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linux:fs:zfs:tuning:hdd [2026/07/07 16:39] – [bfq] niziaklinux:fs:zfs:tuning:hdd [2026/07/07 19:44] (current) – niziak
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 [[https://github.com/openzfs/zfs/discussions/14916|ZFS Send & RaidZ - Poor performance on HDD #14916]] [[https://github.com/openzfs/zfs/discussions/14916|ZFS Send & RaidZ - Poor performance on HDD #14916]]
 +
 +All ''zfs_vdev'' read/write parameters are for number of parallel requests to one vdev (i.e. for 2x HDD mirror it is for each HDD).
 +So for very slow 2xHDD mirror it is good to limit reads to 2 (2xHDD = 4 parallel reads), and write to 2.
  
 <code bash> <code bash>