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ap60@xxxxxxxxxxxxx said:
> I'm curious about your array configuration above... did you create your
> RAIDZ2 as one vdev or multiple vdev's? If multiple, how many? On mine, I
> have all 10 disks set up as one RAIDZ2 vdev which is supposed to be near the
> performance limit... I'm wondering how much I would gain by splitting it into
> two vdev's for the price of losing 1.5TB (2 disks) worth of storage.
You've probably already seen/heard this, but I haven't seen it mentioned
in this thread. The consensus is, and measurements seem to confirm, that
splitting it into two vdev's will double your available IOPS for small,
random read loads on raidz/raidz2. Here are some references and examples:
http://blogs.sun.com/roch/entry/when_to_and_not_to
http://blogs.sun.com/relling/entry/zfs_raid_recommendations_space_performance
http://blogs.sun.com/relling/entry/zfs_raid_recommendations_space_performance1
http://acc.ohsu.edu/~hakansom/thumper_bench.html
Regards,
Marion
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