On 5/27/14 13:40 , phowell wrote:
Hi
First apologies if this is the wrong place to ask this question.
We are running a small Ceph (0.79) cluster will about 12 osd's which
are on top of a zfs raid 1+0 (for another discussion)... which were
created on this version.
Just a reminder to benchmark everything, especially things you have
known to be true since the dawn of time. I benchmarked RAID10 vs. RAID5
so long ago, I had to find a 3.5" floppy to open the spreadsheet.
Recently, I was testing ZFS on software encrypted volumes, and wanted to
see how badly it would impact a PostgreSQL server. My test setup was
using RAIDZ2, so I just ran the benchmark on that zpool.
Imagine my surprise when an untuned and encrypted RAIDZ2 posted better
benchmarks than a tuned ZFS RAID10.
I really think the "RAID5 is bad for performance" is a nasty hold-over
from when parity calculations needed dedicated hardware. I won't be
building any more ZFS RAID10 arrays.
--
*Craig Lewis*
Senior Systems Engineer
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Email cle...@centraldesktop.com <mailto:cle...@centraldesktop.com>
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