Brian Behlendorf c0aea7cf4e Increase default zfs_scan_vdev_limit to 16MB ... For HDD based pools the default zfs_scan_vdev_limit of 4M per-vdev can significantly limit the maximum scrub performance. Increasing the default to 16M can double the scrub speed from 80 MB/s per disk to 160 MB/s per disk. This does increase the memory footprint during scrub/resilver but given the performance win this is a reasonable trade off. Memory usage is capped at 1/4 of arc_c_max. Note that number of outstanding I/Os has not changed and is still limited by zfs_vdev_scrub_max_active. Reviewed-by: Akash B <akash-b@hpe.com> Reviewed-by: Tony Nguyen <tony.nguyen@delphix.com> Reviewed-by: Alexander Motin <mav@FreeBSD.org> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #14428		2023-01-27 10:01:13 -08:00
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spl.4	Ubuntu 22.04 integration: mancheck	2022-11-18 11:26:41 -08:00
zfs.4	Increase default zfs_scan_vdev_limit to 16MB	2023-01-27 10:01:13 -08:00