Areca vs. ZFS performance testing.
janm at transactionware.com
Tue Dec 2 03:05:31 PST 2008
Wes Morgan wrote:
> On Sun, 16 Nov 2008, Matt Simerson wrote:
> > The Areca cards do NOT have the cache enabled by default. I
> ordered the
> > optional battery and RAM upgrade for my collection of
> 1231ML cards. Even with
> > the BBWC, the cache is not enabled by default. I had to go
> out of my way to
> > enable it, on every single controller.
> Are you using these areca cards successfully with large
> arrays? I found a
> 1680i card for a decent price and installed it this weekend,
> but since
> then I'm seeing the raidz2 pool that it's running hang so
> frequently that
> I can't even trust using it. The hangs occur in both 7-stable and
> 8-current with the new ZFS patch. Same exact settings that
> have been rock
> solid for me before now don't want to work at all. The drives
> are just set
> as JBOD -- the controller actually defaulted to this, so I
> didn't have to
> make any real changes in the BIOS.
> Any tips on your setup? Did you have any similar problems?
I am seeing I/O related lockups on 7.1-PRE with an Areca ARC-1220 controller
and eight drives in a RAID-6 array. The same hardware works fine with 6.3.
When I run gstat while it is happening I see I/O performance drop and the
time to service each write (ms/w) goes up, and then suddenly goes back down
to a sensible value. I have seen it get to about 22000ms.
The system is essentially unusable for writes, which limits the utility a
bit. Reads seem fine.
Is this similar to the behaviour you saw?
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