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@xxxxxxxxxxx> 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 _______________________________________________ Gluster-users mailing list Gluster-users@xxxxxxxxxxx https://lists.gluster.org/mailman/listinfo/gluster-users
