ZFS resilvering strangles IO
Bob Friesenhahn
bfriesen at simple.dallas.tx.us
Tue May 8 21:31:30 UTC 2012
On Tue, 8 May 2012, Michael Gmelin wrote:
>
> Do you think it would make sense to try to play with zfs_resilver_delay directly in the ZFS kernel module?
This may be the wrong approach if the issue is really that there are
too many I/Os queued for the device. Finding a tunable which reduces
the maximum number of I/Os queued for a disk device may help reduce
write latencies by limiting the backlog.
On my Solaris 10 system, I accomplished this via a tunable in
/etc/system:
set zfs:zfs_vdev_max_pending = 5
What is the equivalent for FreeBSD?
Bob
--
Bob Friesenhahn
bfriesen at simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer, http://www.GraphicsMagick.org/
More information about the freebsd-fs
mailing list