On Tue, 2 Dec 2008, Jan Mikkelsen wrote:
Hi,
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?
Not quite. The zfs deadlock/hang effected both reads and writes, blocking
either of them indefinitely. They were "fixed" by the most recent set of
patches in -current.
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