http://192.168.180.206:8001/ 2026-05-12T23:33:03+00:00 http://192.168.180.206:8001/ http://192.168.180.206:8001/_media/wiki:dokuwiki.svg text/html 2026-03-20T06:49:29+00:00 Anonymous (anonymous@undisclosed.example.com) http://192.168.180.206:8001/linux:fs:zfs:tuning:hdd?rev=1773989369&do=diff HDD ZFS Send & RaidZ - Poor performance on HDD #14916 cat /sys/module/zfs/parameters/zfs_vdev_async_write_max_active echo 2 > /sys/module/zfs/parameters/zfs_vdev_async_write_max_active cat /sys/module/zfs/parameters/zfs_vdev_async_write_max_active Use huge record size - it can help on SMR drives. Note: it only make sense for ZFS file system. Cannot be applied on ZVOL. text/html 2026-03-20T06:15:32+00:00 Anonymous (anonymous@undisclosed.example.com) http://192.168.180.206:8001/linux:fs:zfs:tuning:iosched?rev=1773987332&do=diff IO scheduler If whole device is managed by ZFS (not partition), ZFS sets scheduler to none. official recommendation For rotational devices, there is no sense to use advanced schedulers cfq or bfq directly on hard disc. Both depends on processes, processes groups and application. In this case there is group of kernel processess for ZFS. text/html 2025-02-07T19:24:03+00:00 Anonymous (anonymous@undisclosed.example.com) http://192.168.180.206:8001/linux:fs:zfs:tuning:l2arc?rev=1738956243&do=diff ZFS "ARC" is getting smarter with version 2.2+