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09c0a8fd1a
Previously, ZFS scaled maxinflight_bytes based on total number of disks in the pool. A 3-wide mirror was receiving a queue depth of 3 disks, which it should not, since it reads from all the disks inside. For wide raidz the situation was slightly better, but still a 3-wide raidz1 received a depth of 3 disks instead of 2. The new code counts only unique data disks, i.e. 1 disk for mirrors and non-parity disks for raidz/draid. For draid the math is still imperfect, since vdev_get_nparity() returns number of parity disks per group, not per vdev, but still some better than it was. This should slightly reduce scrub influence on payload for some pool topologies by avoiding excessive queuing. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Ryan Moeller <ryan@iXsystems.com> Signed-off-by: Alexander Motin <mav@FreeBSD.org> Sponsored-By: iXsystems, Inc. Closing #12046 |
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