Date: Wed, 9 Jan 2013 17:26:13 +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: <20130109162613.GA34276@mid.pc5.i.0x5.de> In-Reply-To: <CAFqOu6jgA8RWV5d%2BrOBk8D=3Vu3yWSnDkAi1cFJ0esj4OpBy2Q@mail.gmail.com> References: <20130108174225.GA17260@mid.pc5.i.0x5.de> <CAFqOu6jgA8RWV5d%2BrOBk8D=3Vu3yWSnDkAi1cFJ0esj4OpBy2Q@mail.gmail.com>
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* Artem Belevich <art@freebsd.org> [2013-01-08 12:47 -0800]: > On Tue, Jan 8, 2013 at 9:42 AM, Nicolas Rachinsky > <fbsd-mas-0@ml.turing-complete.org> wrote: > > NAME STATE READ WRITE CKSUM > > pool1 DEGRADED 0 0 0 > > raidz2-0 DEGRADED 0 0 0 > > ada5 ONLINE 0 0 0 > > ada8 ONLINE 0 0 0 > > ada2 ONLINE 0 0 0 > > ada3 ONLINE 0 0 0 > > 11846390416703086268 UNAVAIL 0 0 0 was /dev/dsk/ada1 > > ada6 ONLINE 0 0 0 > > ada0 ONLINE 0 0 1 > > ada7 ONLINE 0 0 0 > > ada4 ONLINE 0 0 3 > > 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? > For starters, check smart info for all drives and see if they have any > relocated sectors. There are some disks with relocated sectors, but for both ada0 and ada4 Reallocated_Sector_Ct is 0. > Use gstat during your workload to see if any of the drives takes much > longer than others to handle its job. There is one disk sticking out a bit. > > There is almost no disk activity during this time. > > What kind of disk activity *is* there? What would be interesting? > > sync is disabled for the whole pool. > > If that's the case (assyming you're talking about sync=disabled zfs > property), then synchronous writes are probably not the cause of > slowdown. My guess would be either failing HDD or something funky with > cabling or sata controller. Yes, sync=disabled for pool1. Ok, I will start swapping hardware (sadly the machine is quite a drive away). Thank you very much for your help. Nicolas -- http://www.rachinsky.de/nicolas
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