#ceph IRC Log

Index

IRC Log for 2015-07-31

Timestamps are in GMT/BST.

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[5:23] <edrian> Morning!
[5:23] <edrian> new issue of the day: https://pastebin.mozilla.org/8841176
[5:24] <edrian> all the osds are stuck in active+remapped after I changed the crush tunables
[5:25] <edrian> Tunables are now _hammer_. With _default_ it is a bit better as 98 pgs will be active but all the other are still stuck in active+remapped
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[5:27] <edrian> any idea of what to investigate? All was fine before I decided to changed the tunables setting but it doesn't revert to a working state whatever I tried
[5:32] <lurbs> What does 'ceph osd tree' show you?
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[5:41] <edrian> ceph osd tree shows me that: https://pastebin.mozilla.org/8841177
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[5:43] <lurbs> That's a very unbalanced cluster. Massive amount of weight on host "osd-4", as compared to the others.
[5:43] <lurbs> Also, were you aware that all of the OSDs on host "osd-1" were down?
[5:43] <lurbs> Also, the reweight on all OSDs on host "osd-2" is 0.
[5:45] <lurbs> How large are the drives on the hosts "osd-1", "osd-2" and "osd-3"? I'm guessing the drives in "osd-4" are 4 TB.
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[5:46] <edrian> osd-1 is down on purpose, I removed it. It doesn't host anything anymore.
[5:46] <doppelgrau> edrian: you should remove it from the crushmap too
[5:46] <lurbs> The default CRUSH map will try to put replicas on different hosts. It's not at all surprising that it's failing, given that the total weights of the disks on the first three machines is around 0.3, and the fourth is over 100 times that (~39.4).
[5:46] <edrian> osd-2 has been outed of the cluster too
[5:47] <theanalyst> is it recommended to set `no out ` flag before upgrading a cluster?
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[5:47] <edrian> osd-3 has 100GB disks. I'm goign to remove it too to host everything on osd-4
[5:47] <doppelgrau> edrian: have you changed the crush-rule?
[5:48] <doppelgrau> edrian: default failuredomain is host, not osd ???
[5:49] <doppelgrau> theanalyst: noout makes always sense, if you expect an osd to be down on purpose so long, that rebalancing would start otherwise (15 min default)
[5:49] <doppelgrau> theanalyst: so depends
[5:50] <theanalyst> doppelgrau: yep have a relatively biggish cluster so probably thinking of setting it as by the time we restart all the nodes it may take a bit of time
[5:51] <doppelgrau> theanalyst: why dont you do an rolling upgrade?
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[5:52] <doppelgrau> theanalyst: but if you try an ???restart all at once??? upgrade noout seems like a good idea, perhaps even ???nodown??? if the load with douzens od osds start peering at the same time leads to timeouts => osd markes down
[5:52] <theanalyst> doppelgrau: didn't get.. what do you mean by rolling upgrade
[5:53] <theanalyst> ie. not to restart all at once?
[5:53] <doppelgrau> theanalyst: upgrade the first mon, restart that, second mon .. , upgrade and restart the osds on the first node, ???
[5:54] <doppelgrau> theanalyst: exactly
[5:55] <theanalyst> doppelgrau: planning to do something like that... we have puppetized most of deployment, so planning to coordinate phased service restarts :-)
[5:57] <theanalyst> doppelgrau: ie. upgrading osds node by node etc. is it recommended to set the flag still?
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[5:58] <doppelgrau> theanalyst: I think it depends, with only a short dontime planed it shouldn???t be necessary
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[5:58] <edrian> I have cleaned the osd tree, completely removing the osds that were out already
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[5:59] <doppelgrau> theanalyst: so it???s a tradoff between the risk of data movement if an osd doen???t start till you have a chance to investigarte and the risk that a failure goes undetected
[6:00] <edrian> doppelgrau: I know having a big host with all the osd on it is a bad idea but I have to deal with it. I'd rather like it to have more hosts with few disks than that big server with 30 disks in it...
[6:00] <theanalyst> doppelgrau: thanks. I'll possibly not set the flag & try stabilizing the cluster bit by bit bofore moving to the next node then
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[6:01] <edrian> and it is getting even more messier if it was possible: https://pastebin.mozilla.org/8841180 :D
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[6:02] <doppelgrau> edrian: can/should also remove the empty hosts and change the failure domain in the crush-rule
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[6:08] <lurbs> http://ceph.com/docs/master/rados/operations/crush-map/#editing-a-crush-map <-- Show how to edit the map.
[6:09] <lurbs> If you want to move from your failure domain being hosts, to being OSDs, you'd change the 'chooseleaf' line(s).
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[6:09] <lurbs> Then, when you have sufficient hosts (of about the same capacity), you could change it back. That would cause significant data movement, though.
[6:10] <m0zes> well worth it, though.
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[6:10] <lurbs> Failure domain of hosts is a *lot* nicer, yes.
[6:12] <lurbs> Personally I'd not put into production anything using chooseleaf OSD.
[6:15] <doppelgrau> lurbs: I agree. the disadvantages of an distributed system (latencys, memory consumption ???) with the disadvantages of a local raid + lvm (host down service down)
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[6:30] <edrian> ok, I will try to edit the crush map
[6:30] <edrian> thank you for the help guys!
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[10:45] <Be-El> are there any restrictions on ec pool with cache frontend for cephfs? e.g. operations that are not supported yet?
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[10:54] <doppelgrau> Be-El: no Idea, but simple test ist? http://marc.info/?l=linux-fsdevel&m=120717468905606&w=2
[10:54] <doppelgrau> run once on replicated and once on ec+cache
[10:55] <Be-El> doppelgrau: i already have the setup and everything seems to work fine....but some files only contain zeros
[10:55] <Be-El> doppelgrau: and i'm not sure whether this is a cephfs problem or an application problem
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[10:57] <doppelgrau> Be-El: sorry, can not help you in that case. just using cephfs on a replicated pool with very litle IO => no real problems till now (just a few MB configuration files that should be available everywhere)
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[12:15] <kees_> if, in a 3 node ceph cluster, 2 nodes die - can you reconfigure the remaining node so that you can access your data (even if readonly)?
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[12:20] <doppelgrau> kees_: assuming size=3, yes
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[12:21] <doppelgrau> kees_: assuming the majority of monitors have surveived or manual manipulation of the monmap
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[12:22] <kees_> probable manual manipulation, we are researching storage for our servers that are split over 2 locations, and what would happen if one location died (fire, flood, etc)
[12:24] <doppelgrau> kees_: you cann afford a loss of <size -1> failuredomains (default node/server) and you need at least one surveiving monitor
[12:25] <doppelgrau> kees_: you could create crush-rules that places copies on both locations
[12:29] <kees_> ok, so it is technically possible to 'restart' the surviving location in case of a catastropic loss of the other location if the hardware is correctly balanced between the locations and the correct configuration
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[12:30] <doppelgrau> kees_: yes, but you have to pay attention to the configuration, at least one copy must be placed on the surviving site
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[12:31] <kees_> that sounds logical ;)
[12:32] <doppelgrau> kees_: the problem is, the default ruleset usually does not ensure this since the failure domain is server, so with 4 servers on each site and size=3 all three copies could be on one site ...
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[12:33] <kees_> we aren't even close to building the cluster yet, but i'll keep that in mind
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[12:39] <Be-El> kees_: it might also be a good idea to place a monitor instance at the third site (e.g. 2 in dc1, 2 in dc2, 1 offsite)
[12:40] <Be-El> kees_: with that setup you always have a monitor quorum if one datacenter is offline
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[12:48] <kees_> good idea, might be able to arrange a third location with a decent internetconnection
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[15:11] <dimir> hi. Quick question. I only need to test something on a ceph filesystem. So I need it mounted anywhere on my machine and perform some tests. But going through documentation gave me the impression that I need multiple hosts in order to have it mounted somewhere.
[15:13] <dimir> As I understood at least 3 hosts (could be virtual machines) for cluster, monitor, admin or whatever and only then I can have mount something to my box using cephfs.
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[15:13] <dimir> Is there a way to not perform a full set-up and just have some block formatted with cephfs and mount it?
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[15:16] <m0zes> cephfs is a network filesystem, akin to nfs. except much more distributed. you will need a ceph cluster with two pools. you *can* do it all on one host for testing something, but it won't be fast, and it is a bit of work.
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[15:21] <burley> and by it won't be fast, m0zes means it will be really realy really slow
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[15:26] <jcsp> dimir: nothing forces you to have multiple servers if you just need to mount a quick test instance
[15:27] <jcsp> use a pool with size=1 so that it doesn't try to spread replicas across hosts
[15:27] <jcsp> and only create a single mon
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[15:27] <jcsp> but please don't use this for anything serious, especially anything involving performance.
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[15:32] <dimir> Thank you guys.
[15:32] <dimir> Yes, I only need to test something. The thing is, it was reported that a certain utility is reporting incorrect inode information on Linux on an cephfs filesystem.
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[15:33] <dimir> So I only need to reproduce it. Mount something as cephfs to my box and run my utility.
[15:34] <dimir> I have compiled the ceph packages for my Debian stable box.
[15:34] <dimir> $ dpkg -l '*ceph*' | grep ^ii | awk '{print $2,"\t",$3}'
[15:34] <dimir> ceph 9.0.2-1
[15:34] <dimir> ceph-common 9.0.2-1
[15:34] <dimir> [...]
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[15:35] <dimir> And I'm sorry, I'm competely new to ceph. So, what was again I must do if I'd like to set up everything on my box and just have cephfs on my box?
[15:36] <dimir> I'm OK with bad performance.
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[15:38] <jcsp> dimir: it's, uh, not like one command :-)
[15:38] <jcsp> I usually use the ceph-deploy tool
[15:38] <dimir> right.
[15:38] <dimir> It actually didn't compile here.
[15:39] <jcsp> you don't need to compile it, we release packages
[15:39] <dimir> I mean, from the repo the created packages did not have it.
[15:39] <dimir> ah
[15:39] <jcsp> you could also try loicd's script: http://dachary.org/?p=2374
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[15:39] <jcsp> (which was one of the google hits for "single node ceph cluster", there are various other approaches)
[15:40] <dimir> wow, this looks wonderful.
[15:40] <dimir> I must give it a try.
[15:41] <dimir> So, this does not require any additional boxes? Everything on one box? I wonder if it's enough also to have just one network interface with 1 IP?
[15:42] <dimir> And I wonder if there is a possibility to screw something on my box. :-D
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[15:43] <dimir> damn, this script was posted 2 years ago, might be outdated.
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[15:47] <dimir> Hmm, got an error: http://pastebin.com/GjRwEsZD
[15:48] <dimir> I can't get any idea from the error messages.
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[15:55] <Optimus__> am I supposed to upgrade librbd1 on my hypervisor nodes as well (running openstack) after upgrading ceph
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[16:32] <dimir> jcsp: any idea what could I do in order to pass that error?
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[17:06] <burley> dimir: Is the volume you are using for the OSD big enough to have that size journal on it?
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[22:05] * Aid (~Adium@c-76-127-54-42.hsd1.nm.comcast.net) has joined #ceph
[22:05] <Aid> Hey
[22:06] <Aid> Does anyone here use erasure coding on ceph?
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[22:07] * m0zes
[22:07] <Aid> What schema have you used?
[22:07] <Aid> (m,k)
[22:09] * fdmanana (~fdmanana@bl13-153-19.dsl.telepac.pt) has joined #ceph
[22:16] <m0zes> 8,4
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[22:28] <Aid> Nice, have you done any kind of benchmarking?
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These logs were automatically created by CephLogBot on irc.oftc.net using the Java IRC LogBot.