On 12/01/2010 23:47, Bob Friesenhahn wrote:
On Tue, 12 Jan 2010, Ed Spencer wrote:
I was wondering how we can tell if the zfs_vdev_max_pending setting
is impeding read performance of the zfs pool? (The pool consists of
lots of small files).
If 'iostat -x' shows that svc_t is quite high, then reducing
zfs_vdev_max_pending might help. The parameter can be adjusted using
the kernel debugger in real time (no reboot or remount) as described
on the zfs tuning page.
Only if actv is close to zfs_vdev_max_pending per each LUN. If it is
close to 0 then changing the vdev_max_pending parameter wouldn't do much
difference.
--
Robert Milkowski
http://milek.blogspot.com
_______________________________________________
zfs-discuss mailing list
zfs-discuss@opensolaris.org
http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
