#ceph IRC Log

Index

IRC Log for 2015-08-19

Timestamps are in GMT/BST.

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[0:30] <dgbaley27> Hey, I converted a system with OSDs from Ubuntu to CentOS7. Looks like this involved a downgrade of leveldb from 1.15 to 1.12. I cannot start my OSDs now because leveldb is complaining of missing files. I noticed in /var/lib/ceph/osd/*/current/omap that there are .ldb files but no .sst files. Anyone knwo what to do?
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[0:40] <zaitcev> dgbaley27: I would try and pick the 1.15 SRPM from SLES and try and graft it onto CentOS 1.12 spec. But I have an experience building custom RPMs. Not sure it's something you want to attempt.
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[0:44] <dgbaley27> zaitcev: I have no problem doing that, hardest part is located the right srpm.
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[0:49] <zaitcev> dgbaley27: yeah... I would simply try to drop the 1.15 or 1.17 tarball into existing Fedora SRPM and hope for the best.
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[0:51] <zaitcev> (as opposed to trying to find OpenSuSE stuffs)
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[0:52] <dgbaley27> Yup, that's what I'm doing, I've started with the EPEL source.
[0:52] <dgbaley27> Luckily the versions seem to be binary compatible, otherwise I'd probably give up
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[4:15] <evilrob00> so I've got ceph up and running backending my openstack cluster. ceph-deploy makes it easy to create a rgw instance, but how do I use multiple rgw instances? Through a load balancer? Is there a built in mechanism I'm not seeing in the docs?
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[4:26] <evilrob00> https://ceph.com/category/radosgw/ basically suggests frontending multiple rgw instances with tengine (nginx fork) configured a a load balancer.
[4:29] <evilrob00> anyone here used tengine to do that?
[4:32] <m0zes> you can do any passive loadbalancing you want. you could even do rrdns if you want.
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[4:38] <snakamoto> I did rrdns at my last job, after the networking guys realized I was going to kill their load balancer
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[4:43] <m0zes> I bet you could put it behind one of the various ipvs modes
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[7:46] <serg> hello everyone, remind me plz a ceph command... its similar to rados ls df or some like that... three words... which show some statistics. latest version
[7:49] <m0zes_> ceph osd pool stats ?
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[7:50] <serg> no...i had before not latest version of ceph(firefly) and that command doesn't work. now it should work,but i dont remember it...))
[7:55] <zaitcev> That's too vague. Could be anything, like ceph osd perf, ceph osd stat, or even ceph pg stat. Read the whole output of ceph osd --help and ceph pg --help. If it even exists, it will be there.
[8:00] <serg> thx
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[8:25] <travmi> Can someone point me in the direction of where to find documentation in the event all monitor nodes go down
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[8:43] <serg> they placed on different servers?
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[10:54] <serg> how can i check that mds is assigned to my pools?
[10:54] <serg> ceph mds dump as i understand - what should be there?
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[11:21] <sk4nz> Hello, when I create a OSD with ceph-deploy, I got an error about my new fsid ( eg 000000000000...) that didn't match my original fsid. Full commands/output here : http://pastie.org/private/s8ppqeymr1cui4p2nzmsq Any ideas ? Is that the --overwrite-conf switch ?
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[11:31] <serg> sk4nz, follow the http://ru.5.ispdoc.com/index.php/%D0%A1%D0%BE%D0%B7%D0%B4%D0%B0%D0%BD%D0%B8%D0%B5_Ceph_%D0%BA%D0%BB%D0%B0%D1%81%D1%82%D0%B5%D1%80%D0%B0
[11:31] <serg> my cluster works fine, created my that man
[11:32] <sk4nz> serg: will check, ty
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[11:34] <serg> just install fresh ceph,not a cuttlefish)
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[12:16] <Gugge-47527> sk4nz why are you preparing sdb and activating /dev/sdb1 ?
[12:16] <sk4nz> Gugge-47527: because prepare needs a disk and activate a partition ?
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[12:19] <Gugge-47527> fair enough, im just used to running them against the same mountpoint
[12:20] <Gugge-47527> (i dont use any of the automount magic)
[12:22] <Gugge-47527> does the jounrnal device exist ? (/dev/disk/by-partuuid/54697c30-a82f-4be0-9378-b2d49f56ecb0)
[12:23] <sk4nz> Nope... I fear my weird setup is the main reason : the actual /dev/sdb disk is a *real* hard drive mounted on a KVM guest (cosd1)
[12:24] <Gugge-47527> if that doesnt exist, i know why it cant run the mkjournal stuff :)
[12:25] <Gugge-47527> does /dev/sdb1 and /dev/sdb2 exist?
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[12:26] <Gugge-47527> if they do, you could mount sdb1, and change the journal symlink to /dev/sdb2, but if you ever change something that makes sdb change name, the osd wont work :)
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[12:27] <sk4nz> Only /dev/sdb1 is created, but yheah I see you, all about the journal partition. I might create a new partition on my KVM guest disk /dev/sda and mount the journal inside
[12:28] <Gugge-47527> you could just remove the symlink, and let it use a file on /dev/sdb1 as journal :P
[12:28] <Gugge-47527> it doenst sound like you are going for performance anyway with your setup :)
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[12:29] <sk4nz> Yheah its for some testing :p, I will try this asap
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[12:37] <peem> sk4nz: not sure about that, but is it because you using "ceph-deploy disk prepare/activate" ? I usually use "disk zap", then "osd prepare/activate". Not sure if "osd prepare" differs from "disk prepare" though.
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[15:33] <YmrDtnJu> hi. when i upgrade from 0.87 to 0.94 i get the following error message "filestore DOBjbectMap requires an upgrade, set filestore_update_to". why and what do i have to do?
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[15:51] <poseidon1157> Hi all
[15:51] <kefu> YmrDtnJu, you will find some other error message reads "FileStore::mount : stale version stamp" blah
[15:51] <poseidon1157> Can anyone link me to the hashing algorithm used by Ceph?
[15:52] * lucas (~Thunderbi@218.76.52.64) Quit ()
[15:52] <poseidon1157> I can't find documentation aside from the CRUSH whitepaper
[15:52] <kefu> and that will show you the version #, to which you will need to change "filestore_update_to"
[15:53] <YmrDtnJu> kefu: sorry. i don't have that version.
[15:53] <YmrDtnJu> sorry. that error message.
[15:54] <YmrDtnJu> kefu: i have that error message. just found it.
[15:54] <kefu> cool
[15:54] <YmrDtnJu> why do i have to do that? i don't understand.
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[15:54] <YmrDtnJu> the release notes do not tell me to set anything...
[15:55] <YmrDtnJu> "stale version stamp detected: 3. Proceeding, do_update is set, performing disk format upgrade."
[15:55] <YmrDtnJu> that message seems to me, that ceph-osd is already trying to upgrade the store.
[15:55] <kefu> yeah.
[15:56] <kefu> but it turns out it didn't... weird.
[15:56] <YmrDtnJu> "filestore upgrade_to_v2 start"
[15:56] <YmrDtnJu> then
[15:56] <YmrDtnJu> "filestore upgrade_to_v2 done"
[15:56] <poseidon1157> Does anyone know where to find documentation on the hashing algorithm used by Ceph?
[15:57] <kefu> so the osd is good now?
[15:57] <YmrDtnJu> kefu: no. i does not start.
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[15:58] <YmrDtnJu> kefu: http://pastebin.com/mTKJEdX4
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[15:59] * kefu reading
[15:59] <YmrDtnJu> the docs say, that filestore_update_to is 1000 be default.
[16:00] <poseidon1157> Nevermind. Found crush_hash32_rjenkins1_2 in the linux kernel source
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[16:01] <kefu> YmrDtnJu, could you paste log somewhere?
[16:02] <YmrDtnJu> osd log? ok. but there is hardly more. :-) a second please.
[16:02] <kefu> i mean the full log, not just the error message.
[16:02] <kefu> thanks.
[16:03] <YmrDtnJu> kefu: http://pastebin.com/eJTnG3x7
[16:04] <YmrDtnJu> there is actually not more. i always get those lines.
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[16:06] <YmrDtnJu> kefu: i paste another set of lines. those line i already pasted are from starts of the osd after the first time. another second please.
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[16:06] <kefu> ok
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[16:08] <YmrDtnJu> kefu: http://pastebin.com/6rigBE9d this is the log of the first start of the osd of ceph version 0.94.2.
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[16:09] <kefu> YmrDtnJu, but i failed find the line of "FileStore::mount : stale version stamp"
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[16:09] <YmrDtnJu> that line is only in the log of the first start.
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[16:09] * kefu reading
[16:10] <YmrDtnJu> kefu: i have to say, that my init script of an osd always flushes the journal after stopping and create a new journal before starting. so maybe this is the problem.
[16:10] <TheSov2> are the ceph devs looking at the osd cache maps consumption issue?
[16:10] <YmrDtnJu> you cannot create a new journal with old data?
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[16:14] <kefu> YmrDtnJu, i think that is exactly what the ceph-osd was doing between upgrade_to_v2 {start,done}
[16:15] <YmrDtnJu> kefu: so. i am not allowed to flush the journal an create a new one while upgrading?
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[16:16] <kefu> one way to workaround it is to flush before upgrade.
[16:16] <YmrDtnJu> ok
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[16:17] <kefu> but the osd is designed to make it easier, it translates the omap to the new format.
[16:17] <YmrDtnJu> that will be _very_ complicated. it is easier to not flush it at all. just restart.
[16:17] <poseidon1157> Does anyone know where I can find out more about rjenkins?
[16:18] <YmrDtnJu> can i fix the current problem?
[16:18] <YmrDtnJu> or do i have to recreate the osd?
[16:18] <serg> why scrub starts? its just diagonostical?
[16:18] <kefu> YmrDtnJu, could you find the store_version file in your data directory?
[16:18] <YmrDtnJu> ok
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[16:19] <YmrDtnJu> kefu: found it. :-) that was easy. *g+
[16:19] <kefu> so you figured it out? haha.
[16:20] <YmrDtnJu> should i replace the 4 with a 3 and try again?
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[16:20] <kefu> i was meant to suggest to change it back to the stale version stamp.
[16:20] <kefu> right.
[16:20] <YmrDtnJu> ok
[16:20] <YmrDtnJu> i will rewrite my init script, so that a restart operation does not touch the journal.
[16:21] <kefu> okay. but i'd expect that you don't need to restart the osd that often =)
[16:22] <YmrDtnJu> kefu: only for updates. :-)
[16:24] <serg> ID WEIGHT TYPE NAME UP/DOWN REWEIGHT PRIMARY-AFFINITY
[16:24] <serg> -1 10.19989 root default
[16:24] <serg> -2 1.69998 host osd00
[16:24] <serg> 0 0.84999 osd.0 up 1.00000 1.00000
[16:24] <serg> 1 0.84999 osd.1 up 1.00000 1.00000
[16:24] <serg> -3 1.69998 host osd01
[16:24] <kefu> YmrDtnJu, good luck. but force upgrade might fail again. i have not idea why the upgrade failed to work for you atm...
[16:24] <serg> 2 0.84999 osd.2 up 1.00000 1.00000
[16:24] <serg> 3 0.84999 osd.3 up 1.00000 1.00000
[16:24] * kefu brb.
[16:24] <serg> -4 1.69998 host osd02
[16:24] * kefu is now known as kefu|afk
[16:24] <serg> 4 0.84999 osd.4 up 1.00000 1.00000
[16:24] <serg> 5 0.84999 osd.5 up 1.00000 1.00000
[16:24] <serg> -5 1.69998 host osd03
[16:24] <serg> 6 0.84999 osd.6 up 1.00000 1.00000
[16:24] <serg> 7 0.84999 osd.7 up 1.00000 1.00000
[16:24] <serg> -6 1.69998 host osd04
[16:24] <YmrDtnJu> kefu|afk: i will see.
[16:24] <serg> 8 0.84999 osd.8 up 1.00000 1.00000
[16:24] <TheSov2> serg you are gettind dangerously close
[16:24] <serg> 9 0.84999 osd.9 up 1.00000 1.00000
[16:24] <serg> -7 1.69998 host osd05
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[16:24] <serg> 10 0.84999 osd.10 up 1.00000 1.00000
[16:24] <serg> 11 0.84999 osd.11 up 1.00000 1.00000
[16:24] <serg> cannot understand what means 1.00000 in the right??
[16:24] <serg> i have weight 0.85 with osd
[16:24] <TheSov2> thats its weight
[16:25] <serg> it is weight required or what
[16:26] <TheSov2> yes
[16:26] <TheSov2> all disks should have a weight
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[16:26] <TheSov2> typically, you weight them in terabytes so you can accurately store data on the disk
[16:26] <TheSov2> for 1tb osd's i weight them at 1
[16:27] <TheSov2> 2tb osd gets a weight of 2
[16:27] <serg> thx
[16:27] <TheSov2> because the 2 tb has double the space of 1tb
[16:27] <TheSov2> just fyi that is very serious here. if you do this wrong you will fuck shit up
[16:27] <TheSov2> so its best to weight them all at one and use the same size disk across the board
[16:28] <serg> i have 940gb on eact, so i cannot set to 1,right?
[16:28] <serg> on each*
[16:28] <TheSov2> it can be one
[16:29] <TheSov2> the weight can be any number
[16:29] <TheSov2> but*
[16:29] <TheSov2> that number determines what ratio of data that osd will get
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[16:29] <TheSov2> so 1 everywhere will mean data is evenly distributed accross all osd
[16:30] <TheSov2> the same would happen if you had 2 or 3 or 4 everywhere
[16:30] <TheSov2> the point of a weight is to determine the ratio of data an osd will have
[16:30] <TheSov2> if you have a failing osd, and you want to replace it. you can reweight it to 0, and ceph will evacuate all the data
[16:30] <TheSov2> then you can delete it
[16:31] <TheSov2> you only want to mess with wieghts if you are using unlike disks
[16:31] <TheSov2> or tiered storage
[16:31] <TheSov2> otherwise use the same size and type of disk across the board
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[16:32] <TheSov2> serg, when i said dangerously close i mean to getting kicked for spam
[16:32] <TheSov2> usually you are supposed to pastebin that stuff
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[16:53] <YmrDtnJu> kefu: it did work. :-)
[16:53] <YmrDtnJu> thank you.
[16:53] <kefu> aha =D
[16:53] <kefu> yw.
[16:54] <YmrDtnJu> maybe i would be an idea to somehow prevent people from flushing the journal with the wrong version of an osd.
[16:55] <kefu> yeah, that could be the root cause, but i have not sort out exactly why...
[16:56] <kefu> probably, should not flush using the old journal using the new ceph-osd.
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[18:21] <c4tech> We currently have a SSD write-back cache tier that will scale with our cluster. I've noticed that there is almost no impact to performance with our cluster when having journals contained on the SAS drives that the write-back cache tier is caching. I feel like recommending to customers on using a heavy write-back cache tier instead of putting journals on SSD. Is there anyone that would disagree
[18:21] <c4tech> with me?
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[18:25] <TheSov2> c4tech, theres a logistical problem in that the journal and data are both being written to the same disk
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[18:26] <TheSov2> the idea is to make writing linear, when you do that is random IO
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[18:26] <TheSov2> if you are using SSD its almost moot but im left wondering how long your cache tier would last
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[18:32] <c4tech> TheSov2 My experiences are that it's far better using the ssd's for the writeback cache tier instead of journaling.
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[18:33] <c4tech> As long as you grow the writeback cache tier with your cluster
[18:33] <TheSov2> WB caching is only supported in RBD's correct?
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[18:35] <c4tech> We're using it for RGW pools, KRBD, and Openstack RBD. Everything running needs to be RAW for openstack however.
[18:36] <c4tech> For instance you can upload a qcow2 image, when you try to run it, it get's converted to RAW
[18:36] <TheSov2> nice
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[19:34] <snakamoto1> I hope SourceForge releases their RCA soon
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[19:39] <burley> snakamoto1: While I expect we'll publicly release more details after all the internal work is done, the root cause is already public: http://tracker.ceph.com/issues/11586
[19:41] <snakamoto1> burley: Thank you so much!
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[19:56] <travmi> Is there documentation on brinigng a cluster back when all monitor nodes get shutdown? I made a mistake when adding more and now there is no quorum.
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[19:57] <olid1984> without quorum nothing will move, you will have to get some monitor's on
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[19:57] <doppelgrau> travmi: would take a look on the ???remove from dead cluster??? part of the monitor management page
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[20:00] <snakamoto1> burley: reading through bug tracker and the related git commit, it sounds like this affects any object, no just RBDs. Do you know if that's so?
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[20:04] <burley> That's my understanding as well
[20:05] <rkeene> Any object the OSD would open at random intervals
[20:05] <Aeso> When working through the Quick Start guide, I ran into a problem where the 'ceph-deploy mon create-initial' step fails, saying it can't find the mds keyring. It finds the osd and mon keyrings fine. Any ideas?
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[20:12] <zaitcev> Ugh, I had that problem in Firefly. Moved rings around randomly until it worked and can't remember now what I did...
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[20:50] <tenshi> Hi everyone
[20:50] <olid1984> hi
[20:50] <tenshi> I m back agian with some stupid questions
[20:50] <tenshi> ;)
[20:51] <tenshi> we are in a setup with 5 OSDnodes 3 Monitors. All OSDnodes are having 12 SSD for OSDs and 4 Journal SSDs too. (each OSDnode)
[20:51] <tenshi> we are having some terrible performance
[20:51] <tenshi> when recovering one OSDnode for example.
[20:52] <tenshi> precisely at the end of the recover, if we have for example like 7 PGs to recover at the end
[20:52] <olid1984> what means terrible ? in general with ceph -w you can monitor whats going on
[20:52] <tenshi> performance on the cluster are extremly slow.
[20:52] <tenshi> its recovering the last 7 pgs
[20:53] <tenshi> that needs to
[20:53] <tenshi> but this since 3 hours now..
[20:53] <tenshi> (by performance I mean, that cluster cannot give more I/O ; all the VMs that reside on that cluster are stucked)
[20:53] <olid1984> well ceph -w will tell you what he does, and based on that information you can proceed
[20:54] <tenshi> 2015-08-19 14:54:03.560022 mon.0 [INF] pgmap v3737437: 6400 pgs: 6398 active+clean, 2 active+recovering+degraded; 752 GB data, 2157 GB used, 53706 GB / 55863 GB avail; 0 B/s rd, 48155 B/s wr, 10 op/s; 519/277487 objects degraded (0.187%)
[20:54] <tenshi> here you go
[20:54] <tenshi> as said
[20:54] <tenshi> its been finished the last 7 objects
[20:54] <tenshi> since 3 hours
[20:55] <olid1984> the next step would be to check the osd logs on each of your nodes
[20:55] <olid1984> whats going on there
[20:55] <olid1984> there must be something somewhere a loop/problem
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[20:57] <tenshi> looking at this, you got a point there ;)
[20:57] <tenshi> thank you for the advice
[20:57] <olid1984> welcome :)
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[21:03] <tenshi> hey olid1984 on our side we checked
[21:03] <tenshi> 6 osd were implied by this we checked the logs for them
[21:03] <tenshi> nothin unusual, just some scrubs running while the recovery
[21:03] <tenshi> was processed
[21:04] <tenshi> but that it, even no errors in the logs, and some WARNs about slow requests
[21:06] <olid1984> the next step would be to check the drives, maybe you have somewhere a malfuncture, checking smart, checking hdd/kernel related logs
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[21:06] <tenshi> Ok i have a nagios check on 60 SSDs drives
[21:06] <olid1984> i think there is also a possibility with osd disk to check the actual status whats going on
[21:06] <tenshi> noones is failling
[21:07] <tenshi> we had some bad ssds we changed them
[21:07] <tenshi> before doing that setup
[21:07] <tenshi> we are pretty sure all drives are good.
[21:07] <tenshi> there is something we are not doing correctly for sure
[21:07] <tenshi> as its a ceph all SSDs setup
[21:07] <tenshi> it should be fast first but also really fast to recover even with backfills =1 and recovery max =1
[21:08] <tenshi> right now the cluster ended recovery
[21:08] <tenshi> after 3hours
[21:08] <tenshi> but still having:
[21:08] <tenshi> health HEALTH_WARN
[21:08] <tenshi> 6 requests are blocked > 32 sec
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[21:14] <olid1984> in general you should check
[21:14] <olid1984> http://ceph.com/docs/master/rados/operations/monitoring/
[21:14] <olid1984> and
[21:14] <olid1984> http://ceph.com/docs/master/rados/operations/monitoring-osd-pg/
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[21:15] <olid1984> http://ceph.com/docs/master/rados/troubleshooting/troubleshooting-osd/
[21:15] <olid1984> and so on
[21:15] <olid1984> there are some tools to check what a specific osd is doing
[21:15] <olid1984> and thats what you have to do in such a situation
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[21:26] <tenshi> on your side
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[21:26] <tenshi> what would you do
[21:26] <tenshi> i m running out of ideas
[21:27] <tenshi> and thats why we came here, we ve done most of the work you are talking about
[21:27] <olid1984> you really have to check the exact status of every osd what this osd is doing at this specific time point
[21:27] <olid1984> well i am sorry, that i can not tell you more, unfortunatelly i am also more or less very new to ceph, i just joined here 2 days ago, so i am very very far away from being a pro
[21:29] <tenshi> thank you for your help btw ;)
[21:29] <tenshi> much appreciated
[21:29] <olid1984> i am sorry, that i dont have the perfect tip for you what to do ^^'
[21:30] <tenshi> hehe not your fault ;)
[21:30] <tenshi> I m just a bit surprised that we a cluster of this size , full 10 Gb redundant switches, 60 OSDs in SSDs and 20 journal SSDs; I can?? t believe
[21:31] <tenshi> that we are doing so shitty performance, there is something that we are doing bad for sure.
[21:31] <olid1984> well something general about ssd:
[21:31] <olid1984> ssd loose a lot of their performance, if you have continouse IO
[21:31] <olid1984> ssd can handle peaks very well
[21:32] <olid1984> but if an ssd has to deliver nonstop IO, it has a great break down
[21:32] <olid1984> that goes especially for the ssd with MLC chip
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[21:33] <olid1984> i was reading that already two times in magazines, that the IOPS are getting really fucked up on long duration IO szenarios
[21:33] <olid1984> even below normal sata in worst case
[21:33] <olid1984> in general: check your system
[21:33] <olid1984> do you have high %WA ?
[21:33] <tenshi> thank for this feedback.
[21:33] <tenshi> nop
[21:33] <tenshi> iostat looks pretty good
[21:34] <tenshi> servers are not doing a lot of thing also our VM solution is in test right now
[21:34] <tenshi> so no real access only devs and team.
[21:34] <tenshi> iostat and OSDnodes looks pretty good
[21:34] <olid1984> well so you really have to investigate every osd what it is doing
[21:34] <tenshi> even while in recovery
[21:34] <tenshi> one thing that I noted
[21:34] <tenshi> when recovery we have some scrubs
[21:34] <tenshi> that are done in the same time, that could litterally kill the performance
[21:35] <tenshi> but it may be a normal behavior
[21:35] <tenshi> i m asking myself
[21:35] <olid1984> i mean logically, it can not be, that you have no %WA and low cpu utilization and at the same time the cluster is working slowly
[21:36] <olid1984> it must be an intresting config mistake, if your cluster can manage to be slow while CPU/IO stats are low
[21:36] <olid1984> eighter its fast, because you have reserves @ IO/CPU
[21:36] <olid1984> or its slow, because your IO/CPU is overloaded
[21:36] <olid1984> but slow and low cpu/io usage, thats very strange
[21:36] <tenshi> true
[21:37] <tenshi> when recovering we have a bit of load
[21:37] <olid1984> but thats all just general bla bla, you will really have to check what every hdd/osd is doing
[21:37] <tenshi> but iostat shows no problem.
[21:37] <olid1984> maybe some hdd is, for some reason, slow
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[21:39] <tenshi> how may I find which
[21:39] <tenshi> one
[21:39] <tenshi> is defect as we have monitoring on each ones (for SMART for example) and everything is fine
[21:40] <tenshi> do you have any quick method that could allow me finding
[21:40] <tenshi> which osd is slower than the others ?
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[21:40] <tenshi> as for example I have some blocked requests, I want to find where they are blocked
[21:42] <tenshi> ?
[21:42] <olid1984> let me check google ^^;
[21:44] <olid1984> http://ceph.com/docs/master/rados/troubleshooting/troubleshooting-osd/
[21:44] <olid1984> that should help you
[21:46] <tenshi> i was already on that ;)
[21:46] <tenshi> but thanks again
[21:46] <olid1984> ^^; sry
[21:47] <ayang> does ceph (hammer) support interaction via Amazon AWS SDK for Java? AWS Signature Version 4 (AWSS3V4SignerType)?
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[21:58] <tenshi> OK so I went deeper in our investigation
[21:59] <tenshi> all drives , journal and OSDs are having like 0% use reported by
[21:59] <tenshi> rados bench
[21:59] <tenshi> by iostat sorry.
[22:00] <tenshi> Even when I m trying to benchmark the volume, I have horrible performance and all drives on iostat seems to be acting well (less than 2% use)
[22:00] <tenshi> and not so much iowait
[22:00] <tenshi> but the benchmark results are horrible :
[22:00] <tenshi> [root@cephmon1 ~]# rados -p vms bench -b 512 100 write
[22:00] <tenshi> Maintaining 16 concurrent writes of 512 bytes for up to 100 seconds or 0 objects
[22:00] <tenshi> Object prefix: benchmark_data_cephmon1_11526
[22:00] <tenshi> sec Cur ops started finished avg MB/s cur MB/s last lat avg lat
[22:00] <tenshi> 0 0 0 0 0 0 - 0
[22:00] <tenshi> 1 16 762 746 0.364211 0.3642580.00657068 0.0170462
[22:00] <tenshi> 2 16 1399 1383 0.33761 0.3110350.00569944 0.016441
[22:00] <tenshi> 3 16 1589 1573 0.255994 0.0927734 0.0086885 0.0225098
[22:00] <tenshi> 4 16 1772 1756 0.214333 0.08935550.00660169 0.0259873
[22:00] <tenshi> 5 16 2125 2109 0.205934 0.1723630.00493001 0.0342444
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[22:00] <tenshi> I feel like its a configuration problem
[22:01] <olid1984> how does your ceph.conf look like ?
[22:01] <tenshi> sending you
[22:03] <tenshi> http://pastebin.com/S0vECiBC
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[23:09] <mfa298> tenshi: reading scrollback - and I'm also a relative new comer to ceph, I think you're saying it's all SSDs and you have journals on seperate SSDs to the data storage.
[23:09] <mfa298> did you have a reason for that?
[23:10] <mfa298> my understanding was if you had SSDs for everything it made more sense to have the journal on the same device as the storage
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