#ceph IRC Log

Index

IRC Log for 2015-05-22

Timestamps are in GMT/BST.

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[5:18] <edrian> Hi Ceph chan!
[5:19] <edrian> I've recently been told about Bareos File Deamon compatible with Ceph to backup the rados objects.
[5:19] <edrian> did any of you play with that here?
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[6:44] <tomc> Massive rbd-fuse performance regression in hammer?
[6:44] <tomc> I know rbd-fuse is not necessarily widely used, but we use it to mount file systems inside of format 2 RBDs as.. the kernel client doesn???t support that feature
[6:45] <tomc> with hammer rbd-fuse seems to be 50-100 times slower at doing anything than it was in firefly
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[6:48] <tomc> just running fdisk against an rbd-fuse rbd takes a good 20-30 seconds to open the interactive shell???
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[6:48] <tomc> and performs over 10,000 iops to the cluster
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[7:17] <Nats> not that it helps your issue, but fwiw kernel client can use format 2 if kernel is new enough
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[7:37] <tomc> ok, how new?
[7:38] <tomc> The docs still indicate it is completely unsupported
[7:38] <tomc> and I know as of 4 months ago it was trivially easy to kernel panic the client box :)
[7:39] <tomc> at least with the latest ???prebuilt??? kernel for ubuntu from their kernel ppa
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[7:58] <Nats> i run ubuntu 12.04 with their trusty kernel
[7:59] <Nats> and routinely rbd map format 2 images for very limited usage
[7:59] <Nats> adjust partition table, resize partition, that kind of thing
[8:00] <Nats> it was supported as of 3.11 (the saucy kernel from ubuntu pov)
[8:01] <Nats> i've never encountered a kernel panic in over a year, but (again) my usage is very limited; i rbd map, make some minor change, and unmap it right away again
[8:02] <Nats> you are right though, it is flagged as experimental so YMMV
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[8:09] <lexb> Why does ceph-disk create a GPT (GUID Partition Table) with one Partition on it? If only one partition is needed one could use the whole physical device without any partitioning. So I am wondering, what is the motivation/intention of ceph-disk creating a GPT?
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[8:34] <lexb> Found the answer, ceph-disk leverages GPT to be able to use udev to automatically start OSDs for partitions marked with a ceph OSD UUID.
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[8:46] <raw_> lexb, yes, correct.
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[9:01] <Be-El> hi
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[9:28] <AtuM> hello. What can I do when OSDs report 98% full and dropping all updates - I have a small testing rbd pool.. I was copying an image on it without checking free space first.. trying to delete the file gets stuck.
[9:29] <AtuM> Could adding an OSD help at this point?
[9:30] <AtuM> It's a test setup, so no data loss at this end.. I'm just exploring the possibilities.
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[9:43] <Be-El> AtuM: more space (either resizing the existing osd or adding a new one) should help
[9:48] <T1w> are there any reccomendations regarding queue depth for OSDs?
[9:48] <T1w> or.. for the OSDs controller for the data disks
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[9:57] <AtuM> can ceph work over infiniband nativelly?
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[10:05] <raw_> is it a good idea to use ceph's omaps/leveldb for huge quantities of key/value pairs?
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[10:29] <kblin> hi folks
[10:30] <kblin> my cephfs setup keeps going into a degraded state pretty much every time I'm trying to do some disk IO
[10:31] <kblin> it seems like I'm running into a performance bottleneck somewhere. any hints on how to debug this?
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[11:18] <jcsp1> kblin: what do you mean by degraded state?
[11:18] <AtuM> kblin, classic linux tools.. iostat, iptraf,..
[11:19] <jcsp1> raw_: if you mean putting huge quantities of key-vals in a single omap, then no (because each omap is only on a single OSD)
[11:20] <jcsp1> raw_: in general if you have key value data you might just want to store objects where the object name is the key
[11:21] <jcsp1> raw_: if you have tiny values, you might be interested in something like this http://ceph.com/papers/CawthonKeyValueStore.pdf
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[11:35] <raw_> jcsp1, by single omap you mean putting many key/values on a single rados object right? how about having 1 million of objects with each having 10k key/value pairs on them? would that work to scale?
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[11:38] <jcsp1> raw_: sure
[11:38] <jcsp1> at least, I'm not aware of any issues with it
[11:38] <jcsp1> 10k might be the number you have to tune there
[11:38] <jcsp1> and what is "too big" for a single omap object may depend on the backing store in use
[11:39] <jcsp1> was 10k a random pick there btw? because it's also the cephfs default max size of a directory fragment omap before we split it :-)
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[11:41] <raw_> jcsp1, yes, almost random. 10k worked good with ceph_omapbench
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[11:56] <AtuM> I'm reading about adding OSDs to a cluster. can i just use ceph-deploy to add a node?
[11:58] <jeroen_> yeah
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[12:31] <absbang> hi everyone... can someone help me regarding an issue with rados gateway?
[12:31] <absbang> apologies if i'm not abiding by any channel rules by posting this
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[12:47] <smerz> absbang, i'd suggest explaining your issue
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[12:55] <absbang> thank you smerz for the response. I have deployed a rados gateway and connected it to the cluster. The problem i'm facing is that when I create an s3 user with all the permissions and connect to it using an s3 compatible client, I'm able to create a bucket or folders but unable to copy anything to it
[12:56] <smerz> i have zero experience with the gateway or the object store itself. I hope someone else does. But there are no interessting error messages on the gateway or the ceph cluster right ?
[12:59] <absbang> Yeah. No messages that would be triggered when i start copying. I'm not well versed myself and the troubleshooting online regarding object storage is very limited
[12:59] <absbang> that's why i came here
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[13:05] <smerz> your gateway has the right cephx credentials right ?
[13:05] <smerz> i'm not sure. its like a key or something hehe
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[13:07] <bangs> yeah. The gateway's part of the cluster. i have the admin keyring and the gateway keyring placed as well
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[13:07] <bangs> with rwx permissions for osd and mons
[13:09] * smerz dunno's sorry
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[13:14] <absbang> has anyone else faced this problem before?
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[13:42] <hellertime> does cephfs have the concept of user and group file permissions?
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[13:47] <smerz> it's posix compliant
[13:47] <smerz> so it should have the same as ext3/4 xfs and the like
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[13:49] <hellertime> the file attributes are stored in the mds?
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[13:57] <smerz> not sure. tbh
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[14:00] <hellertime> ok. I'll dig. I am playing with cephfs-hadoop and it seems to just disregard permissions entirely??? I thought it was just a display thing, but I can create a file as one user and delete it as another...
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[14:37] <jcsp1> hellertime: I don't know if we have test coverage for HDFS's permissions on top of cephfs, but we would certainly like to know if it's broken. The underlying filesystem does indeed support normal UID/GID UNIX permissions.
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[14:38] <jcsp1> you should be able to mount a normal cephfs client as well as your hadoop system, and use that normal client to see what the permissions are like on the files hadoop created
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[15:12] <m0zes> the hadoop default permissions model is terrifying
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[15:30] <mich123> I'm trying to import a raw image into my cluster with qemu-img convert. But the write speed is very low (+-300kB/s).Does someone has an idea if this is normal or how I could fine tune my cluster?
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[15:33] <jeroen_> mich123, what happens when you just wget a binary file?
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[15:34] <mich123> jeroen_, its not the network I tested it with iperf and everything is ok
[15:35] <jeroen_> I dont want to know the network speed, I want to see what the write speed is ;)
[15:36] <bangs> does anyone know any good windows compatible s3-client that can be configured for radosgw?
[15:36] <bangs> forget good... any will do
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[15:38] <jeroen_> @bangs: http://lists.ceph.com/pipermail/ceph-users-ceph.com/2013-May/020776.html
[15:38] <cephalobot> jeroen_: Error: "bangs:" is not a valid command.
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[15:39] <mich123> write speed is ok wget gives me >1500 MB/s (which is my max internet speed)
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[15:40] <jeroen_> maybe the qemu-img convert is single threaded and cpu bound?
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[15:41] <m0zes> if it is a raw image, you should just be able to run 'rbd import'
[15:46] <bangs> thanks jeroen for the reply. Can you kindly tell me the configuration used for any of the clients (dragondisk, s3browers etc)?
[15:46] <bangs> i've tested it using s3cmd but i'm unable to write data using dragondisk
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[15:47] <bangs> although it shows the buckets and i can copy the files from the account
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[15:52] <jeroen_> I dont know bangs :(
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[16:10] <zviratko> any idea whether one can upgrade an OSD (say from dumpling to firefly) and then rollback it and keep data?
[16:12] <zviratko> (assuming I don't use any new features, keep it frozen in the meantime)
[16:20] <smerz> afaik one is supposed to update the monitors first. (not sure if you did that already)
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[16:53] <primechuck> Through an act of error, someone removed the client.admin permissions for mon....is there a way to add back permissions?
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[17:19] <ganders> hi all, I've an issue with a node of my ceph cluster.. i just rebooted and then the osd's never come back auto.. so, i do a "sudo ceph-osd -c /etc/ceph/ceph.conf -i 0 --mkjournal" and everything looks just fine "created new journal /mnt/journal/ceph-0-journal for object store /var/lib/ceph/osd/ceph-0"
[17:20] <ganders> but then i issue a "sudo start ceph-osd id=0" and then it never come up.. i check in the /var/log/ceph/ceph.osd.0.log file but it doesn't show anything
[17:20] <ganders> any idea? ceph v0.82
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[17:24] <smerz> well you should definitely get output why it's not coming up. either in the stdout/stderr or the process starting and if configured definitely in the logs
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[17:27] <zviratko> smerz: yeah, i know, but new monitors are actually able to speak to "old" osds (or at least I hope I understood it correctly) and monitors are simpler than my osd nodes - since they also run compute/kvm
[17:28] <zviratko> smerz: i'm just thinking of a rollback scenario and that would involve downgrading osds should something only go bad on the compute nodes
[17:28] <zviratko> (without involving cold backup preferably, since that's pretty disruptive)
[17:29] <smerz> i haven't done this myself yet. so i'm a bit conservative about giving advise. as far as i know you should be able to downgrade the ods's yes. but i'd definitely get a second opinion on this and of course test it in a test environment as well
[17:30] <zviratko> we obviously won't just simply upgrade production, but there are always issues you only hit in prod, so... better be prepared for the worst
[17:30] <smerz> indeed
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[17:44] <ganders> smerz: http://pastebin.com/raw.php?i=4cJApa58
[17:44] <ganders> take a loot at that
[17:44] <ganders> when i issued the start ceph-osd command, nothing is showed on the log file
[17:44] <ganders> also doing a ps -ef | grep ceph doest not display the process
[17:46] <smerz> maybe it cannot register at the monitor or something? i'm not sure
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[17:48] <ganders> smerz: http://pastebin.com/raw.php?i=76cznnzu
[17:48] <ganders> ok this is something different
[17:49] <ganders> but.. the path /var/lib/ceph/osd/ceph-0 actually exists
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[17:51] <smerz> well i couldn't say anything aside of that
[17:52] <smerz> aside of whats in that log. perhaps a permissions issue or something?
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[17:53] <ganders> smerz: mmm let me check that up
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[18:10] <ganders> mmm well i got some of the osd daemons running :)
[18:10] <ganders> but... one of them get really crush... so i took it out of the cluster... and then try to remove /var/lib/ceph/osd/ceph-0/ directory.. but fails to delete some dirs
[18:11] <ganders> then i try to run ceph-osd -i 0 --mkfs but fail with this nice error: http://pastebin.com/raw.php?i=ZG7g7ZBK
[18:11] <ganders> any ideas anyone?
[18:11] <ganders> i would need to re-create that particular osd daemon, the rest are up and running ok
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[19:04] <raw_> is this normal on btrfs? [idbi3][WARNIN] 2015-05-22 17:02:29.812703 7fc9d160f880 -1 journal FileJournal::_open: disabling aio for non-block journal. Use journal_force_aio to force use of aio anyway
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[19:37] <ganders> raw_: in this case yeah it's normal
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[19:59] <rlrevell> is there no way to add an osd with a specific ID anymore? the method listed in http://ceph.com/docs/master/rados/operations/add-or-rm-osds/ doesn't work anymore
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[19:59] <rlrevell> i am just trying to get the mountpoint, OSD id, and crush map in sync again after apparently deleting the wrong thing
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[20:03] <rlrevell> ceph osd create insists on using the next free number, but when I activate the OSD it thinks its ID is a different one.
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[20:15] <rlrevell> nvm i was looking at http://ceph.com/docs/master/rados/operations/add-or-rm-osds/ while i should have been looking at http://ceph.com/docs/master/rados/deployment/ceph-deploy-osd/. not sure why there's 2 separate guides ;-)
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[20:27] <daviddcc> Hi
[20:27] <daviddcc> do you think it is normal for CPU Intel C2550 Either 100% to only 25MB / sec (randwrite bs = 32k) ?
[20:28] <daviddcc> With only one OSD
[20:28] <daviddcc> Heuu no, 2 OSD with local replication
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[20:30] <daviddcc> (Intel C2550 = 4 core, no HT, 2,4Mhz [2Mo])
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[21:46] <ShaunR> anybody help with removing a ceph fs... every time i get 'all MDS daemons must be inactive before removing filesystem'
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[22:58] <pvh_sa> hey... is there any advantages to using btrfs for the OSD fs instead of xfs?
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[23:22] <mtanski> http://ceph.com/docs/master/rados/configuration/filesystem-recommendations/
[23:23] <mtanski> so really snapshots for RBD
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