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zfs: tune hdds pool

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This commit is contained in:
Simon Gardling
2026-03-28 01:21:48 -07:00
parent 84898a1ee7
commit 2409d1b01b
2 changed files with 26 additions and 0 deletions
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11
modules/hardware.nix
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@@ -21,4 +21,15 @@
hardware.cpu.amd.updateMicrocode = true;
hardware.enableRedistributableFirmware = true;
# HDD I/O tuning for torrent seeding workload (high-concurrency random reads).
# mq-deadline sorts requests into elevator sweeps, reducing seek distance.
# Aggressive deadlines (15s) let the scheduler accumulate more ops before dispatching,
# maximizing coalescence — latency is irrelevant since torrent peers tolerate 30-60s.
# fifo_batch=128 keeps sweeps long; writes_starved=16 heavily favors reads.
# 4 MiB readahead matches libtorrent piece extent affinity for sequential prefetch.
services.udev.extraRules = ''
ACTION=="add|change", KERNEL=="sd[a-z]", ATTR{queue/rotational}=="1", ATTR{queue/scheduler}="mq-deadline", ATTR{queue/read_ahead_kb}="4096", ATTR{queue/nr_requests}="512"
ACTION=="add|change", KERNEL=="sd[a-z]", ATTR{queue/rotational}=="1", ENV{ID_ATA_ROTATION_RATE_RPM}!="0", RUN+="${pkgs.bash}/bin/bash -c 'echo 15000 > /sys$devpath/queue/iosched/read_expire; echo 15000 > /sys$devpath/queue/iosched/write_expire; echo 128 > /sys$devpath/queue/iosched/fifo_batch; echo 16 > /sys$devpath/queue/iosched/writes_starved; echo 4096 > /sys$devpath/queue/max_sectors_kb 2>/dev/null || true'"
'';
}