#ceph IRC Log

Index

IRC Log for 2014-07-29

Timestamps are in GMT/BST.

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[0:10] <dmick> jobewan: you mean query the daemons' defaults? no, not ceph-deploy, but you can see them with ceph-conf
[0:11] <jobewan> ok, I had just noticed after running through the install that my config file doesn't look anything like most of the ones I see. There aren't any osd declarations
[0:12] <dmick> yes, there don't need to be
[0:14] * dspano (~dspano@rrcs-24-103-221-202.nys.biz.rr.com) Quit (Quit: leaving)
[0:15] <dmick> daemon instances are discovered by virtue of their presence in /var/lib/ceph
[0:15] <dmick> and/or GPT partition types spawning off jobs to mount filesystms
[0:15] <dmick> (the latter through udev)
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[5:25] <Jakey> hi
[5:25] <Jakey> i am getting this error
[5:25] <Jakey> https://www.irccloud.com/pastebin/VREStk7X
[5:26] <Jakey> is there are performance difference for using a directory rather than an entire disk for OSD?
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[6:07] <bens> filesystem overhead
[6:19] <Jakey> this is not for like massive public cloud
[6:19] <Jakey> do you think its okay
[6:19] <Jakey> and i'm getting this error now
[6:20] <Jakey> https://www.irccloud.com/pastebin/VVggvmpp
[6:22] * Fetch (fetch@gimel.cepheid.org) Quit (Read error: Connection reset by peer)
[6:23] <bens> its fine for testing
[6:23] <bens> i think you are using ceph-deploy wong but I can't figure out how
[6:24] <bens> what did you do to get that error
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[9:42] <dignus> on C6 the dir /var/lib/ceph/bootstrap-osd/ doesn't exist IIRC
[9:42] <dignus> I had to manually create it
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[12:39] <sz0> hi. we just lost ~20TB of disk. is there a way to stop recovery?
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[13:09] <classicsnail> set noout?
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[13:24] <sz0> it was already set but didn't help. we'll try to survive until free space lasts
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[17:43] <interruptor> hi.. maybe the answer is obvious... but is is there any possibility to track down which VM causes most iops or which rbd image is accessed most? I'm afraid there's something strange going on here with peaks about ten times higher than average :(
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[17:48] <ganders> anyone have the .deb packages for calamari? i'm having some issues while trying to run the vagrant on the gits
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[19:45] <thiago> Hi ! Can anyone help me solve this?
[19:45] <thiago> # mount -t ceph 192.168.0.1:6789:/ /mnt/mycephfs -o name=admin,secretfile=/etc/ceph/ceph.client.admin.keyring
[19:45] <thiago> secret is not valid base64: Invalid argument.
[19:45] <thiago> adding ceph secret key to kernel failed: Invalid argument.
[19:45] <thiago> failed to parse ceph_options
[19:46] <thiago> # cat /etc/ceph/ceph.client.admin.keyring
[19:46] <thiago> [client.admin]
[19:46] <thiago> key = AQAN2NdT8EbZOhAA1MslN0b1/c1EDrwABEUSbQ==
[19:47] <thiago> I can't to mount my CephFS
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[19:48] <thiago> But
[19:48] <thiago> mount -t ceph 192.168.0.1:6789:/ /mnt/mycephfs -o name=admin,secret=AQAN2NdT8EbZOhAA1MslN0b1/c1EDrwABEUSbQ==
[19:48] <thiago> Work's fine
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[19:50] <kitz> thiago: secret vs. secretfile?
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[20:04] <thiago> kitz: Yes
[20:04] <kitz> ah, I see. I'm not sure. I usually rbd map then mount the /dev/rbd device.
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[20:09] <kitz> with rbd map i pass --id which then assumes /etc/ceph/ceph.client.<id>.keyring and it gets picked up just fine.
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[20:09] <thiago> hmm... I understand
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[20:33] <ganders> is there any chart or graph with perf results from benchs? i want to know if my bench numbers are relatively good or not, i'm using 7 physical servers, 3 dedicated to MON and 4 for OSD, each running 2 SSD for OS in raid1, 3 SSDs for Journal, each running 3 OSDs in SAS
[20:34] <ganders> all of the servers are connected to 10GbE, on the public network, and the OSD servers are connected to 10GbE on a dedicated SW, with MTU 9000
[20:34] <ganders> for rados bench i'm getting almost 300MB/s on seq writes, and almost 1Gb/s on reads
[20:34] <ganders> it's an empty cluster
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[20:36] <bens> rados bench is goot for functionality testing
[20:36] <bens> but i have found it doesn't match reality.
[20:36] <ganders> bens: yeah that's correct, since i try a dd on a server also at 10GbE and map a rbd and i'm getting no more than 200MB/s
[20:36] <ganders> that's pretty low value for perf on a 10GbE net
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[20:37] <bens> what if you run more than one?
[20:38] <bens> dd isn't a great tool either
[20:38] <bens> i like to copy sparse files.
[20:38] <ganders> also try fio and the numbers is very close, with a bs of 64k and 16 threads
[20:38] <bens> open a file, seek 100mb, write it out. Then rbd copy it. See how long it takes
[20:38] <ganders> sorry *are very close
[20:39] <bens> help me with your units
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[20:39] <bens> 10gb and you are getting one gigabyte/s reads?
[20:39] <bens> that is spot on.
[20:39] <ganders> yeah but again..with rados bench :D
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[20:39] <bens> those numbers seem right
[20:40] <bens> fio is good too
[20:40] <ganders> yeah, i will also try vdbench and see how it goes
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[20:59] <ganders> found this page with a nice bench-rados perf test and also some pretty good numbers...
[20:59] <ganders> http://www.spinics.net/lists/ceph-devel/msg08458.html
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[21:06] <darkfader> ah, thats the fujitsu guy
[21:06] <darkfader> mr. highperf
[21:07] <darkfader> this in the 1st reply seems interesting: filestore queue max ops = 10000
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[21:13] <burley> darkfader: Did you get a chance to gander at the SSD test results IOPS issue I was having (kinda similar to the spinics post above)?
[21:13] <burley> you asked for some data which I provided here: http://pastie.org/private/uqdifav1cpar7qdlsyuatg
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[21:13] <darkfader> i'll check it now
[21:14] <darkfader> i didn't see it and we hacked on the xen support last weekend
[21:14] <darkfader> so, only in a few vms nothing benchmarkish
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[21:15] <darkfader> reading
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[21:16] <kitz> uh. version 0.80.5?
[21:17] <burley> 0.80.1
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[21:17] <kitz> burley: sorry. I just did an apt-get update && apt-get dist-upgrade on my Ubuntu 14.04 machine and it 404'd on 0.80.5 packages.
[21:18] <kitz> I haven't heard anything about 0.80.5 yet though.
[21:18] <darkfader> burley: what i see there is: single ssd tops out at 96/24 and against the rbd you get 64/16 (MBytes/s)
[21:18] <darkfader> so you're having around 30% overhead
[21:19] <burley> I was watching the iops counts, but either way
[21:19] <darkfader> i think that's realistic - that the numbers aren't >100MB/s is the big problem
[21:19] <burley> we have 36 drives in the cluster
[21:19] <darkfader> what replica number do you have?
[21:19] <burley> so the rbd performing at less than any of those individual drives would seem like a problem
[21:19] <burley> 3
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[21:20] <darkfader> i'm no guru on the striping tricks you can pull nowadays
[21:20] <burley> those tricks require using the fuse module though
[21:20] <darkfader> but i'd expect max. of 3x single disk speed for reads and 1x single disk speed for write
[21:20] <darkfader> do they?
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[21:21] <burley> yes
[21:21] <darkfader> i'm sorry, you'll need to ask who has tinkered more, especially more recently
[21:21] <burley> I was thinking 2-3x single disk performance as expectation
[21:21] <darkfader> i can tell from the sar it's not hitting any bottleneck on the disk end
[21:21] <jiffe> so following http://ceph.com/docs/master/start/quick-ceph-deploy/ I am at the part where I'm adding a second monitor, running 'ceph-deploy mon create test-ceph8' it fails with this output http://nsab.us/public/ceph
[21:22] <burley> and we're at ~75% of a single disk
[21:22] <burley> any suggestion for who I should direct this to better in channel?
[21:22] <darkfader> i'd pester nhm
[21:22] <darkfader> i don't dare to do it more than once a year
[21:22] <burley> thank you
[21:22] <darkfader> but still, right person
[21:28] <darkfader> i'm looking for some info about sharing ssds between cache pool and journal
[21:28] <darkfader> like, what the performance hit is for both
[21:29] <burley> I assumed 50%
[21:30] <burley> so my back of napkin assumed 6 writes in total for every write made
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[21:30] <burley> 3 for replication, and another 2 for the journal and final write of each
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[21:30] <burley> and then some for overhead
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[21:32] <thiago> Using CephFS in a cluster with 3 nodes: Are 100% of the data present in each node ?
[21:32] <thiago> Like a RAID1...
[21:32] <saturnine> Anyone know why I might be seeing this?: " can't store user info, swift id () already mapped to another user"
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[21:32] <darkfader> thiago: only if you set it to replicated 3 times :)
[21:32] <ganders> darkfaber: i dont know how he could get those numbers... i mean same tests and instead of 795MB/s.. im getting 320MB/s
[21:32] <saturnine> trying to create a swift key for a subuser
[21:33] <darkfader> ganders: you can read his ceph day frankfurt presentation
[21:33] <darkfader> he got a lot higher speeds via infiniband
[21:34] <darkfader> but it's multiple pcie ssds in the test
[21:34] <darkfader> my guess is he's building the next gen of "the fujitsu hosting cloud"... i just plan to sit in awe, not to get those numbers :)
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[21:36] <ganders> darkfader: do you had the link to the present?
[21:37] <darkfader> burley: do you still have it
[21:37] <darkfader> it was a pita to find
[21:38] <burley> let me see if I have logging enabled :)
[21:38] <burley> I do not
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[21:38] <darkfader> my irssi is misconfigured and just does the away log
[21:38] <darkfader> idk why :)
[21:38] <burley> darn new machine and forgot to enable local irc logging
[21:38] <thiago> darkfader: Could you tell me some literature on this?
[21:39] <darkfader> i'll dig for the pres
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[21:40] <darkfader> http://www.inktank.com/cephdays/frankfurt/
[21:40] <darkfader> the 10:30 one
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[21:40] <darkfader> the key was to look for frankfurt (few hits) not ceph (ETOOMANY)
[21:40] <ganders> thanks darkfader, i will check it out
[21:40] <thiago> In Ceph documentation I have not found abount 100% mirroring
[21:41] <darkfader> thiago: just look for replication count
[21:41] <darkfader> default is 2, that means like a raid1 of two disks. and you want the (one in each node) so you need a count of 3
[21:42] <darkfader> and then you need to look for "crushmap" so you can tell ceph it should distribute evenly (but in that case it'll be rather automagic i think)
[21:42] <saturnine> ah that's a problem
[21:42] <darkfader> what you gotta avoid is having three copies on the first node and none on the others
[21:43] <saturnine> apparently radosgw-admin subuser create isn't populating .users.swift
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[21:45] <thiago> darkfader: Thank you. I'll study better. For me so far it looked like RAID5
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[22:10] <burley> I see reference to changing the OSD object size in the frankfurt talk above, hunting for that config option but coming up empty -- anyone know what he's referring to?
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[22:28] <mongo> so is there no way to use rbd and erasure coding on ubuntu 14.04 right now?
[22:29] <mongo> frustrating that you can't even have erasure pools on the cluster at all and have rbd work even for replicated pools
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[22:37] <dmick> mongo: that last sounds wrong
[22:37] <dmick> I'm a little behind on ec but that restriction seems quite surprising
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[22:42] <ganders> also he/quit
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[22:42] <mongo> yep, it is quite suprising but any kernel pre-firefly will have this error when trying rdb map "[ 4998.035116] libceph: mon2 10.3.11.203:6789 feature set mismatch, my 4a042a42 < server's 104a042a42, missing 1000000000
[22:42] <gregsfortytwo1> we changed that behavior with a firefly point release
[22:42] <mongo> and that is even attaching to a non ec pool, just the default rbd pool.
[22:42] <gregsfortytwo1> it should work now
[22:43] <ircolle> mongo - what version are you runing?
[22:43] <mongo> I have the latest packages from deb http://ceph.com/debian-firefly/ trusty main
[22:43] <mongo> so 80.1
[22:44] <ircolle> O_o - hrm
[22:44] <gregsfortytwo1> v0.80.2, v0.80.3???v0.80.5?
[22:44] <mongo> err 0.80.4-1trusty
[22:44] <jiffe> Do not run multiple metadata servers in production.
[22:44] <gregsfortytwo1> hrm
[22:45] <janos> that's what "ceph --version" prints out?
[22:45] <jiffe> that seems like something I would definitely want to do in production
[22:46] <gregsfortytwo1> jiffe: you can run hot standby MDSes, but should not run multiple actives at this time
[22:46] <mongo> ceph version 0.80.4 (7c241cfaa6c8c068bc9da8578ca00b9f4fc7567f)
[22:46] <rweeks> gregsfortytwo1, is that going to change anytime soon?
[22:47] * rweeks seems to recall that was the same MDS guidance from 2012...
[22:47] <gregsfortytwo1> mongo: oh, I think that feature bit is the crush tunables v2 one, not the erasure coding one
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[22:47] <jiffe> gotcha, http://ceph.com/docs/master/rados/deployment/ceph-deploy-mds/ probably needs some updating I'm guessing then
[22:47] <gregsfortytwo1> rweeks: well, we've got a renewed emphasis on the filesystem, but multiple actives hasn't moved to the top of the list yet
[22:47] <rweeks> ok, just curious. :)
[22:48] <ircolle> jiffe - "There is experimental support for running multiple metadata servers. Do not run multiple metadata servers in production."
[22:48] <mongo> gregsfortytwo1: the rbd device I am trying to map is v1 irrc
[22:48] <gregsfortytwo1> ircolle: so a distinction between active and standby-replay would be good in that page
[22:48] <dmick> "pull requests accepted" :) :)
[22:48] <gregsfortytwo1> mongo: the format isn't the issue; it's how the data is placed
[22:49] <ircolle> dmick - +1 :-)
[22:49] <gregsfortytwo1> if you dump the crush map I think it'll say what tunables it's using
[22:49] <mongo> hrm...OK, i'll go dig in, but something is broken. This cluster is a new install from the 28th
[22:50] <mongo> using ceph deploy.
[22:50] <gregsfortytwo1> mongo: yep, it defaults to using new crush tunables that require kernel v3.13 or something
[22:50] <gregsfortytwo1> you can instruct it to use older rules that will be supported by older kernels if you like; search for "crush tunables" in the docs and/or release notes
[22:51] <mongo> OK, it would be nice if it was still deployed in a usable state, I'll look into it though, I think I had to do this about a year or so with my other cluster for other reasons.
[22:52] <mongo> note I am on 3.13, so it would require 3.14 which is in no dists right now IIRC
[22:56] <mongo> the only line added is " "item_name": "default"},
[22:57] <mongo> in the replicated_ruleset, compaired to my emporor cluster. I'll delete the ec pool and ruleset first.
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[23:01] <mongo> deleting all ec pools and running " ceph osd crush rule rm erasure-code" fixed it, so there is another regression if it is expected to be fixed in 0.80.4
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[23:04] <sz0> i have posted this earlier today but i need some help. is there a way to stop an ongoing recovery? we have lost ~20TB of disk and experiencing some heavy load. i have already tried set noout. it didn't have any effect
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[23:18] <sz0> some osds that are causing issues are logging fault reconnections and a stack trace https://gist.github.com/szkl/0375622033105cd60992
[23:22] <mongo> OK I see the 80.5 packages in the repos this afternoon, I'll blow away the cluster and recreate to see if it is still an issue.
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[23:36] <gleam>
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[23:40] <mongo> nope, same behavior, fresh install, create ecpool, create rbd device on default rbd pool then try rbd map
[23:41] <mongo> any ec pool on the cluster breaks all current production OS support for RBD.
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[23:48] <jiffe> so if I already have a metadata server and run `ceph-deploy mds create metadata2` will it create the new metadata server as active or standby?
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[23:52] <gregsfortytwo1> <momentary drop-in before going afk>I *think* it will be a standby as ceph-deploy generally doesn't change those sorts of settings, and the MDS (unlike OSDs) will not automatically oin the cluster as a new daemon</drop-in>
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[23:56] <mongo> OK, opening an issue now that I have replication steps.
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