> > > Can anybody confirm that random read performance is definitely > > better with mirrored volumes. Does ZFS use all the disks in the > > mirror sets independently when reading data? Am I right in thinking > > I could have around 7x better random read performance with the 15 > > mirrored drives, when compared to the two raid-z2 volumes? > > Yes. two caveats though. ZFS is a COW filesystem, currently with no > defrag. Placing heavy write (vmware is) on this type of storage > (especially, but not only if you are planning on using snapshots) you will > tend to see diminishing performance over time. Do not allow the ZFS > partition to become over 80% full -- performance hits a wall hard with the > kind of write profile you are going to expect with vmware as zfs looks for > free blocks. >
It there a move anytime soon to implement a defragmenter? Matthew
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