#ceph IRC Log

Index

IRC Log for 2013-02-23

Timestamps are in GMT/BST.

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[0:06] <dmick> mjevans: the last time I had such perplexing errors it was because of '\r' at EOL
[0:06] <dmick> I pushed a fix, but I don't recall where it went
[0:07] <dmick> but yes, that parser's error reporting is terrible
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[17:05] <solarian> hello
[17:05] <solarian> i am setting up the metadata service for my existing ceph cluster
[17:06] <solarian> however as soon as an mds instance starts up and becomes available, it crashes
[17:07] <solarian> http://pastebin.com/mUDqF287
[17:07] <solarian> this is the crashdump
[17:07] <solarian> i have tried it with ubuntu 12.04 and 12.10 aswell
[17:07] <solarian> same story
[17:07] <solarian> do you guys have any idea about this? :)
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[17:42] <sage> solarian: there is a patch in master that I believe fixes this.
[17:42] <sage> e51299fbce6bdc3d6ec736e949ba8643afc965ec
[17:42] <sage> actually it's in v0.57 too.
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[17:44] <solarian> sage: great, i give it a try
[17:50] <solarian> sage: yes it works like charm, thank you!
[17:56] <sage> great!
[17:56] <sage> np
[18:09] <solarian> have a nice weekend, byby
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[22:38] * loicd lisenting http://mirror.linux.org.au/linux.conf.au/2013/ogv/Ceph_object_storage_block_storage_file_system_replication_massive_scalability_and_then_some.ogv
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[22:56] <loicd> s/lisenting/listening/....
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[23:41] <lightspeed> deep scrub has identified two inconsistent objects in my cluster (both are due to mismatching digests)
[23:41] <lightspeed> curiously, the exact same objects have both had inconsistencies in the past, which I "repaired" at the time
[23:42] <lightspeed> and in at least one of these cases, I'm certain there have been no writes to the object since then
[23:42] <lightspeed> yet another inconsistency has since arisen
[23:43] <lightspeed> (both of these objects are part of the same RBD VM image, and the VM has been powered off in the meantime
[23:43] <lightspeed> so I'm trying to figure out what's going on
[23:43] <lightspeed> here are the relevant log entries:
[23:44] <lightspeed> http://pastebin.com/Hiy5NjVY
[23:45] <lightspeed> I'm certain that RBD image has not been written to since at least Feb 12th (possibly earlier)
[23:47] <lightspeed> I've also investigated the latest occurrence for the inconsistent object in pg 2.31 in more detail, by comparing the data inside the two versions of the object
[23:48] <lightspeed> there is a 1kB block of data present somewhere in the middle of one of them which is absent from the other (but otherwise they are identical)
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[23:58] <lightspeed> the logs suggest that in the case of the most recent inconsistency in pg 2.1a the "known digest" is actually the incorrect one, based on the fact that the other digest value matches the value it was set to by the preceding repair operation
[23:59] <jmlowe> lightspeed: btrfs backing your osd's?
[23:59] <lightspeed> is the "known digest" value recorded somewhere, or is just the value taken from the primary copy of the object (whether that's correct or not)?
[23:59] <jmlowe> the primary is always the know digest and size
[23:59] <jmlowe> repair always selects the primary, wrong or right

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