#ceph IRC Log

Index

IRC Log for 2015-05-04

Timestamps are in GMT/BST.

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[0:39] <loicd> fattaneh: there is no need to repeat the question more than once a week. If you want to be sure it stays, you should consider sending a mail.
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[2:26] <dustyw> Is there such thing as too many snapshots of an RBD image? Any performance reason to keep the number of snapshots low?
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[3:23] <loganb> hi all, I was wondering if people had any experience installing calamari
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[3:24] <loganb> I have a ceph cluster that is setup, I am not sure how to best provide proof that it is setup
[3:25] <loganb> but the calamari webclient sees that I have 3 ceph clusters connected
[3:25] <loganb> it just won't show the fsid when I ask the django rest framework
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[3:32] <loganb> GET /api/v2/cluster/my-fsid HTTP 404 NOT FOUND Vary: Accept Content-Type: text/html; charset=utf-8 Allow: GET, DELETE, HEAD, OPTIONS
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[3:45] <loganb> all of my salt-minions are up and the keys are accepted
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[4:35] <knight> Hi,geeks. I have a ceph cluster for rgw service in production, which was setup according to the simple configuration tutorial, with only one deafult region and one default zone. Even worse, I didn't enable neither the meta logging nor the data logging. Now i want to add a slave zone to the rgw for disaster recovery. How can i do this, influencing the service in production the least ?
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[9:54] <anorak> hi
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[9:57] <anorak> I am having a strange problem with a ceph block device (30 GB capacity). when issued the command "df -h", it shows that 20G is being utilized whereas checking the block device with "du -lahc", it shows only 4 GB utilization. Any hints from where this irregularity is coming? This device is mounted like a normal NFS mount point.
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[10:31] <SpaceDump> anorak: I suppose you have used 30GB earlier, removed some data and now only use 4GB? trim is the answer I think. :)
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[11:04] <s3an2> anorak: maybe check for deleted open files `lsof | grep -i deleted`
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[11:32] <anorak> Spacedump/s3an2: Problem solved! I restarted the application which was using the block device. Not sure how it was clinging to some old files ( I could not see them with any commands)
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[11:33] <anorak> but thanks both! :)
[11:35] <SpaceDump> np. :)
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[14:42] <T1w> if I've got a log of objects stored in cephs object storage - how can I take a backup of them without retrieving and handling metadata (attributes, key/value pairs etc) by hand?
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[15:24] <disc> Hi all. Question. While my initial ceph.conf consisted of one monitor and two osds...using ceph-deploy, i expanded my ceph cluster. But the ceph.conf (on every server) does not reflect the present ceph cluster consistingof 25 osds and 5 monitors.
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[15:24] <disc> so...how can I update or "fetch" my present ceph.conf which reflects the present cluster?
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[15:30] <alfredodeza> disc: you can 'push' the new config to the servers with ceph-deploy
[15:30] <alfredodeza> ceph-deploy has a `ceph-deploy config push {nodes}`
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[15:32] <jeroenvh> Anyone familiar with drops in ceph performance? I get around 400 iops (randwrite, 4k, sync, depth=1) but every now and then (20 - 60 secs) it drops to 0-70 iops
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[15:33] <jeroenvh> slow commits are either "commit sent" or "reached_pg"
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[15:39] <disc> alfredodeza: so this will "overwrite" the "initial" ceph.conf with the "actual" ceph.conf...right?
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[15:43] <georgem> jeroenvh: it's probably caused by your journals stopping to flush to disk
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[15:44] <T1w> noone got an idea as how to back up a lot of objects to a backup system?
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[15:47] <jeroenvh> georgem: is the flushing from the journals to the disks async or sync?
[15:47] <disc> alfredodeza: on second thought, it will push the configuration to a ceph node....i guess it should be "pull"...no?
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[15:54] <alfredodeza> disc: yes, it will overwrite if you force it to do so
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[15:54] <alfredodeza> otherwise it will complain unless the 'forcing' flag is on
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[16:02] <georgem> jeroenvh:the journals stop accepting new writes during the flush, so it's sync
[16:05] <disc> alfredodeza: thanks! :)
[16:05] <alfredodeza> no problem
[16:05] <smerz> georgem (i'm a colleague of jeroen's. he went home.) thanks for those answers, that explains a lot! :-) appreciated your help
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[16:07] <georgem> smerz: welcome, there could be other reasons for the drop in iops but this is a major one, and you can monitor with iostat looking at the journal partition and the osd partition for a minute or more
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[16:08] <smerz> no that answer makes perfect sense. I'm gonna verify it now but it fit's the picture/situation very well
[16:08] <smerz> for example. we put journal on ramdisk for testing purposes
[16:09] <smerz> but we thought the flushing from journal to disk was asynchonously so we didn't expect any io related stalls on synchronous random 4k writes
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[16:10] <Elwell> Hi All, trying to install giant onto RHEL7.1 but it's failing with dependency errors - Requires: libleveldb.so.1()(64bit). is there some other repo I need to enable?
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[16:11] <Elwell> https://bugzilla.redhat.com/show_bug.cgi?id=1182802 looks similar
[16:12] <alfredodeza> Elwell: that is for something else I think
[16:12] <alfredodeza> Elwell: have you enabled the RH channels? (subscription manager stuff)
[16:13] <alfredodeza> also, how are you attempting the install? via what repo? with/without ceph-deploy?
[16:14] <Elwell> alfredodeza: rhel-7-server-rpms/7Server/x86_64 and the ceph ones via ceph-release-1-0.el7.noarch
[16:14] <Elwell> by hand for now so I understand what ceph-deploy achieves later (test cluster on VMs)
[16:15] <alfredodeza> Elwell: have you activated your subsriptions?
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[16:16] <Elwell> yeah (and its done a big yum update on them) - I only have RHEL, not the storage manager subscription, hence why using ceph rather than their packaged version of it
[16:17] <Elwell> subscription-manager status: Overall Status: Current
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[16:23] <smerz> georgem, quick test shows that you're probably 100% spot on! thanks
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[16:25] <Elwell_> rats. bounced connection.
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[16:56] <peeejayz> Afternoon all, anyone having problems with Cephfs and random files/folders will dissappear? and then appear?
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[17:28] <gregsfortytwo> peeejayz: that's a (set of) bug(s) in older kernel clients; I don't have any references handy for it though
[17:28] <peeejayz> w
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[17:31] <peeejayz> gregsfortytwo: I'm on RHEL7 so I guess that is to do with them no back importing stuff just yet?
[17:32] <peeejayz> Do you know if nodcach solves it? Or will I just have to make upstream kernel mobules to get it to work?
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[17:45] <ron-slc> hello, I'm seeing a situation on Firefly 80.9, where a RBD image + snapshots were deleted while a participating OSD was down (not out). Upon bringing osd back up, logs are showing crash related to objects which were deleted.
[17:46] <gregsfortytwo> peeejayz: I think there are backports coming eventually, but raw RHEL7 doesn't have them, yeah; it was an issue with the local caching and lookup of dentries but I don't know what options might impact it (you could try); and we're generally still at the point where running the latest kernel is a good idea if you're using cephfs
[17:46] <gregsfortytwo> or just grab the userspace ceph-fuse ;)
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[17:49] <cmdrk> mds0: Client 74135 failing to respond to cache pressure
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[17:49] <cmdrk> Can anyone explain this error message?
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[18:06] <cmdrk> more importantly, any way to debug "failing to respond to cache pressure"? this is 0.94.1
[18:06] <cmdrk> or if i could find out which client is 74135, that'd be useful
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[18:10] <peeejayz> gregfortytwo: I'm kinda stuck in RHEL7 currently. I have a 8node cluster reliant on cephFS for home directories :( its not to bad, I'm hoping RH will give me backports soon. but I'm not holding my breath until they class it as production - they have only just put rbd kernel modules in!
[18:10] <peeejayz> It would be so bad, if I could build the modules myself,but all of the building stuff is so out of date the newwer clients won't build correctly.
[18:10] <peeejayz> And well fuse is fuse... mega slow
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[18:11] <cmdrk> peeejayz: depending on your stance on custom kernels, you could use kernel-ml from ELRepo
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[18:11] <peeejayz> this is something I might have to think about.
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[18:13] <Be-El> is ceph-fuse really that much slower than the in-kernel implementation?
[18:13] <cmdrk> ive been rolling my own kernels based on the 3.18.x LTS series on my el6 machines with CephFS. ben working out nicely
[18:13] <cmdrk> s/ben/been
[18:13] <peeejayz> I was maxing out at 150mb, and kernel is over 1gbps
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[18:15] <peeejayz> cmdrk: is that using the latest ceph-client master?
[18:16] <cmdrk> peeejayz: you mean the Ceph kernel branch on github?
[18:16] <cmdrk> i'm actually just using 3.18.x from kernel.org
[18:17] <peeejayz> ah okay, I might I had the expertise to do that, I've never looked at building my own kernels YET.
[18:17] <peeejayz> do you have any problems with files/folders just randomly dissappearing on that version?
[18:17] <cmdrk> nope
[18:17] <cmdrk> i did have that problem before, though
[18:17] <cmdrk> AFAIK it was fixed in 3.12-ish?
[18:17] <peeejayz> interesting, sounds like what I might need to do.
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[18:20] <peeejayz> I'm a Windows admin, and only just taken over Linux in the last year, so this question will probably come across as really stupid to you
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[18:20] <peeejayz> If I update the kernel, will this only change drivers and applications shouldn't be affected?
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[18:21] <cmdrk> right, in general applications should not be affected.
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[18:23] <cmdrk> i am trying to think of a case where that's not true, but i'm not coming up with any. i think it's fairly safe to do
[18:24] <cmdrk> now, if you're on RHEL proper (as opposed to CentOS or Scientific Linux, say), i'd imagine they will not support such a configuration
[18:24] <Be-El> does redhat support custom kernels?
[18:24] <peeejayz> Yea, we only use some specific scientify apps on these machines.
[18:25] <peeejayz> Be-El: redhat dont, but this is becomming to big of a problem currently for us, people keep saying all of my files are missing ect
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[18:26] <cmdrk> peeejayz: how is performance with CephFS as /home? i've thought about doing it, but i've had trouble with users who put zillions of small files in directories
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[18:26] <peeejayz> so far its been great when files arn't dissappearing
[18:26] <peeejayz> I have 60tb of home dirs currently
[18:26] <peeejayz> Alot of our files are 300mb+ generated by the users
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[18:27] <peeejayz> but ofc we have sessions files and they seem fine
[18:27] <peeejayz> 8256 pgs, 3 pools, 57417 GB data, 15736 kobjects
[18:27] <peeejayz> is my current stats
[18:28] <cmdrk> cool
[18:29] <peeejayz> the only problem with speed has been with HDF5 file writing
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[18:44] <Be-El> peeejayz: using cephfs for home directories does not sound like a good idea. cephfs may be resilent, but it is also comparable slow (especially with respect to iops)
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[18:45] <Be-El> peeejayz: i've a similar setup here, with home directories on standard nfs server, and data on extra volumes on cephfs
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[18:46] <peeejayz> Be-El, generally our users don't write stuff in there home dir - also we are trying to not have a SAN based storage attached to this - its extra cost.
[18:47] <Be-El> peeejayz: so it's a more non-interactive setup?
[18:47] <peeejayz> It is, but we have general working areas for them , which is where there data is generally saved too.
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[18:48] <Be-El> ah, ok.....my users would start a rampage if i were to put their homes on cephfs ;-)
[18:48] <peeejayz> Really why? We have no speed issues at all, and I have 350 users on it.
[18:49] <peeejayz> The working areas are even in the same cephfs pool.
[18:49] <Be-El> the work stations use the home directories directly. and modern desktop environments do a lot of small file operations
[18:50] <peeejayz> Yea, ours is a data analysis cluster. I have 5 48core, 512gb memory systems attached to it.
[18:51] <peeejayz> Each user can either SSH or get a visual desktop over nomachine into it.
[18:52] <Be-El> that's similar to our setup for external users. the internal ones have a roaming home directories on the nfs server
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[18:52] <peeejayz> Yea we don't do any roaming home dirs, this is only for people on the analysis nodes.
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[19:39] <alphe> hello I run into some problemes with ceph-deploy for last ubuntu vivid vervet
[19:40] <alphe> ceph-deploy mon create <my machine> does a call to initctl which is part of upstart-sysv packages which was replaced in ubuntu 15.04 by systemd
[19:41] <alphe> is there a new version of ceph-deploy that takes into account that factor
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[19:44] <alphe> anyone about ceph-deploy ?
[19:45] <off_rhoden> alphe: there is no current version of ceph-deploy that supports systemd on Ubuntu. I don't think there has been much in the way of focusing on Vivid yet
[19:45] <off_rhoden> as upstream Ceph only supports/packages Precise and Trusty
[19:45] <off_rhoden> but if there is not a bug filed about it, there certainly should be.
[19:45] <alphe> suposedly on ubuntu 15.04 I should be able to use both upstart and/or systemd but in reality if I try to install upstart apt-get yell at me that systemd replaced it
[19:46] <alphe> trusty is old stuff ...
[19:46] <alphe> trusty still runs with kernel old that have no fix for most of the problemes in cephfs and rbd
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[19:47] <alphe> rbd problem is the forever growing replicas since xfs trim isn t supported on rbd kernel modules
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[19:49] <alphe> cephfs problem is the lost folder tree when it is used at the same time with nfs
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[19:50] <alphe> both problems are really annoying and are only solved since kernel 3.18
[19:50] <alphe> and you can t expect to get that kernel in the trusty lts ... any time soon
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[19:54] <alphe> but lets be pragmatic if there is no support for systemd then I should implement it
[19:54] <alphe> I need to find the equivalent to upstart initctl emit <service> <config params>
[19:55] <alphe> if anyone has clues ...
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[19:56] <alphe> ok seems like I can downgrade ubuntu 15.04 to upstart apt-get insall upstart
[19:57] <alphe> then at kernel init scripts you set init=/sbin/upstart
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[21:04] <loicd> guerby: could you please remind me the URL of the Ceph workshop you're organizing next month ?
[21:04] <guerby> loicd, http://capitoul.org/
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[21:07] <loicd> thanks I registered
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[23:17] <Stevec> I'm looking to set up a four node Ceph system with each node having 12 5TB disks, two SSD's for cache and Two SATA-DOM (Disk on Modules) for booting. The Sata-DOM's are only 64 GB. Is this likely to be a problem?
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[23:20] <Stevec> Also, would 64 GB of RAM be cutting it to close on this system? 12 OSD's per node each OSD with 5 TB?
[23:21] <alram> ccccccdhuecugdndhkhihhkghgkhbccvrrfthteckntk
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[23:25] <Stevec> I'll try again. Is 64 GB too small for OS drives for Ceph nodes?
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[23:51] <Anticimex> the rule of thumb is 1GB per OSD + 1 GB per TB of data, I believe
[23:52] <gregsfortytwo> there's no per-data amount of RAM required, it's just 1-2GB per daemon, assuming reasonable PG counts
[23:52] <Anticimex> which ends up at 72GB for 12*5
[23:52] <Anticimex> ok
[23:52] <gregsfortytwo> and more caching is always better ;)
[23:52] <Anticimex> then some old inktank sizing pdf is incorrect ;)
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[23:53] <Anticimex> so memory pressure during recovery is throttleable or similar?
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[23:53] <Anticimex> one ceph operator in here had a interesting OSD memory utilization graph with history from like version C or D or so
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[23:53] <Anticimex> structs be growing :)
[23:54] <gregsfortytwo> memory usage can be pretty variable, it's just "amount of data" is definitely not one of the inputs ;)
[23:54] <gregsfortytwo> PG count is one of the inputs
[23:54] <Anticimex> ack
[23:54] <Anticimex> i suppose it's more complex than sizeof(struct pg*) as well
[23:54] <Anticimex> but it could be that * $factor
[23:55] <Stevec> How about disk space for the OS? Would 64GB be too little for the OS? I'll have the two SSD's also. but the SATA-DOM's are limited to 64 GB
[23:55] <gregsfortytwo> yeah, more than that, although you'd be better trying to apply that fit than one to the amount of data ;)
[23:55] <gregsfortytwo> at least once you actually had data in the pool
[23:57] * yanzheng (~zhyan@171.216.95.141) has joined #ceph
[23:58] <flaf> cmdrk: sorry for my later remark, you said that you use the 3.18 kernel with CephFS and it works fine. Could you give me some info please? Is 3.18 for the clients or the cluster nodes? In fact, could you tell me: your kernel version and your OS in the client nodes and in the cluster nodes please?
[23:59] * mwilcox (~mwilcox@116.251.192.71) has joined #ceph

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