On Thu, 2006-09-28 at 10:51 -0700, Richard Elling - PAE wrote: > Keith Clay wrote: > > We are in the process of purchasing new san/s that our mail server runs > > on (JES3). We have moved our mailstores to zfs and continue to have > > checksum errors -- they are corrected but this improves on the ufs inode > > errors that require system shutdown and fsck. > > > > So, I am recommending that we buy small jbods, do raidz2 and let zfs > > handle the raiding of these boxes. As we need more storage, we can add > > boxes and place them in a pool. This would allow more controllers and > > move spindles which I would think would add reliability and > > performance. I am thinking SATA II drives. > > > > Any recommendations and/or advice is welcome. >
Also, I can't remember how JES3 does its mailstore, but lots of little writes to a RAIDZ volume aren't good for performance, even through ZFS is better about waiting for sufficient write data to do a full-stripe-width write (vs. RAID-5). That is, using RAIDZ on SATA isn't a good performance idea for the small write usage pattern, so I'd be careful and get a demo unit first to check out the actual numbers. -- Erik Trimble Java System Support Mailstop: usca14-102 Phone: x17195 Santa Clara, CA Timezone: US/Pacific (GMT-0800) _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
