On 7/21/2010 2:38 PM, Cindy Swearingen wrote:
The answer depends on your goals: space, performance, reliability
To me, optimal is best performance and reliability so use:
- JBOD
- ZFS mirrored pool of 22x2 + 2 spares
- Mirror the disk pairs across both controllers
Let ZFS protect your data.
Cindy
On 07/21/10 15:10, John Andrunas wrote:
I know this is potentially a loaded question, but what is generally
considered the optimal disk configuration for ZFS. I have 48 disks on
2 RAID controllers (2x24). The RAID controller can do RAID
0/1/5/6/10/50/60 or JBOD. What is generally considered the optimal
configuration for the disks. JBOD, RAID zvols on both controllers.
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As Cindy said. Also, consider that you don't need to put everything
into a single disk pool, so if you have different requirements for
different data, remember you can break your disks into different
configurations in different pools. And, of course, balance members of
pools across the two controllers.
For example: I need both performance for home directories, and lots of
space for backups, so I'd go with:
zpool1: 8-disk mirrored setup (4x2)
zpool2: 2 x 7-disk RAIDZ2 (I get slightly paranoid, so if you are
less so, you could do RAIDZ1)
hot spares: 2
Result: 4-disk-space's worth of high-performance, 10 disk-space's worth
of just storage.
Oh, and just ignore the RAID controller's configuration. Enable the
NVRAM cache on the controllers, but otherwise, run the disks as either
JBOD (if the controller allows use of the NVRAM for a JBOD config), or a
1-disk stripes (if it requires arrays to use the NVRAM).
--
Erik Trimble
Java System Support
Mailstop: usca22-123
Phone: x17195
Santa Clara, CA
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