Date: Fri, 7 Dec 2012 10:21:01 -0800 From: Garrett Cooper <yanegomi@gmail.com> To: Fabian Keil <freebsd-listen@fabiankeil.de> Cc: "freebsd-fs@freebsd.org" <freebsd-fs@freebsd.org> Subject: Re: ZFS hang Message-ID: <79E03100-A019-4579-8762-50FBB82DD356@gmail.com> In-Reply-To: <20121207172240.037306e1@fabiankeil.de> References: <50C1CB34.3000308@icritical.com> <50C1DDE8.9030503@icritical.com> <20121207172240.037306e1@fabiankeil.de>
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On Dec 7, 2012, at 8:22 AM, Fabian Keil <freebsd-listen@fabiankeil.de> wrote: > Matt Burke <mattblists@icritical.com> wrote: > >> Obviously, the cause of my problems would seem to be a hosed disk. However >> the kernel msgbuf shows no complaints from the drive before reboot. >> >> da8 is a 60GB OCZ Agility 3 SSD (purchased prior to realising just how >> unreliable they are). According to the SMART data, it's had just 146GB of >> reads and 278GB writes over 3 power cycles with only 3 months power on >> time, similar to the others that have failed (~60% failure rate for ours) >> >> I can understand the drive failing, I just can't understand how it hung the >> system. I have had a similar thing happen on one of these machines before >> (with GENERIC and no dumpdev, so no debugging) with one of these disks on >> an Areca HBA. > > In CURRENT, parts of the cam layer can silently hang under certain > circumstances and this can negatively affect various other subsystems > including ZFS: > http://lists.freebsd.org/pipermail/freebsd-current/2012-October/037413.html > > I suppose this regression is old enough to have trickled down > to the stable branches by now. > > I'm not saying that this is definitively the problem you are > seeing, but I think it would explain the symptoms. > >> Could there be a problem with ATA devices on SCSI controllers which is >> causing failures to be silently dropped? Is ZFS lacking a timeout on IO calls? > > I believe ZFS is designed with the expectation that timeouts are > handled by the layers below it, so technically it doesn't "lack" > the timeouts for IO calls ... I've noticed hangs on reboot as well recently (in the last 2-3 months) with my ata single disk pools and my mfi pool. All storage disks seem healthy... The pools were running v28 with the zfs features upgrade. Thanks, -Garrett
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