#ceph IRC Log

Index

IRC Log for 2015-05-13

Timestamps are in GMT/BST.

[0:00] <Anticimex> i'd like to be able to turn of read caching to support running a cluster filesystem between VMs on multi-mounted RBD volumes
[0:00] <Anticimex> such as GFS2
[0:02] <Anticimex> http://comments.gmane.org/gmane.comp.file-systems.ceph.devel/22306 does at least say there is a working mode for doing the multiple-mount
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[0:07] <joshd> yes, qemu sets rbd's caching options based on what you tell it to do on a per-disk basis
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[0:09] <Anticimex> thanks
[0:10] <Anticimex> I did expect that - but the documentation is unspecific about this ( http://ceph.com/docs/master/rbd/qemu-rbd/ )
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[0:35] <cholcombe> ceph: anyone know what perms are required on the client key for a python rados client to connect to the cluster?
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[6:03] <lxo> if you pinged me or otherwise mentioned my nick in the past ~5 months and I didn't respond, it's because xchat was hiding highlighted messages from me, due to a buggy plugin. that should be fixed now. my apologies. thanks for jxself for figuring out when messages didn't reach me, which led to the solution
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[8:13] <treenerd> Hi; Is there someone who is using btrfs in a production environment as filesystem for the OSD's? Whats your experience with it. I would like to use it with ubuntu 14.04 3.13 kernel and ceph hammer.
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[8:17] <gleam> i've been burned a bit by it, between fragmentation and sort of random bugs
[8:17] <gleam> on that same release/kernel
[8:17] <gleam> it might be better on the hwe/utopic kernel but i haven't tried
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[8:21] <nigwil> 30PB Ceph cluster at CERN: http://cds.cern.ch/record/2015206/files/CephScaleTestMarch2015.pdf?version=1
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[8:28] <Vasily> hi guys, i have a question
[8:29] <Vasily> i have a Ceph cluster with 9 OSD among 4 nodes
[8:30] <Vasily> when i write to mapped rbd image and reboot one of the nodes - there is a write freeze for about a 30 seconds
[8:30] <Vasily> this is enough for ext4 filesystem to switch to read-only
[8:31] <Vasily> is it possible to somehow minimize the lag? I've tried to lower osd timeouts but without luck
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[8:39] <T1w> mornings
[8:40] <Vasily> hi
[8:40] <Vasily> is there any Ceph guru down here? )
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[8:42] <Vasily> pity
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[8:43] <T1w> if I define a crush map and specify some bucket types and at some later point in time decide to modify those buckets and the entire hierarchy - will that result in a major replace of almost all data?
[8:43] <T1w> .. and is it advisable to do that or am I shooting myself in the foot?
[8:44] <Vasily> i did it many times and yes - the whole bunch of data will start moving
[8:44] <T1w> ok
[8:44] <T1w> I assumed so, but you might never know
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[8:45] <Vasily> also it is important to check your map before injecting
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[8:45] <T1w> what do you mean?
[8:45] <Vasily> like you forget to define one ruleset which is needed by one of the pools
[8:45] <T1w> ah
[8:46] <Vasily> you inject the crushmap - and the whole cluster is going down
[8:46] <Vasily> i've also faced that
[8:46] <T1w> doh
[8:46] <T1w> ok
[8:46] <T1w> sound like good advice.. :)
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[9:01] <treenerd> gleam: thank you for the information; that was also our experience with btrfs but we didn't use the filesystem with ceph. In our usecase we will provide the ceph storage for virtualization. So I also think XFS is the better solution with hammer and 3.13 kernel at the moment.
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[9:19] <Be-El> hi
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[9:27] <anorak> hi
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[10:25] <JohnPreston78> Hi everyone
[10:25] <JohnPreston78> I have a 2 monitors cluster.
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[10:25] <JohnPreston78> I have simulated a down of one of them doing a simple `service ceph stop`
[10:26] <JohnPreston78> after that, I could simply not run any commands
[10:26] <JohnPreston78> ceph health was ending in some kind of timeout
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[10:27] <JohnPreston78> is there something specific to configure to have all monitors in active/active that will handle failure of one of the monitors
[10:27] <JohnPreston78> I could miss ?
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[10:33] <Be-El> JohnPreston78: you need a quorum to run a cluster (> 50% of all mons)
[10:34] <Be-El> JohnPreston78: with one of two mons down your cluster cannot form a quorum
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[10:34] <JohnPreston78> Be-El: Ok, that's what I thought from the reading of the doc
[10:35] <JohnPreston78> so if I have 3 Mons, 2 up 1 down, I have it working fine ?
[10:35] <Be-El> JohnPreston78: yes, 3 mons is ok with one mon down
[10:35] <JohnPreston78> Be-El: Alright, fair enough. Makes sense
[10:36] <JohnPreston78> Be-El: thanks :)
[10:36] <JohnPreston78> I will add a monitor in my VMWare stack that lies next to my Cloud
[10:36] <JohnPreston78> and shut one down :)
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[11:08] <n00b> complete n00b here
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[11:11] <n00b> I've been reading on ceph, but I keep getting technical info. At this point, I just need a very high level - very basic understanding of what happens when something goes wrong with a physical disc
[11:11] <n00b> could someone help me with that please?
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[11:12] <anorak> n00b: depends what kind of cluster you are running with how many replication factor
[11:12] <Hydrar> Just wondering, do I need a [mon.a] section if I have mon host = in the [mon] section?
[11:12] <anorak> n00b: in general, when any of your disk go down, some pgs are lost
[11:13] <anorak> noob: but if you have a replication factor of atleast 2 and you replace the faulty hard disk, then your data will be restored
[11:14] <n00b> I assume there is a performance penalty?
[11:15] <anorak> noob: good practice is to have a separate network for cluster and for public access to your ceph
[11:15] <n00b> ok
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[11:15] <anorak> if there is enough bandwidth on your cluster network, and depending upon how much data was lost...you can sort of guess :)
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[11:17] <n00b> anorak: I'm actually looking at starting to play with it, I was trying to figure out what the best setup would be
[11:17] <n00b> anorak: thank you for your help
[11:18] <anorak> noob: well...you can start with one mon, two storage nodes to get the hang of it. But I am not sure how you are intending to use ceph .e.g. CephFS, block storage etc
[11:18] <anorak> noob: your welcome!
[11:19] <n00b> anorak: no idea! I just stumbled on it, and loved the idea.
[11:20] <anorak> noob: even one storage node will be enough with e replication factor of 1 (I would highly recommend this only for testing...replication factor=1)
[11:20] <n00b> anorak: so I made up my mind to make it the storage I will use for all setups.
[11:20] <anorak> n00b: I use it as a block storage. Many users in this chat room use it as an object storage and ceph fs.
[11:21] <n00b> anorak: well, I want to set it up to learn to avoid data loss actually
[11:21] <anorak> n00b: in case you need help with block storage, i would be happy to assist.
[11:21] <n00b> i don't mind throwing some hardware at it
[11:22] <anorak> n00b: if you dont have any strict requirements, you can start with block storage then to avoid data loss.
[11:22] <n00b> anorak: thank you very much
[11:22] <n00b> how would I set that up?
[11:22] <n00b> i just need rthe concepts, I'll do the reading and set it up
[11:22] <n00b> i havent read the documentatioin yet
[11:23] <n00b> I mean, most of it
[11:23] <anorak> n00b: there is a nice documentation on ceph.com to get you started... http://ceph.com/docs/master/start/
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[11:23] <anorak> n00b: this will get you started
[11:24] <n00b> anorak: I'm reading it. I was just wondering things along the lines of how many drives, how many pcs, things of that nature...
[11:24] <n00b> anorak: to avoid data loss all together
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[11:25] <n00b> anorak: without raid right?
[11:26] <anorak> n00b: yes. without Raid.
[11:26] <n00b> anorak: perfect
[11:26] <n00b> just what i thought
[11:26] <n00b> anorak: what would be the right setup?
[11:27] <n00b> that would meet the minimum requirements?
[11:27] <n00b> i.e. how many drives, how many pcs, things of that nature...
[11:27] <anorak> n00b: for testing, one mon , one storage node having atleast 2 separate hard disk...one hard disk for the OS, one for the OSD
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[11:28] <anorak> n00b: for production...3 or 5 mons, two or more storage nodes with same configuration (one drive for OS and the rest for OSDs)
[11:29] <anorak> n00b: ceph users also use ssd drives for journal performace...but i do not have that right now.
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[11:31] <n00b> anorak: with the production setup you're suggesting, how many drives loss will the system survive?
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[11:33] <n00b> assuming a 1-OS 1-OSD 2 drives nodes
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[11:34] <anorak> n00b: let's say you have a 100 TB ceph cluster with replication factor of two. This means that you can save up to approx. 50TB of data with the rest serving as backup. This implies that your ceph cluster can survive 50TB of hard disk loss in general but not 100% GAURANTEED SINCE IT DEPENDS ON HOW THE PGS HAVE BEEN DISTRIBUTED
[11:34] <anorak> n00b: sorry for the caps lock
[11:34] <anorak> :(
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[11:35] <anorak> again, i am not that much of an expert but that is my understanding. someone here can correct me if i am wrong on this.
[11:35] <n00b> What would the best distribution be for this purpose?
[11:36] <anorak> n00b: didn't get you.
[11:36] <n00b> the PGs distribution you're referring to
[11:37] <anorak> n00b: that is taken care of by ceph itself. Ceph has a nice utility to manipulate CRUSH maps which lets you make ceph "aware" of your physical setup .i.e. in which data center, which room or rack is your server located etc
[11:38] <anorak> n00b: ceph uses CRUSH to calculate the best optimal pg placement strategy
[11:38] <n00b> anorak: ok
[11:39] <n00b> 2 separate hard disk...one hard disk for the OS, one for the OSD
[11:39] <n00b> [05:28] *** yguang11 quit (Remote host closed the connection)
[11:40] <anorak> n00b: yes. if your server has the physical capacity to have 8 hard disks, then one for OS, the rest of OSDs (this will result in seven OSDs)
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[11:40] <anorak> the rest for* OSDs
[11:42] <n00b> so my basic setup to be safe should be: a minimum of 2 storage nodes cluster with replication factor of two, each node with 2 separate hard disks, one hard disk for the OS, one for the OSD, and 3 mons
[11:43] <n00b> ?
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[11:44] <anorak> anorak: yes
[11:44] <anorak> n00b: yes
[11:44] <n00b> anorak: thanks a million!
[11:45] <n00b> now I can start looking at HW and start plalying with it
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[11:45] <anorak> n00b: No problem and enjoy! :)
[11:45] * trociny (~mgolub@93.183.239.2) Quit (Quit: ??????????????)
[11:46] <n00b> anorak: one more thing please: do the nodes have to have identical hardware?
[11:47] <anorak> n00b: not necessarily. I am running different hardware and did not come across any issue.
[11:47] <n00b> anorak: thank you!
[11:47] <n00b> you made my day!
[11:47] <anorak> n00b: your welcome!
[11:47] <anorak> :)
[11:48] <anorak> n00b: one thing more...in case you are intending to use it as a block storage, you will need a ceph client node.
[11:49] <n00b> anorak: ok
[11:49] * trociny (~mgolub@93.183.239.2) has joined #ceph
[11:49] <n00b> i'll keep that in mind
[11:49] <anorak> n00b: great!
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[12:10] <Edrian> morning
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[12:15] <Edrian> I'm playing with Ceph lately in order to see if it could fit my needs to replace various production storages I have
[12:16] <Edrian> as far as I've checked it... that's awesome :-)
[12:17] <Edrian> but though I found a way to rollback snapshots for rbd (storing vm images)
[12:20] <Edrian> I haven't found an obvious way to rollback the rados snapshots I created in order to restore the buckets I destroyed playing
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[12:22] <Edrian> I read the rados manpage and it doesn't mention anymore the cppool command that I've seen used now and then on some blogs
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[12:46] <jcsp> Edrian: rados pool-wide snapshots are not widely used (and they may not peacefully coexist with other types of snapshot)
[12:47] <jcsp> the ability to roll back isn't written iirc
[12:48] <Edrian> jcsp: ok, then what could be the best way to make backups/snapshots of the buckets I use with the swift/s3 api?
[12:48] <Edrian> I thought about settings some mds nodes and use rsync to backup the data
[12:49] <Edrian> but I was looking for a faster solution, integrated into ceph...
[12:49] <jcsp> CephFS and RGW don't see each other's data, so that wouldn't make sense.
[12:49] <Edrian> arf
[12:50] <jcsp> with RGW, you can configure master-slave replication, to keep a copy of your data elsewhere. other than that I'm not sure what people are using;
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[12:55] <Edrian> ok, I read about that in the ceph doc... I guess that's what the region are for. I'll dig into that then. By syncing the region once a day, I could have something equivalent to a daily backup, maybe...
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[13:26] <smerz> hey guys quick question. we got a test cluster which has seen lots of changes recently (due to testing). but for some reason it doesn't recover to a clean health. 0.3% of objects remain degraded. and i'm not sure why. https://gist.github.com/genisd/264bca953b519b9d2749
[13:27] <smerz> that's the osd tree map (which is a mess). but that aside any idea why it doesn't recover the last 0.3% of objects?
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[13:33] <anorak> smerz: I might be wrong but you may have to take the "down" osds out of the crush map
[13:34] <smerz> thanks. we'll check it out :)
[13:34] <anorak> smerz: one thing i would do more is see that to which osds those "degraded" pgs belong. Perhaps taking that osd(s) out might improve the state of your cluster
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[14:09] <nils_> is there a practical limit for the amount of snapshots one can have?
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[16:19] <Vasily> Hi
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[16:20] <Vasily> i have one problem with Ceph, can somebody help me, please?
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[16:21] <nils_> Vasily: it helps to state your problem, nobody is going to volunteer to help if they don't know what they're getting into ;)
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[16:22] <Vasily> oh, ok )
[16:23] <Vasily> i have a rbd image mapped and continuosly write to it
[16:23] <Vasily> then i want to test Ceph fault tolerance
[16:23] <Vasily> and just hard kill OSD daemons on one node (killall -9 cephosd)
[16:23] <Vasily> i have 8 OSD cluster on 4 nodes
[16:24] <Vasily> write to rbd image hangs for about 20 seconds
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[16:24] <Vasily> is there any way to reduce this downtime?
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[16:25] <Vasily> actually i wrote an e-mail to ceph-users today regarding this problem
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[16:25] <nils_> http://ceph.com/docs/master/rados/configuration/mon-osd-interaction/
[16:25] <Vasily> i've read it many times
[16:25] <Vasily> and lowered some timeouts, well... wait a sec
[16:25] <nils_> osd heartbeat grace is default 20 which would match your experience
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[16:26] <Vasily> osd heartbeat interval = 3
[16:26] <Vasily> osd heartbeat grace = 5
[16:26] <Vasily> osd heartbeat interval = 3
[16:26] <Vasily> osd heartbeat grace = 5
[16:26] <Vasily> osd heartbeat grace = 5
[16:26] <Vasily> oops
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[16:26] <Vasily> sorry
[16:26] <Vasily> mon osd min down reports = 1
[16:26] <Vasily> mon osd adjust heartbeat grace = false
[16:27] <Vasily> heartbeat interval = 5
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[16:27] <Vasily> but all above mentioned makes no sense really
[16:27] <Vasily> still 20 seconds IO freeze
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[16:28] <Vasily> what else can i do?
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[16:34] <Vasily> well, thanks for the link at least )
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[16:37] <gford> what i realized alot is that tons of howtos, manuals and stuff seems to be outdated
[16:37] <Vasily> true
[16:37] <gford> i tryed to increase pg/pgp num with the stuff i found yesterday ... didnt had any luck, had to recreate the pool after i increased default pg/pgp num
[16:38] <nils_> yeah that has shown rather peculiar behavior for me as well, default pg/pgp num didn't work so I had to increase it manually after creating the pool
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[16:40] <Be-El_> Vasily: did you restart the mon or inject the new settings?
[16:41] <Vasily> i've just restarted everything
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[16:41] <nils_> can you do ceph-daemon osd.$num config show and see if it parsed to option?
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[16:43] <Vasily> yeah, i see my options
[16:43] <Vasily> just took random osd and checked
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[16:44] <Be-El_> Vasily: there are two different things to be considered: the heartbeat between osd and the connection between a osd and a mon
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[16:46] <Vasily> i've lowered the timeouts mentioned in http://ceph.com/docs/master/rados/configuration/mon-osd-interaction/
[16:47] <Vasily> but still the IO downtime is about 20-30 seconds
[16:47] <Be-El_> Vasily: did the mon recognized the osd as down, or was it marked as down by another osd?
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[16:47] <Vasily> how i gonna know this? From logs?
[16:48] <Be-El_> the mon log or the ceph -w output should contain messages why the osd is down
[16:48] <Vasily> cluster [INF] osd.6 10.10.119.93:6801/28634 failed (43 reports from 6 peers after 20.033058 >= grace 20.000000)
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[16:49] <Be-El_> ok, so the grace period is still 20 seconds
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[16:50] <Vasily> hm... thanks ) gonna check
[16:51] <Vasily> this is odd because monitors and osds got different values of osd heartbeat grace
[16:52] <Vasily> gonna copy this setting from [osd] to [global] section
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[16:55] <Vasily> well now grace period is really 5 secs
[16:55] <Vasily> but still IO downtime more than 20 secs
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[16:56] <Vasily> or not...
[16:56] <Vasily> wait a sec
[16:57] <Be-El_> Vasily: if you just want to change a single configuration value, you can use the inject command. you do not need to restart the daemons
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[16:58] <Vasily> what daemon should I inject args into?
[16:58] <Vasily> into monitor?
[16:59] <Vasily> does one monitor promote new setting to others?
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[17:00] <Vasily> this is not very clear from docs really )
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[17:02] <Be-El_> Vasily: you can either inject it into a single mon (e.g. mon.1) or into all mons (mon.*)
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[17:02] <Vasily> thanks Be-El_
[17:02] <Vasily> you really helped!
[17:03] <Be-El_> you're welcome
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[17:14] <ganders> hi all, I've a cluster with 3 mon servers and 4 osd servers, each osd server has 9 osd disks, journals are on ramdisk except on osd server #1, that has the journals on fusion-io card with bbw, the thing is that we noticed recently that osd server #4 is getting to much CPU usage, like 92%,.. not all the time, but several times a day, and sometimes the same with osd server #2, we are running ceph
[17:14] <ganders> v0.82
[17:15] <ganders> is there any log or anything that i can take a look to see if there's any bottleneck that's making the cpu to goes up and up?
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[17:18] <jeroenvh> what kind of cpu's and disks are you using?
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[17:31] <ganders> jeroenvh: We've 2x Intel Xeon E5-2609v2 @2.50Ghz with 8 cores and 64GB RAM
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[17:31] <jeroenvh> and the disks
[17:32] <jeroenvh> SSD or spinning?
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[17:32] <ganders> jeroenvh: and the osd disks are 3TB spinning
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[17:35] <jeroenvh> hmm
[17:36] <jeroenvh> but there is no ceph recovery / relocation going on when it happens
[17:36] <ganders> jeroenvh: also I've noticed the used space between the nodes, let me share you the pastebin of that output
[17:36] <jeroenvh> its not really a good idea to run journals on ramdisk btw
[17:37] <jeroenvh> if your power fails, you might loose data
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[17:39] <ganders> jeroenvh: we know that but, we can recover from osd server #1 that has a fusion-io card with bbw, it's painful but we can
[17:39] <ganders> jeroenvh: http://pastebin.com/raw.php?i=kVY8CGwy
[17:40] <ganders> jeroenvh: node cephosd01,02 and 03 had relative the same disk usage...but cephosd04 goes away with that
[17:40] <jeroenvh> is the weight the same between the osds?
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[17:41] <ganders> jeroenvh: http://pastebin.com/raw.php?i=SmMkrfx5
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[17:42] <jeroenvh> and the distribution stays that way?
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[17:42] <jeroenvh> or is that only when the CPU is high?
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[17:42] <ganders> jeroenvh: always
[17:43] <ganders> jeroenvh: also i've only 33% allocated and really used just 12% of the total size of the cluster
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[17:44] <jeroenvh> strange
[17:44] <jeroenvh> it should always rebalance the data
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[17:45] <ganders> yeah it's really strange and we dont know what to look in this case
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[17:48] <jeroenvh> I dont have a clue right now
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[17:57] <smerz> anorak, you were right. i had to take them out of the crush map && remove them alltogether from the crush map
[17:58] <smerz> just fyi ;-)
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[18:04] <anorak> smerz: glad to hear it solved your problem! :)
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[18:17] <Hydrar> On the manual deployment page, it says I should add the OSD key with permission mon 'allow profile osd', and on the add or remove osd page, it tells me to use mon 'allow rwx', is there any difference or is the first a alias for the second?
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[18:47] <m0zes> so, I've have a crash with my cephfs kernel client. http://i.imgur.com/LtlsJFC.png All of a sudden memory usage spiked from 12GB to 128GB (all kernel space, as swap was never touched)
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[18:48] <m0zes> 3.19.5 client kernel, 0.94.1 centos 7.1 server-side.
[18:49] <m0zes> http://i.imgur.com/yRCvhPj.png <-- memory usage graph
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[19:30] <cholcombe> ceph: does the python rados client require the admin key to connect or can i create another key for it?
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[19:57] <jcsp> m0zes: can you open a ticket with that backtrace at http://tracker.ceph.com/projects/ceph-kclient/issues?
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[20:36] <m0zes> jcsp: done http://tracker.ceph.com/issues/11615
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[20:43] <dmick> cholcombe: the rados client uses client.admin as its default name, but you can change that in the Rados() constructor with either rados_id or name arguments
[20:43] <dmick> it's the client name that selects the key
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[21:02] <cholcombe> dmick: ok thanks :)
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[21:03] <fxmulder_> so I have cephfs setup across 4 osds, one of which is down but ceph status still shows health ok
[21:04] <fxmulder_> hmm, the weight on the down osd is 0
[21:04] <fxmulder_> is that done automatically?
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[21:17] <mtanski> fxmulder_: ceph OSD subsystem automatically migrates the data (objects) without any interactions from higher level users (cephfs). And provided that it still matches your replication requirements (say 3x rep). It will show HEALTH_OK
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[21:23] <fxmulder_> I would figure it would at least be a health warn
[21:23] <mtanski> Do you have a lot of objects?
[21:24] <mtanski> If you have little data, and it took like seconds to move it over then you prob woldn???t even notice
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[21:27] <fxmulder_> I'm just thinking, 1 osd down isn't really an OK state
[21:27] <fxmulder_> even if things are still working as expected
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[21:31] <mtanski> well in a large cluster I imagine you???ll always have something going on
[21:31] <mtanski> bad drive, bad machine
[21:31] <mtanski> so bad drive if you have 100s or 1000s is not a uncommon case
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[21:33] <m0zes> if you cut off a finger, you can still be healthy ;)
[21:33] <m0zes> so long as you have enough fingers left to do your job.
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[21:54] <stupidnic> Can somebody provide me with a consistent way of performing write performance benchmarks? I am using rados bench but my results seem to differ everytime I run it
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[22:00] <fxmulder_> m0zes: if I cut off a finger I would definitely be in a health warn state
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[22:00] <m0zes> fxmulder_: and it was, until it healed over the wound
[22:01] <fxmulder_> my osd hasn't healed yet
[22:01] <m0zes> no, but the cluster has healed around it.
[22:02] <fxmulder_> I guess we have different ideas of being in an ok state
[22:02] <fxmulder_> but I can see the point about a large cluster
[22:02] <m0zes> from the software's point of view, there is no increased chance of losing data at the moment, and nothing is slow enough to be outside the default warning levels.
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[22:03] <m0zes> to be fair, I do have these: https://github.com/valerytschopp/ceph-nagios-plugins
[22:04] <m0zes> I check osd status on a per host basis, on top of the ceph health
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[22:10] <fxmulder_> true, I don't have this on nagios as it is just a test cluster, the ok status when an osd was down just seemed strange
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[22:13] <m0zes> well, this is both good and bad. I triggered 4 kernel panics in a row with cephfs on a client system this morning. now I'm setup to capture the backtraces and I can't trigger it using the same methods.
[22:14] <cmdrk> stupidnic: do you have a writeback cache or something in play? maybe just try running the benchmarks for a longer time.. 1hr+ ?
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[23:50] * dgurtner (~dgurtner@217-162-119-191.dynamic.hispeed.ch) Quit (Ping timeout: 480 seconds)
[23:55] * daniel2_ (~dshafer@0001b605.user.oftc.net) Quit (Remote host closed the connection)

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