On Wed, Feb 11, 2009 at 2:13 PM, Greg Mason <gma...@msu.edu> wrote: > We're using some X4540s, with OpenSolaris 2008.11. > > According to my testing, to optimize our systems for our specific workload, > I've determined that we get the best performance with the write cache > disabled on every disk, and with zfs:zfs_nocacheflush=1 set in /etc/system. > > The only issue is setting the write cache permanently, or at least quickly. > > Right now, as it is, I've scripted up format to run on boot, disabling the > write cache of all disks. This takes around two minutes. I'd like to avoid > needing to take this time on every bootup (which is more often than you'd > think, we've got quite a bit of construction happening, which necessitates > bringing everything down periodically). This would also be painful in the > event of unplanned downtime for one of our Thors. > > so, basically, my question is: Is there a way to quickly or permanently > disable the write cache on every disk in an X4540? > > Thanks, > > -Greg > _______________________________________________ > zfs-discuss mailing list > zfs-discuss@opensolaris.org > http://mail.opensolaris.org/mailman/listinfo/zfs-discuss >
We use several X4540's over here as well, what type of workload do you have, and how much performance increase did you see by disabling the write caches? -- Brent Jones br...@servuhome.net _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
