On Fri, Aug 27, 2010 at 01:22:15PM -0700, John wrote: > Wouldn't it be possible to saturate the SSD ZIL with enough > backlogged sync writes? > > What I mean is, doesn't the ZIL eventually need to make it to the > pool, and if the pool as a whole (spinning disks) can't keep up with > 30+ vm's of write requests, couldn't you fill up the ZIL that way?
Depends on the workload of course, but we have 50+ VM server environments running off of 22x1TB SATA + 32GB Intel X25-E SSD's with no problems whatsoever. I don't have the zilstat numbers handy, but we're not pushing enough I/O for the slog device to even come close to sweating. Note that our VM's are in a LabManager environment and can spun up and down to do compiles mostly, not pushing huge amounts of non-random I/O. Ray _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
