#ceph IRC Log

Index

IRC Log for 2013-03-15

Timestamps are in GMT/BST.

[0:01] * barryo1 (~barry@host86-128-180-76.range86-128.btcentralplus.com) has left #ceph
[0:02] * ScOut3R (~ScOut3R@c83-249-233-227.bredband.comhem.se) Quit (Remote host closed the connection)
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[3:57] <guocai> :)
[4:04] * guocai (~dinglbo@171.216.81.134) has left #ceph
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[15:17] <barryo> I'm having a few issues getting ceph working with libvirt and KVM, I'm using kvm 0.15.1 and libvirt 0.10.2-18 on SL6.3. I've followed the steps in http://ceph.com/docs/master/rbd/libvirt/ and get this http://pastebin.com/Dv2F6faq when i try to start the VM
[15:19] * frank9999 (~frank@kantoor.transip.nl) Quit ()
[15:21] <iggy> barryo: kvm 0.15? did that even have rbd support?
[15:22] * mdxi (~mdxi@74-95-29-182-Atlanta.hfc.comcastbusiness.net) Quit (Ping timeout: 480 seconds)
[15:23] <barryo> The default is 0.12, I built the 0.15 rpm by hand with --enable-rbd added
[15:23] <barryo> i managed to create an image in my rbd pool using "qemu-img create -f rbd rbd:libvirt-pool/testing 2G"
[15:24] <iggy> that's still pretty ancient, I'd be surprised if that works well
[15:25] <barryo> For some reason I had convinced myself it was the latest version
[15:26] <iggy> 1.4 is out
[15:26] <iggy> 0.15 is like 4 years old
[15:26] <barryo> ouch
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[15:27] <barryo> I'll repackage a newer version and see what happens
[15:27] <iggy> might just grab the latest fedora package and rpm-rebuild it
[15:28] <iggy> but traditionally people have had issues running versions of qemu/kvm on redhat's kernel
[15:30] <barryo> I'm not really in a position where I can use a newer kernel sadly
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[15:31] <iggy> yeah, was just pointing out that it might be a problem
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[18:49] <Kdecherf> What is temperature in mds dir fragmentation?
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[18:58] <jwilliams> Hi
[18:59] <jwilliams> I'm running a ceph cluster (v0.56.3)
[18:59] <scuttlemonkey> kdecherf: what do you mean, "temperature" ?
[19:00] <jwilliams> I'm seeing this in my ceph -w:
[19:00] <jwilliams> 404/2244554 degraded (0.018%); 202/1122277 unfound (0.018%)
[19:00] <jwilliams> and all of my rbd commands are being blocked
[19:00] <scuttlemonkey> jwilliams: can you pastebin your ceph -s output?
[19:01] <jwilliams> http://pastebin.com/KJHAFKVm
[19:02] <Kdecherf> scuttlemonkey: it's the question, what does it mean? (ref: http://ceph.com/docs/master/cephfs/mds-config-ref/)
[19:03] <scuttlemonkey> so it looks like you had an osd go down or something that caused the cluster to need to rebalance
[19:03] <scuttlemonkey> some are recovering already
[19:04] <jwilliams> yes, I lost some osds, bad disks, user error, etc.
[19:04] <jwilliams> it's been sitting at 0.018% for at least 12 hours
[19:04] <scuttlemonkey> jwilliams: you can start digging deeper to see what is stuck:
[19:04] <scuttlemonkey> ceph health detail
[19:05] <gregaf> Kdecherf: the MDS maintains a heat map of the dentries in its cache
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[19:06] <scuttlemonkey> jwilliams: or you could just 'ceph pg dump'
[19:07] <jwilliams> ok, what do I do with that information?
[19:07] <scuttlemonkey> and you can pipe that to grep for | grep incomplete or whatever
[19:07] <jwilliams> I've tried pg repair
[19:07] <scuttlemonkey> then we can pick one of them up and shake it a bit
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[19:07] <scuttlemonkey> 'ceph pg {pg} query' and see what's up
[19:07] <scuttlemonkey> where it currently lives, where it thinks it _should_ live
[19:08] <scuttlemonkey> it may be something as easy as an osd restart
[19:08] <Kdecherf> gregaf: what is its unit? how can I calculate a good value for my cluster?
[19:08] <jwilliams> I'm seeing this: { "osd": 6, "status": "osd is down"},
[19:08] <jwilliams> but I removed that osd
[19:08] <jwilliams> it no longer exists
[19:08] <scuttlemonkey> did you mark it out?
[19:08] <gregaf> it's just a number
[19:09] <gregaf> it gets bumped, I think just by 1, when the dentry gets hit
[19:09] <gregaf> you can't set it directly
[19:10] <Kdecherf> gregaf: oh ok, thx
[19:11] <jwilliams> ceph osd out 6: osd.6 does not exist.
[19:11] <gregaf> as for all the tunables surrounding that temperature, it's heavily dependent on your cluster and those won't be used unless you're using a lot of not-very-stable features
[19:11] <scuttlemonkey> oh, so it's not just dead...you already ripped it out
[19:12] <jwilliams> yes
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[19:21] <Kdecherf> gregaf: I'm checking options and features of the MDS to try to fix the strange latency I observe sometimes, do you have any news about it?
[19:21] <gregaf> I'm writing some analysis scripts, and creating bugs make analysis easier ;)
[19:22] <gregaf> should have some information today or tomorrow
[19:22] <Kdecherf> great! :)
[19:26] <scuttlemonkey> jwilliams: sry phone
[19:26] <jwilliams> np
[19:26] <scuttlemonkey> a good resource to manipulate your osds is here: http://ceph.com/docs/master/rados/operations/control/
[19:27] <scuttlemonkey> my gut reaction is to mark 6 as lost...but I have never done that personally
[19:27] <scuttlemonkey> lemme poke someone here in the eye and see if I can get them to weigh in on best incantation for your situation
[19:28] <jwilliams> I tried that : ceph osd lost 6 --yes-i-really-mean-it: osd.6 is not down or doesn't exist
[19:29] <Kdecherf> gregaf: tell me if you want more data about the issue ;-)
[19:29] <jwilliams> would creating a new osd.6 on another disk convince it to not look there?
[19:31] <jwilliams> bbl
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[19:35] <dilemma> jwilliams: I've run into an issue that seems identical to the one you're describing right now
[19:35] <dilemma> here's what I had to do:
[19:36] <dilemma> 1 - create a new osd.6, bring it into the cluster with a weight of 0
[19:36] <dilemma> 2 - wait for the pg to reflect that it's no longer trying to look for a copy on osd.6
[19:36] <dilemma> 3 - mark the unfound placement group as lost
[19:37] <dilemma> this obviously lost objects
[19:37] <dilemma> but those objects are already gone, due to your disk failure
[19:38] <dilemma> after that, I set the weight of the osd back to normal, and allowed it to be properly backfilled
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[19:51] <scuttlemonkey> jwilliams: would love to see 'ceph osd dump' when/if you get back
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[21:02] <mikedawson> Any of you built a scaleable, non-blocking / nearly non-blocking network for Ceph? If so, are you separating out public network and cluster network?
[21:03] <jwilliams> scuttlemonkey: http://pastebin.com/G7hAqyAU
[21:03] <scuttlemonkey> ahh ok
[21:04] <scuttlemonkey> jwilliams: so when the osd died, did you just immediately do an rm?
[21:07] <jwilliams> that is entirely possible
[21:07] <scuttlemonkey> gotcha
[21:07] <scuttlemonkey> normally you would want to mark it out first and let the cluster balance data away from that osd
[21:08] <scuttlemonkey> in this case you can do what dilemma suggested
[21:08] <scuttlemonkey> bring up an osd.6 with weight 0 and let the cluster figure it out
[21:08] <scuttlemonkey> once you're back to good health you can set the weight to start using that replacement osd again and go from there
[21:08] <jwilliams> thank you, i wasn't sure if that would cause more problems than it solved
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[22:29] <sstan> what does the op/s figure include in ceph -w ?
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[22:29] <sagewk> sstan: osd read and write requests
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[22:30] <sstan> thanks : ) .. I tought that it included also replication traffic
[22:30] <sagewk> i don't think so... but would have to double check the code.
[22:30] <sagewk> i think it's just client-initiated requests
[22:30] <sstan> would make sense
[22:31] <sstan> do you know by any chance what a "record length" is ?
[22:35] <dmick> sstan: context?
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[22:35] <sstan> i/o benchmarking
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[22:35] <dmick> output from.. ?
[22:36] <dmick> ('record length' doesn't appear in our sources that I can see)
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[22:36] <dmick> rados bench has an op size
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[22:37] <dmick> ceph tell osd <name> bench takes a blocksize
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[22:40] <barryo1> earlier on today i posted about this error message when trying to start a VM using rbd storage - http://pastebin.com/Dv2F6faq
[22:40] <barryo1> it turns out that switching to zero auth fixes the error
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[22:42] <barryo1> does anyone know why using cephx would cause that to happen?
[22:45] <slang1> barryo1: sorry if I missed this earlier, what were the full set of steps you took to get to that point?
[22:47] <joshd> barryo: you need a newer qemu, >=1.0
[22:49] <barryo1> joshd: so it's related to me still using qemu 0.15
[22:50] <joshd> yeah, 1.0 had the patch to allow parsing id=admin, etc
[22:52] <sstan> thanks dmick. More precisely, the context is iozone. The tool seems to do a good job (exports results in xls files). I think the record length is the same as block size
[22:53] <barryo1> maybe I should put the effort in to get a newer version of the rpm building on el6, saying that I'd be surprised if somene else hasn't beat me to it
[22:55] <dmick> ah. I wouldn't have guessed iozone
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[23:05] <sstan> (ceph) raid 0 -> btrfs -> rbd -> lvm -> ext3 (virtual machine)
[23:05] <sstan> so many layers :/
[23:06] <iggy> how's btrfs treating you?
[23:06] <sstan> it still works, albeit I didn't test it much yet
[23:07] <sstan> had 1 problem : rm -r * doesn't work, files don't want to disappear (so I just format the partition when needed)
[23:09] <gregaf> slang: sagewk: see my update on #4451?
[23:09] <gregaf> I'm wondering if we do have a minor design hole there or if we think it's just an implementation bug
[23:10] <mjevans> sstan: are you sure those are files and not snapshot points?
[23:11] <sstan> I'm not sure. They looked like normal files/folders
[23:12] <mjevans> If they look like /folders/ poke at them via the btrfs tools (You are using that?) or figure out what the tools for xfs/whatever are.
[23:12] <sagewk> gregaf: i'm confused.. if its in the stray dir, that puts it under ~mds0/strayN/..., owned by mds0?
[23:12] <slang1> gregaf: the strays get logged just like normal inodes, yes?
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[23:12] <gregaf> sagewk: right, but for some reason it's not reading it in during replay (dunno why), and the *client* when doing reconnect doesn't have any other data for the inode except its number
[23:12] <slang1> gregaf: (so it should be in the journal on replay...)
[23:12] <sagewk> iirc an inode should never have an ino-only path in the cache unless we're in the middle of relinking it, or it's a base ino
[23:13] <sagewk> sounds like the replay part is the problem, then.. there should never be an inode in teh mds cache without a path
[23:13] <gregaf> I haven't traced all the journal events (except seeing it didn't show up during replay), but when the MDS crashed the inode was in the stray dir
[23:13] <gregaf> that's what I'm saying, the inode isn't in the cache at all
[23:13] <PerlStalker> Is cephfs considered stable enough for use?
[23:13] <gregaf> then the client reconnect message comes in, and it includes caps on that inode (presumably it just hadn't dropped them yet)
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[23:14] <gregaf> and the mds goes "I don't have this, and the reconnect message doesn't include a path, so I must not be auth"
[23:14] <mjevans> PerlStalker: as of about a month ago the answer was still 'not yet'; is that close enough for you to consider that 'it's not yet for my stuff even if they say it is now' ?
[23:15] <mjevans> PerlStalker: The other components of ceph, IIRC, are considered stable.
[23:15] <PerlStalker> mjevans: Close enough.
[23:15] <PerlStalker> mjevans: I'm already using rbd for my VMs but I was considering using cephfs when I rebuild/upgrade my file server this summer.
[23:16] <mjevans> PerlStalker: Oh what management tool are you using for your VMs?
[23:17] <PerlStalker> mjevans: libvirt+kvm
[23:17] <PerlStalker> Plus pacemaker and a little glue script.
[23:17] <mjevans> PerlStalker: Did you manage to get libvirt to migrate guests using RBD storage? When I tried it libvirt didn't seem to understand that rbd was migratable.
[23:17] <slang1> gregaf: it looks like its been trimmed from the journal
[23:17] <PerlStalker> mjevans: It moved just fine for me.
[23:18] <slang1> gregaf: 2013-03-15 09:07:52.400574 7f8ca5706700 10 mds.0.journal _stored_backtrace 1000000025f
[23:19] <mjevans> Now that's annoying; it makes me reconsider that I did something incorrectly; but it's so haphazardly documented that I can't be sure where or what...
[23:19] <gregaf> slang1: that entry is after the inode has been recreated
[23:19] <gregaf> (I didn't look too much into what sequence of events made that occur)
[23:19] <mjevans> Did you use a network disk with an rbd file, but no 'pool' or 'volume' setups? (I couldn't make sense of how to connect the three)
[23:20] <PerlStalker> mjevans: Just a network disk. It was a lot simpler.
[23:21] <mjevans> PerlStalker: me too; now I -really- wonder why it wouldn't migrate. Did you also use the qemucommandline stuff to set discard_granularity?
[23:21] <PerlStalker> mjevans: No
[23:21] <gregaf> sagewk: slang1: ah, actually it was never on disk to begin with I bet — the inode is taken out of the prealloc queue at 2013-03-15 09:07:33.611890 and then the MDS crashes at 2013-03-15 09:07:33.657943
[23:21] <mjevans> Are you interested in supporting passing TRIM commands down to storage so that holes can be punched in your rbd storage?
[23:22] <gregaf> it was created and then unlinked during that time
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[23:23] <PerlStalker> mjevans: Not really
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[23:26] <mjevans> I suppose I can test this one more time
[23:27] <PerlStalker> mjevans: This is what I use for my disks: http://pastebin.com/JsznxJtm
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[23:32] <barryo1> it looks like it's quite easy to convert the fc20 qemu rpm to work under el6, if I get this working I'll attempt to maintain it on github for others to share
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[23:54] <mjevans> PerlStalker: thanks, however you really should make it look more like: http://pastebin.com/h05DYngT Aww he left while I was taking care of other things.
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