On 14-Feb-09, at 2:40 AM, Andras Spitzer wrote:
Damon,
Yes, we can provide simple concat inside the array (even though
today we provide RAID5 or RAID1 as our standard, and using Veritas
with concat), the question is more of if it's worth it to switch
the redundancy from the array to the ZFS layer.
The RAID5/1 features of the high-end EMC arrays also provide
performance improvements, that's why I wonder what would be the
pros/cons of such a switch (I mean the switch of the redundancy
from the array to the ZFS layer).
So, you telling me that even if the SAN provides redundancy (HW
RAID5 or RAID1), people still configure ZFS with either raidz or
mirror?
Without doing so, you don't get the benefit of checksummed self-healing.
--Toby
Regards,
sendai
On Sat, Feb 14, 2009 at 6:06 AM, Damon Atkins
<damon.atk...@_no_spam_yahoo.com.au> wrote:
Andras,
It you can get Concat Disk or Raid 0 Disk inside the array, then
use RaidZ
(if I/O is not large amount or its mostly sequential) if very high
I/O then
use ZFS Mirror. You can not spread a zpool over multiple EMC
Arrays using
SRDF if you are not using EMC Power Path.
HDS for example does not support anything other than Mirror or RAID5
configuration, so RaidZ or ZFS Mirror results in a lot of wasted
disk space.
However people still use RaidZ on HDS Raid5. As the top of the
line HDS
arrays are very fast and they want the features offered by ZFS.
Cheers
--
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