ZFS based mirroring is only slightly less reliable than Raid-z2, and it
gives much better IOP/s.
Neither exchange or SQL Server tend to be throughput bound, but both
require very high IOP/s rates. I don't think you'll see enough traffic
accross the controller for it to be the bottleneck!
Even with a dedicated SAN and 15K/rpm drives, MS generally recommend
Raid-10 configurations for exchange. Raid-5/6, or RaidZ1/2 usually
doesn't give the IOP/s rates you need - although many people do anyway.
How many users are there on your exchange server? I have a suspicion
that even if you move to zfs mirroring, you still might not get enough
performance for exchange with that number of drives - especially if
you're putting other load on the system.
Regards,
Tristan.
Roman Naumenko wrote:
Using mirrors just makes zfs useless. The whole idea
is a reliable raid6 storage with snapshots
features.<br>
The question is how prevent saturation for one
volume.</blockquote><div>
<br>What is your current
zpool format (raidz, raidz2, etc)? Using a mirror
does not make zfs useless - you can still use all of
the built-in features of the software. Mirroring your
drives just makes it a raid1 instead of raid6.<br>
raidz2 array of 8 disks, 2Xquade core, 16G
Yes, it's possible to configure it as 4x2 mirrors with capacity almost 2 time
less, with reliability also degraded. But since they on the same controller,
performance of one pool might be dependent on access to another.
--
Roman
_______________________________________________
storage-discuss mailing list
[email protected]
http://mail.opensolaris.org/mailman/listinfo/storage-discuss
