On Aug 18, 2009, at 10:47 AM, Roman Naumenko <no-
[email protected]> 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,
That config will not handle exchange db well as it will have the max
IOPS of a single disk because raidz/raidz2 has to write the whole
stripe width in each write.
I would seriously re-think your configuration or go with a hardware
RAID solution.
-Ross
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