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linux:fs:zfs:tuning [2025/03/04 16:12] – niziaklinux:fs:zfs:tuning [2025/08/23 08:45] (current) – niziak
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 ====== ZFS performance tuning tips ====== ====== ZFS performance tuning tips ======
 +
 +Copy-paste snippet:
 +<code bash>
 +zfs set recordsize=1M hddpool
 +zfs set recordsize=1M nvmpool
 +zfs set compression=zstd hddpool
 +zfs set compression=zstd nvmpool
 +</code>
  
 ===== zil limit ===== ===== zil limit =====
  
 ZFS parameter [[https://openzfs.github.io/openzfs-docs/Performance%20and%20Tuning/Module%20Parameters.html#zil-slog-bulk|zil_slog_bulk]] is responsible to ''throttle'' LOG device load. In older ZFS valu was set to 768kB, currently it is 64MB. All sync write requests above this size will be treated as async requests and written directly to slower main device. ZFS parameter [[https://openzfs.github.io/openzfs-docs/Performance%20and%20Tuning/Module%20Parameters.html#zil-slog-bulk|zil_slog_bulk]] is responsible to ''throttle'' LOG device load. In older ZFS valu was set to 768kB, currently it is 64MB. All sync write requests above this size will be treated as async requests and written directly to slower main device.
 +
 +<file ini /etc/modprobe.d/zfs.conf>
 +options zfs zil_slog_bulk=67108864
 +options zfs l2arc_write_max=67108864
 +</file>
  
 See similar for L2ARC: [[https://openzfs.github.io/openzfs-docs/Performance%20and%20Tuning/Module%20Parameters.html#l2arc-write-max|l2arc_write_max]] See similar for L2ARC: [[https://openzfs.github.io/openzfs-docs/Performance%20and%20Tuning/Module%20Parameters.html#l2arc-write-max|l2arc_write_max]]