Bron Gondwana wrote: > Try a 2.6.20 kernel, just for an interesting datapoint. We changed > back to 2.6.20 (64 bit still) and haven't seen a corrupted seen file > since. I hope to try that still today. I'm now running on 2.6.24-2, 32bit. I have cleaned up the users that were having a corrupted mailbox on replica. Surprisingly I can count them on both hands. So now I'm again running with rolling replication and I'm doing a sync_client session for each user. When that is finnished I'll try to downgrade the kernel. Btw, I tested my sarge-> etch upgrade in a xen virtual machine, 64bit kernel + 32 bit userspace. But this was 2.6.18. I'm still wondering if I should run 2.6.20 in 32bit or 64bit... >>> Oh - can you tell me. Did the file checkpoint sometime not too long before it >>> got corrupted? >> The cases I saw it did. > > Ditto here. Interesting. They also had quite long records, but > I don't know how common that is. Lots of little bits of seen > spread around the space. I'm not sure how I would see that? I'm not familiar with the internals of skiplist. >>> I've got a small set of theories, but I'm reading the skiplist source code >>> (again!) to see if they make sense... >>> >>> Bron. >> I'm also wondering if what would happen if I brought up a master. Surely >> the imap processes would also segfault. Right? > > If it was on those corrupted files, yes. On that machine - quite > probably. If you can afford the hardware it may be worth testing. > > (hmm, I can possibly dedicate a 64 bit capable machine to testing > this. If it's a kernel bug I'd love to reproduce it) > >> Here I can delete the mailbox on the replica and sync again. As a >> reconstruct doesn't help. > > We find reconstructing helps now - but that's with the 2.6.20 > kernel. There were multiple things going wrong before. We > originally suspected the external drive unit was playing up, > but I'm thinking kernel now. Thanks very much for you input! -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- Rudy Gevaert Rudy.Gevaert@xxxxxxxx tel:+32 9 264 4734 Directie ICT, afd. Infrastructuur ICT Department, Infrastructure office Groep Systemen Systems group Universiteit Gent Ghent University Krijgslaan 281, gebouw S9, 9000 Gent, Belgie www.UGent.be -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- ---- Cyrus Home Page: http://cyrusimap.web.cmu.edu/ Cyrus Wiki/FAQ: http://cyrusimap.web.cmu.edu/twiki List Archives/Info: http://asg.web.cmu.edu/cyrus/mailing-list.html
