I would like to go back to my question for a second:
I checked with my Nexsan supplier and they confirmed that access to
every single disk in SATABeast is not possible. The smallest entities
I can create on the SATABeast are RAID 0 or 1 arrays. With RAID 1 I'll
loose too much disk space and I believe that leaves me with RAID 0 as
the only reasonable option. But with this unsecure RAID format I'll
need higher redundancy in the ZFS configuration. I think I'll go with
the following configuration:
On the Nexsan SATABeast:
* 14 disks configured in 7 RAID arrays with RAID level 0 (each disk is
1 TB which gives me a total of 14 TB raw disk space).
* Each RAID 0 array configured as one volume.
On the Sun Fire X4100 M2 with Solaris 10:
* Add all 7 volumes to one zpool configured in on raidz2 (gives me
approx. 8,8 TB available disk space)
Any comments or suggestions?
Best regards, Lars-Gunnar Persson
On 11. mars. 2009, at 02.39, Bob Friesenhahn wrote:
On Tue, 10 Mar 2009, A Darren Dunham wrote:
What part isn't true? ZFS has a independent checksum for the data
block. But if the data block is spread over multiple disks, then
each
of the disks have to be read to verify the checksum.
I interpreted what you said to imply that RAID6 type algorithms were
being used to validate the data, rather than to correct wrong data.
I agree that it is necessary to read a full ZFS block in order to
use the ZFS block checksum. I also agree that a raidz2 vdev has
IOPS behavior which is similar to a single disk.
From what I understand, a raidz2 with a very large number of disks
won't use all of the disks to store one ZFS block. There is a
maximum number of disks in a stripe which can be supported by the
ZFS block size.
--
Bob Friesenhahn
bfrie...@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer, http://www.GraphicsMagick.org/
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