> If your pool has few vdevs (I believe you had a single raid-z), then this > will be slow, as you will probably get only about 100 IOP/s from your pool. > My exchange server happily produces 1500 IOP/s in daily use, and would go > higher but our current array wont go any faster for un-cached IO. :-)<p>
How do you check iops?</br> I saw "writes" > 1000 in zpool iostat when I tested pool with sqlio over iscsi.</br> But it was async, of course.</br> I didn't find a way to make sync synthetic writes on windows, so I'm waiting fr exchange to see what kind of writes it makes.</br> <p> >>> 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.<br> >>> <p> >> That's why I'd like to use SSD - to improve iops to a desirable level. <p> > Only if you get a reasonable cache hit rate. I suspect that a combination of > exchange and sql server is likely to result in a fairly poor hit rate - > certainly not enough to alleviate the performance bottleneck of a single vdev. <p> I meant slog - to improve iops for wites. Reading cache is not a big deal right now. --<p> Roman Naumenko</br> [email protected] Message was edited by: rokka -- This message posted from opensolaris.org _______________________________________________ storage-discuss mailing list [email protected] http://mail.opensolaris.org/mailman/listinfo/storage-discuss
