On Thu, Jan 14, 2010 at 03:55:20PM -0800, Ray Van Dolson wrote: > On Thu, Jan 14, 2010 at 03:41:17PM -0800, Richard Elling wrote: > > > Consider a pool of 3x 2TB SATA disks in RAIZ1, you would roughly > > > have 80 IOPS. Any info about the relation between ZIL <> pool > > > performance? Or will the ZIL simply fill up and performance drops > > > to pool speed? > > > > The ZFS write performance for this configuration should consistently > > be greater than 80 IOPS. We've seen measurements in the 600 write > > IOPS range. Why? Because ZFS writes tend to be contiguous. Also, > > with the SATA disk write cache enabled, bursts of writes are handled > > quite nicely. > > -- richard > > That's interesting. I was under the impression that your IOPS for a > zpool were limited to the slowest drive in a vdev -- times the number > of vdevs. >
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