Added a randomizedDelaySec option to ZFS autoscrub/trim timers

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Allows operators to space out these IO operations across a fleet of
machines, rather than have them all happen at the same time.
This commit is contained in:
Jonathan Davies 2024-02-09 15:03:47 +00:00
parent b3741ce0ae
commit 8e0e9bdee8
1 changed files with 29 additions and 1 deletions
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30
nixos/modules/tasks/filesystems/zfs.nix
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@ -441,6 +441,18 @@ in
{manpage}`systemd.time(7)`.
'';
};
randomizedDelaySec = mkOption {
default = "6h";
type = types.str;
example = "12h";
description = ''
Add a randomized delay before each ZFS trim.
The delay will be chosen between zero and this value.
This value must be a time span in the format specified by
{manpage}`systemd.time(7)`
'';
};
};
services.zfs.autoScrub = {
@ -456,6 +468,18 @@ in
'';
};
randomizedDelaySec = mkOption {
default = "6h";
type = types.str;
example = "12h";
description = ''
Add a randomized delay before each ZFS autoscrub.
The delay will be chosen between zero and this value.
This value must be a time span in the format specified by
{manpage}`systemd.time(7)`
'';
};
pools = mkOption {
default = [];
type = types.listOf types.str;
@ -862,6 +886,7 @@ in
timerConfig = {
OnCalendar = cfgScrub.interval;
Persistent = "yes";
RandomizedDelaySec = cfgScrub.randomizedDelaySec;
};
};
})
@ -879,7 +904,10 @@ in
serviceConfig.ExecStart = "${pkgs.runtimeShell} -c 'for pool in $(zpool list -H -o name); do zpool trim $pool; done || true' ";
};
systemd.timers.zpool-trim.timerConfig.Persistent = "yes";
systemd.timers.zpool-trim.timerConfig = {
Persistent = "yes";
RandomizedDelaySec = cfgTrim.randomizedDelaySec;
};
})
];
}