On Dec 24, 2009, at 5:34 PM, Freddie Cash wrote:
Mattias Pantzare wrote:
That would leave us with three options;
1) Deal with it and accept performance as it is.
2) Find a way to speed things up further for this
workload
3) Stop trying to use ZFS for this workload
Option 4 is to re-do your pool, using fewer disks per raidz2 vdev,
giving more vdevs to the pool, and thus increasing the IOps for the
whole pool.
14 disks in a single raidz2 vdev is going to give horrible IO,
regardless of how fast the individual disks are.
Redoing it with 6-disk raidz2 vdevs, or even 8-drive raidz2 vdevs
will give you much better throughput.
At this point it is useful to know that if you do not have a
separate log, then the ZIL uses the pool and its data protection
scheme. In other words, each ZIL write will be a raidz2 stripe
with its associated performance.
-- richard
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