Date: Thu, 21 Nov 2013 11:57:02 +0000 From: Pete French <petefrench@ingresso.co.uk> To: freebsd-stable@freebsd.org Subject: Hast locking up under 9.2 Message-ID: <E1VjSsY-000PXy-GC@dilbert.ingresso.co.uk>
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I have had to (hopefully temprarily) disable hats on our systems as under 9.2 I am finding that it locks up under high disc load. This has only sarted being a problem after we moved from 8-STABLE to 9-STABLE, there was no locking up before. I have a zpool on top of the hast devices - I did have two hast devices, but the problem still occurs with a single device. the symptoms are that I see the 'dirty" count on the master sidetick at 2.0 megs and not change, the number of writes does not change, and if I usse a "sync" command at the command line it never returns - there is no disc activity on eiher the primary or the secondary side. If I leave it like this it will eventually freeze the whole machine, but usually if I see this happening I reboot the stuck machine. This only happens under high levels of disc activity (in this case modifying a mysql table from myisan to inndb - causes a few gig of copies). However it is not simply high disc activity as I can resilver the ZFS pool quite happily without problems. Frustratingly I have a similar setup on a test pair of machines, but I cannot reporduce the problem there. I dont have any useful debugging unfortunately, and I do realise thart "it locks up" is unhelpful! The only thing I see in the syslog are a statements like this: Nov 14 13:51:59 <daemon.err> serpentine-active hastd[1258]: [serp1] (primary) Worker process killed (pid=1520, signal=6). Nov 14 13:51:59 <daemon.err> serpentine-passive hastd[14307]: [serp1] (secondary) Worker process exited ungracefully (pid=14638, exitcode=75). Thats about all the nfo I have - currently I have taken hast out of the stack and am tryying to cobble something together manually using iscsi, but I would prefer to go back to hast if possible. Has anyone seen anythign similar, or have any suggestions ? thanks, -pete.
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