Date: Tue, 2 Dec 2008 21:38:49 +1100 From: "Jan Mikkelsen" <janm@transactionware.com> To: "'Wes Morgan'" <morganw@chemikals.org>, "'Matt Simerson'" <matt@corp.spry.com> Cc: freebsd-fs@freebsd.org, freebsd-hardware@freebsd.org Subject: RE: Areca vs. ZFS performance testing. Message-ID: <C22DCA4BBFD54E3E9FE96197E64B0788@STUDYPC> In-Reply-To: <alpine.BSF.2.00.0811170521320.1488@ibyngvyr.purzvxnyf.bet>
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Hi, Wes Morgan wrote: > On Sun, 16 Nov 2008, Matt Simerson wrote: >=20 > > The Areca cards do NOT have the cache enabled by default. I=20 > ordered the=20 > > optional battery and RAM upgrade for my collection of=20 > 1231ML cards. Even with=20 > > the BBWC, the cache is not enabled by default. I had to go=20 > out of my way to=20 > > enable it, on every single controller. >=20 > Are you using these areca cards successfully with large=20 > arrays? I found a=20 > 1680i card for a decent price and installed it this weekend,=20 > but since=20 > then I'm seeing the raidz2 pool that it's running hang so=20 > frequently that=20 > I can't even trust using it. The hangs occur in both 7-stable and=20 > 8-current with the new ZFS patch. Same exact settings that=20 > have been rock=20 > solid for me before now don't want to work at all. The drives=20 > are just set=20 > as JBOD -- the controller actually defaulted to this, so I=20 > didn't have to=20 > make any real changes in the BIOS. >=20 > 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? Thanks, Jan Mikkelsen
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