36 lines
1.1 KiB
Nix
36 lines
1.1 KiB
Nix
{ config, lib, ... }:
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with lib;
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{
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# if lvm is enabled, then tell it to issue discards
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# (this is good for SSDs and has almost no downsides on HDDs, so
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# it's a good idea to enable it unconditionally)
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environment.etc."lvm/lvm.conf".text = mkIf config.services.lvm.enable ''
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devices {
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issue_discards = 1
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}
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'';
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# discard blocks that are not in use by the filesystem, good for SSDs
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services.fstrim = {
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# we may enable this unconditionally across all systems becuase it's performance
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# impact is negligible on systems without a SSD - which means it's a no-op with
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# almost no downsides aside from the service firing once per week
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enable = true;
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# the default value, good enough for average-load systems
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interval = "weekly";
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};
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# tweak fstim service to run only when on AC power
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# and to be nice to other processes
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# (this is a good idea for any service that runs periodically)
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systemd.services.fstrim = {
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unitConfig.ConditionACPower = true;
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serviceConfig = {
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Nice = 19;
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IOSchedulingClass = "idle";
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};
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};
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} |