#ceph IRC Log

Index

IRC Log for 2013-03-18

Timestamps are in GMT/BST.

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[10:39] <coredumb> Hello
[10:40] <coredumb> Is there an easy and reliable way to make ceph work on EL6 ?
[10:40] * eschnou (~eschnou@85.234.217.115.static.edpnet.net) has joined #ceph
[10:44] <barryo> I've got it working on el6
[10:44] <coredumb> barryo: you used the provided rpms ?
[10:45] <coredumb> i feel stupid, just found the page in documentation
[10:45] <barryo> I used the rpms from http://ceph.com/rpm/el6/
[10:46] <barryo> if your wanting to use ceph for hosting VM images using KVM, you'll need to install a newer version of qemu-kvm package
[10:46] <coredumb> both server and client i guess ?
[10:46] <coredumb> yep
[10:47] <barryo> I install ceph-0.56.3-0.el6 boost-system-1.41.0-11.el6_1.2 boost-thread-1.41.0-11.el6_1.2 libcephfs1-0.56.3-0.el6 librados2-0.56.3-0.el6 librbd1-0.56.3-0.el6 xfsprogs-3.1.1-7.el6
[10:48] <coredumb> ok
[10:49] <barryo> you'll need ceph-devel as well for recompiling qemu-kvm
[10:51] <coredumb> is it possible to make a two ways mirroring for VM with only 2 servers ?
[11:00] <barryo> you'll need 3 mons for quorum
[11:00] <barryo> but you could run the 3rd mon on something other than the osd hosts
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[11:01] <coredumb> so i can have 2mons on osd + a 3rd one somewhere else ?
[11:02] <barryo> yeah
[11:04] <coredumb> Ok
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[11:21] <rtm> hi all
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[11:21] <rtm> I am new to ceph and just manually build ceph version 0.56.3
[11:22] <rtm> however i am not able to start ceph as a service.. using 'service ceph start' or '/etc/init.d/ceph start'
[11:23] <rtm> can someone provide help for this?
[11:25] <barryo> what distribution are you installing on?
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[11:28] <topro> rtm: you need an init script to start it like that. AFAIK init scripts are distribution specific so I don't think it will be part of ceph when building from upstream sources
[11:30] <rtm> OK, i have built in on a 12.04 precise
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[11:32] <rtm> my hardware is ARM based servers (armhf) not x86
[11:32] <rtm> how can i create init scripts?
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[11:37] <rtm> can i start ceph without initi scritps?
[11:39] <tnt> rtm: you should probably build packages. the git contains a proper debian/ dir so just using dpkg-buildpackage works and produces .deb with init script and debian/ubuntu integration.
[11:40] <rtm> OK, Thanks, let me give that a go
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[15:33] <absynth> hm, anyone around?
[15:34] <dennis> you feeling lonely? ;)
[15:34] <absynth> no, i have a deep-scrubbing cluster that is memleaking
[15:34] <absynth> I AM NOT HAPPY!
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[15:35] <tnt> yup, happens to me too.
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[15:35] <absynth> our top OSD now has 17G ram usage
[15:36] <tnt> I usually restart them at 1G per osd process ....
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[15:38] <absynth> that's memory usage from the last 15 mins
[15:38] <absynth> grew from 1g to 16g
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[15:45] * joelio finds a ceph -w process left running eats RAM
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[16:07] <joelio> hmm, clock skew detected on a mon, even though NTP sync'd to same server
[16:07] <joelio> same time on checking too
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[16:44] <absynth> I feel obliged to retract and rephrase my earlier statement: I AM HAPPY!
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[16:45] <wschulze> absynth: glad to hear that! ;)
[16:45] <tnt> absynth: how come ?
[16:47] <absynth> because inktank has awesome support...? *looks at wschulze pointing a AR-10 at him
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[16:47] <absynth> uhoh. if stxShadow joins, that is usually not a good sign
[16:47] <wschulze> absynth: Verrry good. :)
[16:47] <absynth> stxShadow: something broken?
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[16:49] <absynth> compared to the state 2,5 months ago, our ceph cluster is now really, really reliable, so i guess there is a legitimate reason to be happy, apart from being held at gunpoint
[16:52] <tnt> So does that mean the leak is plugged ?
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[16:54] <absynth> not quite
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[16:54] <absynth> i can see the bug ticket is closed, thoguh
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[17:10] <Karcaw> if i'm running 0.58, can i safely revert back to 0.57?
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[17:12] <joao> not really
[17:14] <joao> after the mon changes introduced in 0.58, reverting means still having a previous mon store around and being willing to lose data if it comes to that
[17:14] <joao> so the short answer is indeed: no, you can't safely revert
[17:15] <Karcaw> ok.. i was runnin a wip-branch for bug 4116, and it seems that the fix was in 0.58 so i moved forward, but now i'm seeing the same bug and was hoping to backout and see if it worked better
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[17:49] <Karcaw> what is the procedure for telling ceph that an OSD needs to go away? hardware gets old, how do i tell is clear data off osd #5 say?
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[17:53] <janos> google "ceph remove osd". it will give you goodies
[17:53] <janos> the first result iirc
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[19:35] <buck> guessing I'm late to the party, but is anyone else seeing this error with master?
[19:35] <buck> client/MetaRequest.cc: In function 'void MetaRequest::set_inode(Inode*)' thread 7fce75a02700 time 2013-03-18 11:34:26.427276
[19:35] <buck> INFO:teuthology.task.workunit.client.0.err:attempt_201303181132_0001_r_000000_0: client/MetaRequest.cc: 76: FAILED assert(_inode == __null)
[19:36] <slang1> buck: what are you running?
[19:36] <slang1> (which workunit)
[19:36] <buck> I'm seeing this with several teuthology tests. libcephfs, hadoop-wordcount
[19:36] <buck> er libcephfs-java, i haven't tried libcephfs (but assume it would be similar)
[19:37] <slang1> might be from the changes I merged Saturday. Let me see if I can reproduce it
[19:37] <buck> slang1: ok. Lemme know how that plays out.
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[19:41] <slang1> buck: yeah seeing the same
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[19:57] <tnt> eschnou: hey, hi there :)
[19:57] <tnt> the nick looks familiar :)
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[20:04] <PerlStalker> I restarted an osd to upgrade it from argonaut to bobtail and now I have 4 pgs that are stuck in active+clean+inconsistent state with scrub errors.
[20:04] <eschnou> tnt, hello, yes, sames eschnou as on twitter and pretty much everywhere else :-)
[20:05] <PerlStalker> The health detail looks like this: http://pastebin.com/HYFTZxmb
[20:05] <PerlStalker> How to I clean up the scrub errors?
[20:12] <PerlStalker> Is it just a matter of running "ceph pg repair" on each one?
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[20:22] <PerlStalker> n/m that did the trick.
[20:25] <lxo> interesting... it seems like the omap db corruptions I'm observing are always streams of zeroes at the end of pages. this might indicate a bug in btrfs munmap flushing...
[20:28] <lxo> gotta add some logging to leveldb to check my theory that the problem occurs at munmap/mmap boundaries
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[20:38] <lxo> otoh, it could be some trickier interaction between mmap and btrfs snapshots. e.g., if there's no flushing of the database output file to disk before taking a snapshot, it might end up only partially consistent. and unfortunately leveldb's flush is a do-nothing, only sync actually ensures the mmapped output file is in stable storage
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[23:01] <SvenPHX> Trying to raise the maximum PGs in 0.56.3 and I'm struggling to have it take, possibly operator error
[23:01] <SvenPHX> I have this set in ceph.conf
[23:01] <SvenPHX> [mon]
[23:01] <SvenPHX> mon data = /data/${name}
[23:01] <SvenPHX> keyring = /data/${name}/keyring
[23:01] <SvenPHX> mon max pool pg = 72000
[23:02] <SvenPHX> I restarted the cluster
[23:02] <SvenPHX> but I get:
[23:02] <SvenPHX> # ceph --admin-daemon ceph-mon.a.asok config show | grep max | grep pool
[23:02] <SvenPHX> "mon_max_pool_pg_num": "65536",
[23:03] <SvenPHX> I did just notice 'num' missing from the directive
[23:03] <dmick> there you go
[23:03] <SvenPHX> ;)
[23:03] <SvenPHX> I swear I spent two hours staring at it and didn't notice until I pasted it here
[23:03] <dmick> 64K is the default
[23:03] <SvenPHX> typical ...
[23:04] <SvenPHX> yessir, thank you
[23:04] <dmick> it may help for next time to know that they're all listed in common/config_opts.h
[23:04] <dmick> but asok is good too
[23:04] <SvenPHX> TYS
[23:04] <SvenPHX> that's good to know
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[23:06] <SvenPHX> While I'm asking questions ... is there a more detailed description of purpose of each of the tunables in 0.56.3?
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[23:10] <dmick> many are documented at ceph.com/docs; others at least have comments in that header file; those are the only two I know of
[23:10] <SvenPHX> okaydokey, thanks. I found the list in the docs and the header files ...
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