Date: Thu, 10 Jan 2013 20:39:49 +0100 From: Nicolas Rachinsky <fbsd-mas-0@ml.turing-complete.org> To: Artem Belevich <art@freebsd.org> Cc: freebsd-fs <freebsd-fs@freebsd.org> Subject: Re: slowdown of zfs (tx->tx) Message-ID: <20130110193949.GA10023@mid.pc5.i.0x5.de> In-Reply-To: <CAFqOu6jrng=v8eVyhqV-PBqJM_dYy%2BU7X4%2B=ahBeoxvK4mxcSA@mail.gmail.com> References: <20130108174225.GA17260@mid.pc5.i.0x5.de> <CAFqOu6jgA8RWV5d%2BrOBk8D=3Vu3yWSnDkAi1cFJ0esj4OpBy2Q@mail.gmail.com> <20130109162613.GA34276@mid.pc5.i.0x5.de> <CAFqOu6jrng=v8eVyhqV-PBqJM_dYy%2BU7X4%2B=ahBeoxvK4mxcSA@mail.gmail.com>
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Hallo, after replacing one of the controllers, all problems seem to have disappeared. Thank you very much for your advice! > >> On Tue, Jan 8, 2013 at 9:42 AM, Nicolas Rachinsky > >> <fbsd-mas-0@ml.turing-complete.org> wrote: * Artem Belevich <art@freebsd.org> [2013-01-09 17:15 -0800]: > On Wed, Jan 9, 2013 at 8:26 AM, Nicolas Rachinsky > <fbsd-mas-0@ml.turing-complete.org> wrote: > > * Artem Belevich <art@freebsd.org> [2013-01-08 12:47 -0800]: > >> You seem to have some checksum errors which does suggest hardware troubles. > > > > I somehow missed these. Is there any way to learn when these checksum > > errors happen? > > Not on FreeBSD (yet) as far as I can tell. Not explicitly, anyways. > Check /var/log/messages for any indications of SATA errors. There's a > good chance that there was a timeout at some point. There is an UDMA_CRC_Error_Count of 17 and 20 for the two disks with checksum errors. The other disks have values between 0 and 5. And yes, there have been timeouts some time ago. Since the problem did occur without the timeout occuring again, I considered the timeouts to be unrelated. And then I forgot them. :( But shouldn't timeouts either produce correct data after a retry or a read/write error otherwise? Nicolas -- http://www.rachinsky.de/nicolas
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