[ovirt-users] Re: VM disk corruption with LSM on Gluster

Hi, I can confirm that after setting these two options, I haven't encountered disk corruptions anymore. The downside, is that at least for me it had a pretty big impact on performance. The iops really went down - performing inside vm fio tests. On Wed, Mar 27, 2019, 07:03 Krutika Dhananjay <kdhananj(a)redhat.com&gt; wrote: > Could you enable strict-o-direct and disable remote-dio on the src volume > as well, restart the vms on "old" and retry migration? > > # gluster volume set <VOLNAME> performance.strict-o-direct on > # gluster volume set <VOLNAME> network.remote-dio off > > -Krutika > > On Tue, Mar 26, 2019 at 10:32 PM Sander Hoentjen <sander(a)hoentjen.eu&gt; > wrote: > >> On 26-03-19 14:23, Sahina Bose wrote: >> > +Krutika Dhananjay and gluster ml >> > >> > On Tue, Mar 26, 2019 at 6:16 PM Sander Hoentjen <sander(a)hoentjen.eu&gt; >> wrote: >> >> Hello, >> >> >> >> tl;dr We have disk corruption when doing live storage migration on >> oVirt >> >> 4.2 with gluster 3.12.15. Any idea why? >> >> >> >> We have a 3-node oVirt cluster that is both compute and >> gluster-storage. >> >> The manager runs on separate hardware. We are running out of space on >> >> this volume, so we added another Gluster volume that is bigger, put a >> >> storage domain on it and then we migrated VM's to it with LSM. After >> >> some time, we noticed that (some of) the migrated VM's had corrupted >> >> filesystems. After moving everything back with export-import to the >> old >> >> domain where possible, and recovering from backups where needed we set >> >> off to investigate this issue. >> >> >> >> We are now at the point where we can reproduce this issue within a >> day. >> >> What we have found so far: >> >> 1) The corruption occurs at the very end of the replication step, most >> >> probably between START and FINISH of diskReplicateFinish, before the >> >> START merge step >> >> 2) In the corrupted VM, at some place where data should be, this data >> is >> >> replaced by zero's. This can be file-contents or a directory-structure >> >> or whatever. >> >> 3) The source gluster volume has different settings then the >> destination >> >> (Mostly because the defaults were different at creation time): >> >> >> >> Setting old(src) new(dst) >> >> cluster.op-version 30800 30800 (the same) >> >> cluster.max-op-version 31202 31202 (the same) >> >> cluster.metadata-self-heal off on >> >> cluster.data-self-heal off on >> >> cluster.entry-self-heal off on >> >> performance.low-prio-threads 16 32 >> >> performance.strict-o-direct off on >> >> network.ping-timeout 42 30 >> >> network.remote-dio enable off >> >> transport.address-family - inet >> >> performance.stat-prefetch off on >> >> features.shard-block-size 512MB 64MB >> >> cluster.shd-max-threads 1 8 >> >> cluster.shd-wait-qlength 1024 10000 >> >> cluster.locking-scheme full granular >> >> cluster.granular-entry-heal no enable >> >> >> >> 4) To test, we migrate some VM's back and forth. The corruption does >> not >> >> occur every time. To this point it only occurs from old to new, but we >> >> don't have enough data-points to be sure about that. >> >> >> >> Anybody an idea what is causing the corruption? Is this the best list >> to >> >> ask, or should I ask on a Gluster list? I am not sure if this is oVirt >> >> specific or Gluster specific though. >> > Do you have logs from old and new gluster volumes? Any errors in the >> > new volume's fuse mount logs? >> >> Around the time of corruption I see the message: >> The message "I [MSGID: 133017] [shard.c:4941:shard_seek] >> 0-ZoneA_Gluster1-shard: seek called on >> 7fabc273-3d8a-4a49-8906-b8ccbea4a49f. [Operation not supported]" repeated >> 231 times between [2019-03-26 13:14:22.297333] and [2019-03-26 >> 13:15:42.912170] >> >> I also see this message at other times, when I don't see the corruption >> occur, though. >> >> -- >> Sander >> _______________________________________________ >> Users mailing list -- users(a)ovirt.org >> To unsubscribe send an email to users-leave(a)ovirt.org >> Privacy Statement: https://www.ovirt.org/site/privacy-policy/ >> oVirt Code of Conduct: >> https://www.ovirt.org/community/about/community-guidelines/ >> List Archives: >> https://lists.ovirt.org/archives/list/users@ovirt.org/message/M3T2VGGGV6D... >> > _______________________________________________ > Users mailing list -- users(a)ovirt.org > To unsubscribe send an email to users-leave(a)ovirt.org > Privacy Statement: https://www.ovirt.org/site/privacy-policy/ > oVirt Code of Conduct: > https://www.ovirt.org/community/about/community-guidelines/ > List Archives: > https://lists.ovirt.org/archives/list/users@ovirt.org/message/ZUIRM5PT4Y4... >