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linux:fs:zfs:tuning:hdd [2026/03/20 07:25] – created niziaklinux:fs:zfs:tuning:hdd [2026/03/20 07:49] (current) – niziak
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   * SMR drives behaves correctly for sequential writes, but long working ZFS or LVM thin spread writes into lots of random location causing unusable IOPS. So never use SMR.   * SMR drives behaves correctly for sequential writes, but long working ZFS or LVM thin spread writes into lots of random location causing unusable IOPS. So never use SMR.
   * If SMR must be  used try to set ''spa_num_allocators=1'' (default is 4) [[https://openzfs.github.io/openzfs-docs/man/v2.3/4/zfs.4.html#spa_num_allocators|spa_num_allocators]]   * If SMR must be  used try to set ''spa_num_allocators=1'' (default is 4) [[https://openzfs.github.io/openzfs-docs/man/v2.3/4/zfs.4.html#spa_num_allocators|spa_num_allocators]]
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