#ceph IRC Log

Index

IRC Log for 2013-01-23

Timestamps are in GMT/BST.

[0:00] <noob21> dmick: a little bit. i have to learn it because i just took a job with facebook. so in a few weeks i'm going to get the crash course
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[0:01] <joao> noob21, #136 has been somewhat addressed
[0:01] <wer> ty dmick.
[0:02] <joao> I'm not sure if there's something in the ticket that might be missing or imagined at the time in a different way, but there's already a somewhat 'sensible' grammar and 'help' dumps (although I'm unsure if it works for each subcommand)
[0:03] <noob21> ok
[0:03] <dmick> noob21: the way I'd recommend is: get a github account if you don't have one, fork ceph/ceph, clone that to your local ws, hack away; when done, push to your forked repo and email for a review request; when done, send a pull request and we'll integrate it
[0:03] <noob21> just wondering
[0:03] <joao> noob21, but feel free to navigate the code and let us know if you need help ;)
[0:03] <dmick> feel free to tear into that radosgw-admin bug :)
[0:03] <noob21> sounds easy enough :)
[0:03] <noob21> it's all c++ right?
[0:03] <dmick> mostly c++; some python, some c
[0:04] <dmick> some bash
[0:04] <noob21> i know python the best but it wouldn't hurt to learn more c and c++
[0:09] <wer> dmick: do you know if there some trick to making rest-bench work? It doesn't seem to like anything I throw at it :( I seem to recall having this exact trouble before.... it kind of mangles --api-host and bombs....
[0:10] <noob21> dmick: ok it is forked :)
[0:11] <wer> rest-bench --api-host=localhost --bucket=test_bucket -b200 -t2 write ...... seems to parse host=localhost and gives me usage. And I don't know what --block-size is. Assuming bytes...
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[0:15] <dmick> wer: I don't, but I can read the code if you like
[0:15] <wer> nah. I can go do that if that is what you have to do :) thanks!
[0:16] <wer> internet just wants to talk about shooting rifles when I go looking for syntax help :)
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[0:29] <wer> dmick: ... I may be too stuupid. I just pulled apt-get source rest-bench and got some ancient copy of ceph-0.41 with no mentions of rest-bench... I don't know where rest-bench comes from at this point.
[0:35] <wer> I bet it wants to create bucket... which means I have to use keys.... can't test an public bucket maybe.
[0:38] <wer> gad. I got it dmick..
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[0:57] <dpippenger> anyone using ceph with openstack have any pointers on getting the rbd_cache option passed through to kvm?
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[1:00] <dmick> wer: sorry, glad you made it
[1:02] <joshd> dpippenger: if you always want to use it, you can just put rbd cache = true in your ceph.conf
[1:03] <joshd> dpippenger: on the compute node, that is
[1:03] <dpippenger> hrm, I tried that but I didn't see much difference, I was assuming the kvm interface to librdb was overriding it with it's default of no cache
[1:04] <wer> dmick: no worries. The moral of the story is that it wants to make a bucket.... so it requires permissions. I figured if the permissions were such that the bucket I told it to use were publicly accessible then it would try.... but it doesn't. I think this is more acceptable then tsung on puts and there appears much room for throughput growth, as io on many disks is not being hit. I think once I get my 10gig links up this will get interesting :)
[1:05] <wer> oh, however rest-bench does explode once it finishes with a fantastic assert issue.... but I am not complaining.
[1:07] <dpippenger> joshd: you know I think I just messed up the config, I put the rbd cache in [global] instead of [client]
[1:07] <dmick> wer: file an issue
[1:07] <joshd> dpippenger: it should be getting picked up, and ceph.conf overrides kvm's setting
[1:07] <joshd> dpippenger: global works too; it's the top of the hierarchy
[1:08] <dpippenger> hrm.. balls... I put these three directives in, are there any more I would need?
[1:08] <dpippenger> rbd cache = true
[1:08] <dpippenger> rbd cache max dirty = 32000
[1:08] <dpippenger> rbd cache target dirty = 3200
[1:10] <dpippenger> oh wait, crap that's in bytes
[1:10] <wer> dmick: where can I file this issue? I think it explodes cleaning up after itself. I can see the space being freed up until explosion.
[1:10] <dpippenger> who wants to cache in bytes lol
[1:10] <wer> redmine?
[1:10] <dpippenger> I'll try adding some zeros
[1:11] <joshd> dpippenger: yeah, that's probably the problem. 32k isn't enough for everybody
[1:13] <wer> http://pastebin.com/h8KphR2M of explosion.
[1:16] <dmick> wer: yes, redmine
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[1:16] <wer> Do I need a username?
[1:16] <dmick> I think you need to register to be able to file an issue, yes
[1:17] <dmick> just so you can be notified of changes in the issue if nothing else.
[1:17] <wer> Is it tied to the feds?
[1:17] <wer> :)
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[1:20] <dmick> lol
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[1:22] <wer> weird. I can't login.... but it sent me a change password link and let me reset my password. I am going to let it sit and will file something tomorrow.
[1:22] <wer> Thanks for all the help dmick! again.
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[1:30] <dmick> wer: I can check on that; pm me your username
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[2:00] <noob2> dmick: anything special I need to do to use your usage message? I saw my pull was merged but I like your message better
[2:04] <wer> dmick: http://tracker.newdream.net/issues/3896 Is this useful enough information?
[2:08] <dmick> noob2: apparently Yehuda just took your request, so I'm happy to let it go
[2:08] * wer is now known as wer_gone
[2:08] <dmick> wer_gone: that's more than enough, thx
[2:08] <wer_gone> k sweet!
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[2:09] <noob2> ok. thanks. this is my first github experience :-)
[2:09] <dmick> noob2: my first actually tryhing to deal with a pull request; I'd hoped to be able to pull it to a different branch through github but it looks like that wasn't possible
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[2:11] <noob2> which branch are you guys working on?
[2:12] <dmick> bunches
[2:13] <dmick> for things that need some change before merging, typically a 'wip-' branch
[2:13] <dmick> so I was hoping I could tell github to create a new branch with your pull req, but I don't know if it can do that
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[2:16] <noob2> gotcha. I'll keep that in mind for future changes
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[4:26] <BillK> How can I change the journal size ... shutdown, edit ceph.conf, restart ... or is it more complicated than that?
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[4:40] <slang1> BillK: yeah that should do it
[4:43] <BillK> slang1: thanks
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[7:54] <xiaoxi> hi
[7:55] <xiaoxi> it seems there are some bug in /etc/init.d/ceph
[7:55] <xiaoxi> it just set ulimit on **local** node (where the script run),but not all nodes,even with -a option
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[10:37] <tnt> Is anyone maintaining a ceph client 3.6.x based tree by anychance ?
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[11:43] <tnt> .. just applied 158 ceph related commits over 3.6.11 ... now will it build ? :p
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[12:37] <madkiss> tnt: the real interesting question is: will it blend?
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[13:52] <lxo> I've been putting off the upgrade to 0.56.1 while I performed some surgery on my home network after a lightning strike. now I'm about to start building it, but I wonder if 0.57 or so is imminent, in which case I'd hold on to 0.55 just a little bit longer
[13:55] <tnt> madkiss: let's see if it boots :p
[13:55] <lxo> I should note that 0.55 has been pretty solid for my ceph fs uses. after I figured out the option to avoid ceph.ko running out of memory getting listings of large dirs, and I mostly stopped using ceph-fuse (and its share of problems) for heavy-ish backups, I've been pretty happy with it
[13:56] <lxo> so, unlike argonaut, that I wasn't comfortable recommending for distributed filesystem uses, it's looking like I'm going to be able to do so with bobtail
[13:57] <lxo> congrats on the great progress
[13:57] <tnt> what kernel client version do you use ?
[13:57] <absynth_47215> lxo: admit it, you have been paid off by inktank to write this. right? ;)
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[14:06] <lxo> absynth_47215, not at all. unless you count getting great software as a form of payment ;-)
[14:07] <lxo> if so, I've been paid very well indeed ;-)
[14:08] <absynth_47215> jeez
[14:08] <absynth_47215> that was almost cheesy ;)
[14:08] <lxo> heh
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[14:10] <lxo> considering I've been playing with ceph for almost a couple of years now, having endured numerous bugs in the process, you might be able to imagine how happy I am that I'm finally getting a stable distributed and replicated filesystem out of it :-)
[14:10] <absynth_47215> i think... you... err... made your point ;)
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[14:24] <darkfaded> lxo: hehehe, matches with what I saw during my last class. before then it was always like 1 hour of theory till people get the idea, then 1 hour set it up, then 10 mins till someones makes it topside. last time i *forgot* my dd loop
[14:24] <darkfaded> and it kept running
[14:25] <darkfaded> (the week before that it died on one "sync" but hey ;)
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[14:27] <absynth_47215> i sure hope we will soon be able to sing similar hymns to Ceph :)
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[15:24] <Anna30F> hello
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[15:27] <Anna30F> join me, it's free => http://adultfriendfinder.com/go/g655764
[15:28] <darkfaded> lok
[15:28] * joao sets mode +b *!*Anna30F@*.fbx.proxad.net
[15:28] * Anna30F was kicked from #ceph by joao
[15:28] <scuttlemonkey> hah, beat me to it by 1 second
[15:28] <joao> :)
[15:28] <elder> Me too.
[15:28] <darkfaded> she just wanted to help adding more replicas ;>
[15:28] <scuttlemonkey> lol
[15:28] <elder> She's cute though.
[15:29] <elder> :)
[15:29] <darkfaded> riiiiiiight
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[15:29] <joao> and suddenly that site just got a spike on page views
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[17:34] <brollo> greets @all
[17:34] <brollo> anyone knows how to deal with a full ceph osd ?
[17:35] <brollo> i can not resize the osd nor add another node :-(
[17:36] <brollo> the osd s(2) are not coming up, and i can not del data on it
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[17:37] <brollo> is it possible to delete some rbds on the nodes ?
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[17:40] <darkfaded> heh. 5 minutes to sort out a full-blown failure and the first idea is deleting something
[17:41] <darkfaded> NOT a storage admin
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[17:46] <absynth_47215> waiting for the ML posting... ;)
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[19:36] <drokita> What is the difference between format 1 and format 2 RBD devices?
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[19:52] <elder> Format 2 rbd devices support additional features not available in format 1.
[19:52] <elder> In particular, rbd layering is implemented in format 2.
[19:52] <elder> That feature is not yet available in the kernel rbd client.
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[19:58] <paravoid> sigh
[19:58] <paravoid> so my cluster was resyncing
[19:58] <paravoid> then out of the blue
[19:59] <paravoid> osdmap e87468: 144 osds: 115 up, 81 in
[19:59] <paravoid> pgmap v1765762: 16952 pgs: 5 inactive, 44 active, 3417 active+clean, 3554 active+remapped+wait_backfill, 180 active+degraded+wait_backfill, 2 stale, 3 stale+active, 265 stale+active+clean, 42 stale+active+remapped+wait_backfill, 643 peering, 11 stale+active+degraded+wait_backfill, 238 remapped, 867 active+remapped, 162 down+peering, 268 active+remapped+backfilling, 2032 active+degraded, 233 stale+peering, 31 active+degraded+backfilling, 1155 active+deg
[19:59] <paravoid> for no apparent reason
[19:59] <paravoid> random OSDs
[19:59] <nhm> paravoid: shoot. It had improved for you too hadn't it?
[20:00] <paravoid> I added more boxes on Monday, so it was quiet
[20:00] <paravoid> switched mon to different boxes as it's memory leaking
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[20:34] <sagelap1> paravoid: do you have stack traces for the stopped osds?
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[20:46] <paravoid> no
[20:48] <paravoid> sagelap: well, I have this: http://pastebin.com/UUR9Ayvw
[20:48] <paravoid> but I think this may be a secondary failure
[20:48] <paravoid> i.e. it happened later
[20:49] <paravoid> now I'm getting a lot of
[20:49] <paravoid> 2013-01-23 19:49:17.285196 7f324480c700 0 cephx: verify_reply coudln't decrypt with error: error decoding block for decryption
[20:49] <paravoid> which is very strange
[20:49] <paravoid> 2013-01-23 19:49:17.285210 7f324480c700 0 -- 10.64.32.16:6828/2990 >> 10.64.0.175:6826/17942 pipe(0x15c82d80 sd=82 :33664 pgs=360526 cs=4 l=1).failed verifying authorize reply
[20:54] <sagelap> paravoid: for that dump there should be an assert msg with a line number further up in the log
[20:55] <sagelap> the cephx error is strange... i'm not sure we've seen that one.
[20:56] <paravoid> -1> 2013-01-23 19:35:27.081698 7fecafca7700 5 --OSD::tracker-- reqid: unknown.0.0:0, seq: 9139, time: 2013-01-23 19:35:27.081698, event: started, request: pg_notify(3.302b(125) epoch 87945) v4
[20:56] <paravoid> 0> 2013-01-23 19:35:27.081565 7fecac4a0700 -1 osd/PG.cc: In function 'bool PG::choose_acting(int&)' thread 7fecac4a0700 time 2013-01-23 19:35:27.056824
[20:56] <paravoid> osd/PG.cc: 1269: FAILED assert(want_acting.empty())
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[20:57] <sagelap> paravoid: do you mind opening an issue for that?
[20:57] <sagelap> with that stack trace and msg?
[20:57] <paravoid> I don't mind, but is this enough info?
[20:58] <sagelap> if you have the core, the epoch the pg is on would be nice, along with that osdmap, and the pgid
[20:58] <sagelap> a bit of digging in gdb to get that info
[20:58] <paravoid> no core, sorry :(
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[21:04] <sagelap> np, the log and assert will hopefully be enough
[21:04] <sagelap> maybe a tarball of recent osdmaps would be helpful if it comes to it, if you want to set it aside (they get trimmed over time)
[21:14] <paravoid> and how would I do that?
[21:14] <paravoid> :)
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[21:22] <noob2> hey guys. question about the rbd python api. does that use the kernel rbd or is it something else?
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[21:26] <rturk> noob2: it's a wrapper around librbd
[21:26] <rturk> it should be completely in userland
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[21:28] <noob2> ok cool so that doesn't require the kernel module. that's what i was hoping for
[21:30] <noob2> i was hoping to give the programmers at work a demo of how this works using python and rhel 6
[21:31] <noob2> looks like librbd is included in the rpm packages for bobtail :D. I think i'm good to go!
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[21:33] <noob2> rturk: any idea where the java s3 libraries come from?
[21:33] <noob2> looks like you download the java aws sdk?
[21:34] <noob2> does ceph's s3 api support encryption? it doesn't mention it on the wiki
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[21:37] <xmltok> it uses apache with fastcgi, so if you are talking about ssl, you can do that with apache
[21:38] <noob2> gotcha
[21:38] <noob2> it looked like s3's api encrypts client side and then uploads to the gateway
[21:38] <noob2> maybe ceph doesn't need to even worry about it
[21:40] <Gugge-47527> if i have osd's of different sizes, so i have to play around with weight, or does it "just work"?
[21:40] <noob2> no you have to play around with the weight
[21:40] <noob2> i'm using a weight of '1' for each TB of hard drive size
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[21:44] <Gugge-47527> noob2: yep, i figured i had to do something like that :)
[21:45] <noob2> i believe the weight is an arbitrary number. so long as you have some kind of system then statistically it will balance out.
[21:47] <Gugge-47527> super
[21:48] <noob2> yup :)
[21:48] <noob2> it's very flexible
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[21:48] <Kioob> rah ! RBD really should use one uniq major device id and change only minor device id
[21:49] <noob2> that'd be nice
[21:49] <Kioob> tools like �iostat� or �lvm� don't works has expected with it
[21:49] <Kioob> #filters/filter.c:129 /dev/rbd25: Skipping: Unrecognised LVM device type 234
[21:49] <Kioob> #filters/filter.c:129 /dev/rbd24: Skipping: Unrecognised LVM device type 235
[21:49] <Kioob> #filters/filter.c:129 /dev/rbd23: Skipping: Unrecognised LVM device type 236
[21:50] <noob2> dstat works ok for me
[21:50] <noob2> with the --disk-util option
[21:51] <Kioob> iostat �works�, but show emcpowerig, emcpowerhq, emcpowerha, etc instead of rbd6, rbd7, rbd8, etc
[21:51] <noob2> yeah i got the same thing. it was quite odd
[21:51] <noob2> i was like what the hell is that? haha
[21:52] <Kioob> and for LVM, I have to register *each* device in the lvm.conf
[21:52] <noob2> ah
[21:52] <noob2> but i'm sure you'd run into a problem where on reboot the drive numbers could change
[21:53] <Kioob> of course ;)
[21:53] <noob2> haha
[21:53] <noob2> if ceph was supported in the fstab that would rock
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[22:30] <darkfaded> noob2: regarding fstab, if you have the kernel driver in and use _netdev, won't it work?
[22:30] <darkfaded> i did not try
[22:30] <darkfaded> just assumed it probably works
[22:30] <amichel> So I logged into my test ceph box today and ceph -s is hanging. I'm not sure what to look at to figure out why that's happening. Anyone have any ideas?
[22:31] <darkfaded> logs? :)
[22:31] <darkfaded> but last time i was led to look at the ceph "admin sockets"
[22:31] <amichel> Oh, sorry, I checked the logs but I don't see anything goofy in there
[22:31] <darkfaded> if you look for sockets below /var named i.e. mds-a.asock or something like that
[22:31] <darkfaded> better google the details
[22:32] <darkfaded> (google is better than my memory)
[22:32] <darkfaded> (since recently, they must have changed something)
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[22:34] <noob2> darkfaded: haven't tried that. i should give it a shot
[22:35] <noob2> fstab does'nt know about rados pools though so that prob wouldn't work
[22:37] <amichel> Good tip darkfaded, looks like my failed attempt to add a new monitor last week left some remnants
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[22:39] <amichel> Yep, removed the broken monitor from the monmap by hand and it's working again
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[22:47] <phantomcircuit> amichel, ceph quorum_status is a good starting point
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