Hi Chris,
If you have 40 or so disks then you would create 5-6 RAIDZ virtual
devices of 7-8 disks each, or possibly include two disks for the root
pool, two disks as spares, and then 36 (4 RAIDZ vdevs of 6 disks) disks
for a non-root pool.
This configuration guide hasn't been updated for RAIDZ-3 yet, but you
will get some ideas about how to configure a redundant configuration
of many disks, here:
http://www.solarisinternals.com/wiki/index.php/ZFS_Configuration_Guide
See ZFS Configuration Example (x4500 with raidz2)
Cindy
On 12/01/09 09:20, Christopher White wrote:
All,
We're going to start testing ZFS and I had a question about Top Level
Devices (TLDs). In Sun's class, they specifically said not to use more
than 9 TLDs due to performance concerns. Our storage admins make LUNs
roughly 15G in size -- so how would we make a large pool (1TB) if we're
limited to only 9 TLDs?
The Best Practices guide (
http://www.solarisinternals.com/wiki/index.php/ZFS_Best_Practices_Guide#Storage_Pool_Performance_Considerations
) suggests not using 40+ disks in a RAIDZ TLD:
"Avoid creating a RAIDZ, RAIDZ-2, RAIDZ-3, or a mirrored configuration
with one logical device of 40+ devices. See the sections below for
examples of redundant configurations."
Does that mean we should only have 9 RAIDZ TLDs with 39 LUNs in each RAIDZ?
Or is the 9 TLDs an old recommendation that has since been changed?
Thanks!
Chris
------------------------------------------------------------------------
_______________________________________________
zfs-discuss mailing list
zfs-discuss@opensolaris.org
http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
_______________________________________________
zfs-discuss mailing list
zfs-discuss@opensolaris.org
http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
