Jason J. W. Williams wrote:
Hello All,
I was curious if anyone had run a benchmark on the IOPS performance of
RAIDZ2 vs RAID-10? I'm getting ready to run one on a Thumper and was
curious what others had seen. Thank you in advance.
I've been using a simple model for small, random reads. In that model,
the performance of a raidz[12] set will be approximately equal to a single
disk. For example, if you have 6 disks, then the performance for the
6-disk raidz2 set will be normalized to 1, and the performance of a 3-way
dynamic stripe of 2-way mirrors will have a normalized performance of 6.
I'd be very interested to see if your results concur.
The models for writes or large reads are much more complicated because
of the numerous caches of varying size and policy throughout the system.
The small, random read workload will be largely unaffected by caches and
you should see the performance as predicted by the disk rpm and seek time.
-- richard
_______________________________________________
zfs-discuss mailing list
zfs-discuss@opensolaris.org
http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
