#ceph IRC Log

Index

IRC Log for 2012-01-16

Timestamps are in GMT/BST.

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[10:21] <Lo-lan-do> Hi all
[10:23] <Lo-lan-do> I'm looking for a distributed filesystem; I did a write-up of what I've found so far, and I'd welcome corrections and feedback.
[10:23] <Lo-lan-do> http://roland.entierement.nu/blog/2012/01/15/looking-for-the-ultimate-distributed-filesystem.html for the post
[10:23] <Lo-lan-do> (I already got feedback from a Tahoe-LAFS dev)
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[12:25] <Kioob`Taff1> hi
[12:26] <Kioob`Taff1> I have a file corruption problem, and I suppose it's because of ceph. Is there a way to debug that ?
[12:27] <Kioob`Taff1> Maybe I can check all copies of the file made by Ceph ?
[12:28] <Kioob`Taff1> when I read some of my files (with less or nano for example), I see only a lot of : ^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@
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[14:40] <otherone> on friday I was given email for Dona, however I didn't copy it, can someone give it to me once more ?
[14:56] <otherone> I found the email address :-)
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[15:41] <lxo> whom can I thank for cluster_snap? just came across it, and loved it
[16:04] <lxo> interesting. I think I found out a way to cause timestamp changes of directories within existing snapshots. it goes something like ls -ld .; mkdir .snap/name; touch .; mds restart; remount
[16:07] <lxo> I've also found out dir layouts are lost without restarting the mds: after lots of changes within a directory with a certain layout, many other dirs that were not touched at all lose their layouts. I've also seen different mounts show different layout info (some dirs with info on one mount and without it on the other)
[16:07] <lxo> this was all noticed before upgrading to 0.40, but already observed with 0.40 as well
[16:08] <lxo> BTW, lots of changes = rsyncing a tree with several thousand files into the ceph filesystem
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[17:32] <guido> ah, why are the dreamhost nameservers so patchy? Half of the time, I cannot even access ceph.newdream.net (and some other domains on the same nameservers)
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[20:18] <chaos_> hello
[20:19] <chaos_> i've just upgraded ceph to 0.40 and.. osd fails to start, http://wklej.org/id/670633/
[20:23] <chaos_> ok i see that someone reported such issie
[20:23] <chaos_> issue*
[20:24] <chaos_> sage, any luck with http://comments.gmane.org/gmane.comp.file-systems.ceph.devel/4945 ?
[20:43] <chaos_> and now can't downgrade to 0.39...
[20:43] <chaos_> gr8 ;p
[20:48] <chaos_> sagewk1?
[20:48] <sagewk1> chaos_: hey
[20:49] <sagewk1> can you pastebin a ceph osd dump ?
[20:49] <chaos_> with debug 10?
[20:50] <sagewk1> just the osdmap itself, no debug
[20:50] <chaos_> k
[20:50] <chaos_> in a sec
[20:51] <sagewk1> commit a4642946b284c0b0fd85587e0c0b0bbf0ec4b0b4 will report an error instead of crashing, so dont worry about needing to downgrade.
[20:51] <sagewk1> lets see if we can figure out where the bad address came from tho..
[20:52] <chaos_> http://ch4os.gen2.org/osdmap
[20:52] <chaos_> so i can safely build a4642946b284c0b0fd85587e0c0b0bbf0ec4b0b4?
[20:53] <sagewk1> hmm, let me cherry-pick that into hte stable branch.
[20:53] <chaos_> k
[20:53] <sagewk1> build 7ce8b7ae3bbad70fe257db00b6fc566f57f17132
[20:53] <chaos_> ok
[20:53] <sagewk1> did you have osd logging on when this happened?
[20:54] <chaos_> no
[20:54] <sagewk1> monitor logs?
[20:54] <chaos_> i've short logs
[20:54] <chaos_> without debug
[20:54] <sagewk1> oh well
[20:55] <sagewk1> are you using ipv4 or v6?
[20:55] <chaos_> ipv4
[20:56] <chaos_> however ipv6 support is enabled, but only fe80: ips are assigned
[20:57] <chaos_> and i don't use this with ceph
[21:15] <sagewk1> are you able to start with that patch?
[21:15] <chaos_> yea
[21:15] <chaos_> just done that
[21:15] <chaos_> works
[21:15] <sagewk1> i'm adding more error checks,but where the bad addr came from is still a mystery
[21:15] <chaos_> thx ;-)
[21:15] <sagewk1> np
[21:15] <chaos_> it's related do ipv6 support?
[21:17] <sagewk1> probably not, actually..
[21:17] <chaos_> btw. sagewk1 what's about paid ceph support? my boss asked before christmas if i need in our team person specially for ceph maybe instead of this we can pay you?:p
[21:17] <sagewk1> not sure exactly what is going on. basically an osd is booting and sending a zeroed out address to the monitor
[21:19] <sagewk1> we're close.. email bryan@dreamhost.com. i think we'd be just as happy having an external person doing testing too, though... the bottleneck is recruiting, not user interest
[21:22] <chaos_> ok, i'll forward this to him during weekly sprint
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[21:31] <chaos_> sagewk1, strange thing.. i can't mount fs through ceph-fuse
[21:32] <chaos_> when i'm doing strace on ceph-fuse i see Conenction timed out
[21:32] <chaos_> Connection*
[21:37] <sagewk1> look at the 'ceph osd dump' and 'ceph mds dump' and see if the addresses all look ok?
[21:37] * sagewk1 is now known as sagewk
[21:37] <chaos_> didn't change anything, mon daemons are listening at proper ports
[21:39] <sagewk> i'm wondering if the mdsmap and osdmap addresses are valid..
[21:39] <chaos_> hmm "host" has to be fqdn?
[21:39] <sagewk> what does the output from those comamnds look like?
[21:39] <sagewk> should be ip:port/nonce
[21:40] <chaos_> dumps look ok
[21:41] <chaos_> proper ips, ports
[21:42] <sagewk> i'd look at the ceph-fuse log to see who it is trying/failing ot connect to, and make sure you can connect to that port manually (telnet/whatever)
[21:44] <chaos_> how to turn on ceph-fuse logging?
[21:44] <sagewk> ceph-fuse --log-file /tmp/foo.log ...
[21:46] <chaos_> it might take while
[21:54] <chaos_> it just hangs
[21:54] <chaos_> futex(0x1cbc14cm, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 897, {1326747167, 12198000}, ffffffff) = -1 ETIMEDOUT (Connection timed out)
[21:54] <chaos_> from strace
[21:57] <chaos_> lol
[21:57] <chaos_> and it mounted fs
[21:57] <chaos_> after.. 10 minutes
[21:57] <chaos_> wtf
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[22:06] <sagewk> hmm, not even sure what ETIMEDOUT on a futex() call means
[22:06] <sagewk> strange
[22:06] <chaos_> now i can unmount && mount almost instant
[22:07] <chaos_> on each cluster node
[22:07] <chaos_> anyway ;-) everything works
[22:07] <chaos_> thanks sagewk
[22:07] <sagewk> np :)
[22:10] <jojy> sagewk:looks like a pthread condition call with timeout
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[22:11] <sagewk> yeah. i wonder which cond it timed out on..
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[22:16] <jojy> maybe objdump and search for the futex address can reveal some more
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