Date: Fri, 17 Oct 2008 16:09:17 +0200 From: Miroslav Lachman <000.fbsd@quip.cz> To: Jeremy Chadwick <koitsu@FreeBSD.org> Cc: Gavin Atkinson <gavin@FreeBSD.org>, freebsd-stable@FreeBSD.org Subject: Re: Recommendations for servers running SATA drives [hot-swap] Message-ID: <48F89C8D.5020301@quip.cz> In-Reply-To: <20081017120858.GA20746@icarus.home.lan> References: <20080927064417.GA43638@icarus.home.lan> <Pine.OSX.4.64.0809271453550.4630@toasty.nat.fasttrackmonkey.com> <20080927202250.GA60980@icarus.home.lan> <48E0DB7E.20804@quip.cz> <1222699642.24339.12.camel@buffy.york.ac.uk> <48E0F36C.1080400@quip.cz> <20080929153220.GA11459@icarus.home.lan> <48F7964C.4060309@quip.cz> <20081016202322.GA2429@icarus.home.lan> <48F87C0E.8060404@quip.cz> <20081017120858.GA20746@icarus.home.lan>
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Jeremy Chadwick wrote: > On Fri, Oct 17, 2008 at 01:50:38PM +0200, Miroslav Lachman wrote: > >>Jeremy Chadwick wrote: >> >>>On Thu, Oct 16, 2008 at 09:30:20PM +0200, Miroslav Lachman wrote: >>> >>> >>>>Today I was replacing disk in one Sun Fire X2100 M2 so I tried >>>>hot-swapping. It was as you said: atacontrol detach ata3, replace the >>>> HDD, atacontrol attach ata3 and new disk is in the system. I tried >>>>it 3 times to be sure that it was not coincidence - no panic was >>>>produced ;o) >>>>So in this case, hot-swapping on Sun Fire X2100 M2 with FreeBSD 7.0 >>>>i386 works. >>> >>> >>>That's excellent news. So it seems possibly the problem I was seeing >>>was with "reinit" causing some sort of chaos. I'll have to check things >>>on my testbox here at home to see how I caused the panic last time. >>> >>>Thanks for providing feedback, as usual! :-) >> >>Unfortunately there is one problem - I see a lot of interrupts after >>disk swapping (about 193k of atapci1) >> >>Interrupts >>197k total >> ohci0 21 >> ehci0 22 >>193k atapci1 23 >>2001 cpu0: time >> 1 bge1 273 >>2001 cpu1: time > > > Okay, so it looks like the interrupt rate on atapci1 after swapping is > going crazy. What you're showing there looks like heavily modified > vmstat -i output. The shown is manually cropped from systat -vm, I'll try vmstat -i next time. ;) >>Full output of systat -vm 2 is attached. >> >>It is shown in top as 50% interrupt (CPU state) and load 1 until I >>rebooted the machine (I can provide MRTG graphs). The system was not in >>production load, but almost idle. (I will put it in production tomorrow). >>After reboot, everything is OK. > > > And this box is running the ATA patch Andrey provided, yes? It is clean install of FreeBSD 7.0-RELEASE-p5 amd64 without patches. >>Can somebody test hot-swapping with SATA drives and confirm this >>behavior? (I can't test it now, because machine is in datacenter) > > > I can test it on my P4SCE box. > > I'll check the interrupt rates after each step of the hot-swap to see > if/when the problem starts. I'll check the interrupts next time too and will post results to this thread. Miroslav Lachman
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