#ceph IRC Log

Index

IRC Log for 2014-06-27

Timestamps are in GMT/BST.

[0:04] <iggy> I'm going to go with no
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[0:05] <iggy> You'll hear it loud and proud when ceph is finally suitable for cross-DC use
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[0:07] <Sysadmin88> due to bad performance or due to everything falling apart?
[0:08] <dmit2k> Reading throuh different ceph optimization advices I often see a recommendation to turn off explicit logging in production env. But what exactly produces extra overhead?.. Generating the logs itself or writing them to th filesystem? Say if I configure remote syslog, would that help?..
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[0:17] <iggy> dmit2k: a little of both
[0:18] <iggy> probably more so the actual logging, but even with remote logging, you're going to be opening network sockets, sending packets, etc...
[0:19] <iggy> Sysadmin88: due to people don't want to wait 1/4 of a second for writes to complete
[0:22] <s3an2> I seem to have hit an assertion failure in rbd.c that is causing a kernel panic, the logs report 'rbd_assert(img_request != NULL);' I am running a stock ubuntu 3.13 kernel - Joshd has said that it was mitigated in 3.14.5, and should be entirely fixed in 3.16, I am just trying to see how it was mitigated.
[0:22] <kraken> http://i.imgur.com/H7PXV.gif
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[0:24] <iggy> s3an2: see what joshd replied to you earlier
[0:25] <s3an2> mispost, thanks
[0:28] <iggy> oh, I see you changed part of your post... There weren't a lot of rbd commits for 3.14.5, so it should be pretty easy to track down
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[1:00] <athrift> We have been running with just the noatime XFS mount option for around a year now, I just added inode64 option and gained 1000 IOPS for free. Pretty nice option that
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[1:20] <Anticimex> nice
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[2:24] <iggy> that seems odd. that shouldn't impact performance
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[2:26] <sherry> hi guys, I'd like to reiterate this bug, appreciate if u have any idea> http://tracker.ceph.com/issues/8641
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[2:55] <iggy> there's a Dev conference going on right now iirc, it seems like you are getting pretty good response to your issue... at least to the point that you don't need to paste it in the channel
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[3:34] <Nats_> athrift, oh? my ceph setup seems to default to noatime and inode64
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[3:53] <athrift> Nats_: Our install is pretty old, pre ceph-deploy
[3:53] <athrift> Nats_: I still cannot get ceph-deploy working in a sane way
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[7:58] <longguang> hi
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[7:59] <longguang> who could tell me the callflow of storing a file?
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[8:14] <longguang> where to find file_object_t?
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[9:23] <longguang> how to calculate pgs?
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[9:27] <Vacum> longguang: try to end up with roughly 100 pg replicas per OSD. so its (#OSDs * 100) / replicasize , but also make sure to make the PG number 2^N. so if the formula results in ie 4000, make it 4096
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[9:32] <longguang> thanks
[9:33] <longguang> do you know how to map a object to a pg?
[9:33] <longguang> and how to assign a pg to a osd? where is the code?
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[9:46] <longguang> Vacum:how to check there are how many pgs in a pool?
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[9:46] <longguang> health HEALTH_WARN 128 pgs degraded; 256 pgs incomplete; 256 pgs stuck inactive; 384 pgs stuck unclean ;
[9:46] <Hell_Fire_> longguang: ceph osd pool get pg_num
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[9:47] <Hell_Fire_> pools can have a ruleset assigned to them, rulesets are defined in the crush map and can specify specific buckets to store objects into, buckets contain osds at the lowest layer
[9:47] <longguang> great.
[9:48] <Hell_Fire_> sorry, ceph osd pool get <pool> pg_num I should say
[9:49] <longguang> why in my case, it is not health_ok? what is the peoblem? i have 1mon.1mds,2 osds. all run on the same node.
[9:50] <Hell_Fire_> how many replicas on the pool have you got set? defaults to 3 (ceph osd pool get <pool> size (and min_size))
[9:50] <longguang> it is my first time to hear of buckets . is the any document???
[9:50] <longguang> i set 2 for all of them. min_size is 2.
[9:51] <Hell_Fire_> also, the default crush rule sets the allocation level for replicas to host as a bucket, which means it'll want to try to store across osds on at least <size> hosts
[9:51] <Hell_Fire_> http://ceph.com/docs/master/rados/operations/crush-map/
[9:52] <longguang> the host option in ceph.conf decides if it is a bucket?
[9:53] <Hell_Fire_> nah, option in ceph.conf you want is "osd crush chooseleaf type", but those settings only apply at the time of pool creation (when the cluster is initialized)
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[9:58] <longguang> now i have no data. can i do that? only 3 default pools stand there.
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[10:01] <Hell_Fire_> sure, I've got a script to do the deployment/teardown, but I think you can just create a new monmap, and do ceph-mon --mkfs etcetc with your monitor to blow away the map
[10:02] <Hell_Fire_> possibly have to rm your /var/lib/ceph/mon/mon.<hostname> folder too, but not sure if that's absolutely needed or not
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[10:09] <longguang> how to know fsid?
[10:09] <Hell_Fire_> you generate one with uuidgen
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[10:11] <longguang> my environment is down. i need to re-iniitialize it.
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[10:16] <SpComb> is there some procedure for migrating a public-network-only cluster (with 1 mon and 6 osd-hosts) to a split public/cluster-network cluster?
[10:17] <SpComb> and then eventually move the public network over as well
[10:17] <longguang> now mon is running. if i need to rm mon's data directory?
[10:21] <longguang> ceph-mon --mkfs --mon-data /opt/ceph/mona --id a --fsid 039904aa-1947-4df5-82a8-ae7c3780c913 ; /opt/ceph/mona already exists
[10:22] <Hell_Fire_> SpComb: I believe you can, not recommended though, as you have to be routable between your public and cluster network (there's a note under ceph deamons on http://ceph.com/docs/master/rados/configuration/network-config-ref/ about this)
[10:22] <Hell_Fire_> longguang: yeah, you'll probably have to rm /opt/ceph/mona first
[10:24] <longguang> then? osd crush chooseleaf type
[10:25] <Hell_Fire_> set your ceph.conf first
[10:25] <Hell_Fire_> the initial pools get created as part of the initial monmap
[10:26] <SpComb> Hell_Fire_: I mean, I'm running the cluster on, say, vlan1 10.1.0.0/16 now - and I want to move it over to vlan3 10.3.0.0/16
[10:26] <longguang> then? restart cluster?
[10:26] <SpComb> Hell_Fire_: I have the interfaces etc set up on the nodes already... what do I do to move ceph over?
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[10:27] <Hell_Fire_> well, don't quote me on this, since I'm still only mucking around with mine in testing, but should be able to set your new nodes as in on the cluster, and gradually set your old osds out and they should backfill across
[10:30] <longguang> SpComb:i think you only need to modify addr options/
[10:31] <longguang> osd crush chooseleaf type = 0?
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[11:15] <cabrillo> hi
[11:15] <MACscr> can I start with a replica of 2 with only 2 ceph nodes and then migrate it to a replica of 3 with 3 nodes? my third node is at my colo and i dont have it here locally for testing.
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[11:16] <cabrillo> quit
[11:16] <cabrillo> exit
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[11:19] <cabrillo> Hi, I am trying to prepare/activate 3 osds (Xen VMs), And alway get the same error in the activate stage, the prepare works fine (create 2 partition on disk xvdb1 for data (90GB) and xvdb2 for journal (10GB))
[11:19] <cabrillo> ceph-deploy --verbose osd activate ceph02:xvdb1:/dev/xvdb2
[11:20] <cabrillo> ERROR: error creating empty object store in /var/lib/ceph/tmp/mnt.D9xNVt: (2) No such file or directory
[11:20] <cabrillo> filestore(/var/lib/ceph/tmp/mnt.D9xNVt) mkjournal error creating journal on /var/lib/ceph/tmp/mnt.D9xNVt/journal: (2) No such file or directory
[11:20] <cabrillo> Any help is welcome
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[11:47] <longguang> what does 'up ([1,0], p1)' p1 mean?
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[11:49] <amaron> On Ceph filesystem page there is a warining that FS is not currently recommended for production data
[11:49] <amaron> Does it mean it's not production ready, or something else?
[11:49] <longguang> yes
[11:50] <amaron> So it's now in some beta stage or similar?
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[11:52] <amaron> How far is it from being production ready?
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[11:54] <longguang> not sure.
[11:57] <rendar> is ceph a kernel mode filesystem, or usermode?
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[12:00] <amaron> rendar: I think it's usermode
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[12:01] <longguang> it has a kernel module, but you need to build by yourself.
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[12:05] <rendar> longguang: i see
[12:08] <longguang> i have 2 mons. but only one works when use ceph-fuse to mount.
[12:08] <rendar> i ask this because i saw a 'ceph' directory in linux/fs
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[12:09] <longguang> yes. it seems that there are few work done on it
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[12:10] <longguang> you better look at the code, and do some work
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[12:13] <cabrillo> Any idea?
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[12:53] <Hell_Fire> amaron: it's not production ready only because the multi-mds stuff isn't ready/heavily tested
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[13:03] <longguang> where to download ceph-fuse source code? i wang to debug
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[13:09] <Hell_Fire> looks like it here: https://github.com/ceph/ceph/blob/master/src/client/fuse_ll.cc
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[13:20] <longguang> strace ceph-fuse -m 192.168.18.131:6789 /opt/mceph ; it hangs
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[14:04] <longguang> hi
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[14:39] <magicrobotmonkey> is it possible to take an osd thats been running with a journal and start running it without one?
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[14:43] <longguang> i can mount only when on the same node.
[14:44] <longguang> if using another mon address, it hangs.
[14:45] <longguang> something is waiting futex lock in kernel.
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[15:32] <alfredodeza> cabrillo: ping
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[15:39] <magicrobotmonkey> lets say i want to remove an osd, how do i tell the cluster to start moving data off of it?
[15:40] <magicrobotmonkey> is it just setting it to out?
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[15:45] <Vacum> magicrobotmonkey: you can adjust its weight to 0.0 first. or even go in smaller steps, so the rebalancing will be slower
[15:46] <magicrobotmonkey> ok cool
[15:46] <magicrobotmonkey> luckily this is just a POC cluster
[15:46] <magicrobotmonkey> but I think i have a raid card on its way out, so I'm trying to let the osds behind it die as gracefully as possible
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[16:47] <longguang> key for client.admin exists but cap mds does not match
[16:47] <longguang> how to handle it?
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[16:56] <sage> longguang: mds cap doesn't match how?
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[16:59] <longguang> sage: i launch 'ceph-fuse -d -m 192.168.18.131:6789 /opt/mceph -c /etc/ceph/ceph.conf', but it hangs . i find the error in ceph-client.admin.log
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[17:00] <sage> can you pastebin ceph auth list ?
[17:00] <sage> the mds cap string should be just 'allow'
[17:01] <longguang> yes. it is allow.
[17:01] <longguang> maybe the auth is right.
[17:01] <sage> is the mds up? what does ceph -s say on the mds: line?
[17:01] <longguang> do you know the reason of the hang.
[17:01] <longguang> yes
[17:01] <longguang> 1/1/1 up {0=a=up:active}
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[17:02] <longguang> i have 2 mons. if the mon address assigned in ceph-fuse is not local , the mount operation will hang.
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[17:03] <sage> but it works if you use the other mon?
[17:04] <longguang> sage:please look at the link. https://dpaste.de/mgFd
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[17:04] <longguang> yes.
[17:05] <sage> it looks like there isj ust a connectivity issue between your client and the other mon. you probably can't ping or telnet to port 6789 from teh devlong host
[17:07] <longguang> iptables is down. and two osds is up and in.
[17:07] <longguang> telnet 192.168.18.131 6789 ; it output 'ceph' string.
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[17:09] <longguang> sgae:would you like to look at the kernel call stack?
[17:10] <longguang> https://dpaste.de/tO88
[17:13] <longguang> sage: if few work are done on cephfs . i notice there are a few update on ceph-client kernel code.
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[17:24] <sage> hmm, it could be also that the monitor clocks are out of sync, perhaps?
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[17:27] <longguang> sage: great , how do you know. health HEALTH_WARN clock skew detected on mon.b
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[17:28] <sage> longguang: i don't think the problem is related to ceph-fuse. you proably will see a similar error if you do 'ceph -s -m <ohermon>'
[17:28] <sage> ha cool
[17:28] <longguang> sage: i have corrected it before.
[17:28] <longguang> it recurs
[17:28] <longguang> why?
[17:29] <longguang> but the time is same.
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[17:29] <longguang> Fri Jun 27 23:28:58 CST 2014
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[17:32] <longguang> how to solve it?
[17:32] <longguang> sage:hi
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[17:34] <sage> install ntpd
[17:34] <sage> for quick fix, run ntpdate on both hosts
[17:40] <longguang> sage: i have private messages for you. haha
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[18:59] <devicenull> hmm, after a networ koutage I'm seeing "e17 not in monmap and have been in a quorum before; must have been removed"
[18:59] <devicenull> on a few of my monitors
[19:01] <devicenull> ah, fixed it
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[19:07] <MACscr> can I start with a replica of 2 with only 2 ceph nodes and then migrate it to a replica of 3 with 3 nodes? my third node is at my colo and i dont have it here locally for testing.
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[21:44] <blynch> has anyone seen the error "ERROR: can't get key: ret=-2" in radosgw? I just posted on the mailing list, but I thought I'd ask here as well
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[22:09] <MoepMan> hi, after inital setup ceph -s shows this "health HEALTH_WARN 342 pgs incomplete; 342 pgs stuck inactive; 342 pgs stuck unclean
[22:10] <MoepMan> any idea what I did wrong?
[22:11] <blynch> how many OSDs are up?
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[22:12] <MoepMan> blynch: osdmap sais that 3/3 are up
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[22:13] <MoepMan> http://pastie.org/private/pkauikdkvwbikwew2jg full ceph -s output
[22:17] <blynch> MoepMan: Are you using replication and num-replicas=3 for your pools?
[22:19] <JCL> Verify the weight of your OSDs using ceph osd tree also
[22:21] <MoepMan> JCL: weights or all OSDs are 1
[22:23] <MoepMan> blynch: I use the default settings, what I did was basically ceph-deploy osd --zap-disk create host:device and pool create datastore 150
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[22:27] <JCL> How are your OSDs deployed. 3 on the same server or one on 3 servers?
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[22:30] <blynch> MoepMan: i'm not familiar with ceph-deploy... If it sets the failure domain to be the host, that could be an issue.
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[22:31] <janos> default failure domain for ceph has been host for eons
[22:31] <MoepMan> JCL: 3 different servers (3 VMs because I want to get started with ceph before using any real hardware), I just walked through this really easy looking tutorial with ceph-deploy
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[22:40] <blynch> MoepMan: is there any firewall between these VMs?
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[22:42] <MoepMan> blynch: nope and the can all ping each other; should I remove my OSDs (since ceph -s shows anyting else working) and start over with http://ceph.com/docs/master/start/quick-ceph-deploy/#adding-an-osd ??
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[22:46] <blynch> MoepMan: sounds like a reasonable plan
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[22:55] <MACscr> can I start with a replica of 2 with only 2 ceph nodes and then migrate it to a replica of 3 with 3 nodes? my third node is at my colo and i dont have it here locally for testing.
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[23:00] <MoepMan> blynch: it works now; maybe that tutorial I used was out of date or something
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[23:03] <blynch> MoepMan: well I'm glad it's working for you now
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[23:54] <iggy> MACscr: you can start with replica of one if you want
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