On 5/17/07, Robert Milkowski <[EMAIL PROTECTED]> wrote:
Hello Phillip,
Thursday, May 17, 2007, 6:30:38 PM, you wrote:
PF> [b]Given[/b]: A Solaris 10 u3 server with an externally attached
PF> disk array with RAID controller(s)
PF> [b]Question[/b]: Is it better to create a zpool from a
PF> [u]single[/u] external LUN on an external disk array, or is it
PF> better to use no RAID on the disk array and just present
PF> individual disks to the server and let ZFS take care of the RAID?
Then other thing - do you use SATA disks? How much data loss or
corruption is an issue for you? Doing software RAID in ZFS can detect
AND correct such problems. HW RAID also can but to much less extent.
I think this point needs to be emphasized. If reliability is a prime
concern, you absolutely want to let ZFS handle redundancy in one way
or another, either as mirrogin or as raidz.
You can think of redundancy in ZFS as much the same thing as packet
retransmission in TCP. If the data comes through bad the first time,
checksum verification will catch it, and you get a second chance to
get the correct data. A single-LUN zpool is the moral equivalent of
disabling retransmission in TCP.
Chad Mynhier
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