#ceph IRC Log

Index

IRC Log for 2015-07-06

Timestamps are in GMT/BST.

[0:02] * linjan (~linjan@80.179.241.26) Quit (Ping timeout: 480 seconds)
[0:16] * EdGruberman (~x303@5NZAAEQG8.tor-irc.dnsbl.oftc.net) Quit ()
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[0:55] * danieagle (~Daniel@177.68.230.49) Quit (Quit: Obrigado por Tudo! :-) inte+ :-))
[0:55] <scott_> Can anyone recommend the best SSD for journel, and IOPS?
[0:57] <Nats_> intel dc s3700 is the usual recommendation
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[1:09] <scott_> Thanks
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[4:49] * tsugano (~tsugano@nat-pool-nrt-t1.redhat.com) Quit (Remote host closed the connection)
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[9:12] * Be-El (~quassel@fb08-bcf-pc01.computational.bio.uni-giessen.de) has joined #ceph
[9:12] <Be-El> hi
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[12:55] <zidz> Hi there!
[12:55] <zidz> I have a ceph noob problem with ceph-deploy...
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[12:55] <zidz> Anyone that has time for my stupid questions?
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[12:57] <zidz> I get error message "[ceph_deploy.mon][ERROR ] Failed to execute command: initctl emit ceph-mon cluster=ceph id=lxc-ceph-node1" with running command "ceph-deploy mon create-initial"
[12:58] <zidz> Google can't find anyone that had this particular problem
[12:59] <zidz> I can run "sudo ceph-mon --cluster ceph --id lxc-ceph-node1" with out any error message on the mon node.
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[13:01] <Be-El> that's not the command ceph-deploy is trying to start
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[13:36] <theanalyst> what happens when different ceph monitors run with different values of ceph config?
[13:37] <theanalyst> I've a situation where the first monitor to bootstrap the cluster has a few different options compared to other ceph monitors
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[14:10] <alfredodeza> zidz: with ceph-deploy it is always useful to get the full paste in some paste site to share, it is usually something else that happened before that is the cause
[14:10] <alfredodeza> if you can share that I can take alook
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[14:38] <zidz> alfredodeza: I'll send a pastebin link in a moment :-) tnx
[14:40] <zidz> alfredodeza: http://pastebin.com/8PvQsWMF
[14:42] <zidz> Be-El: So, what is it trying to start?
[14:42] <Be-El> zidz: what the output actually states: initctl emit ceph-mon cluster=ceph id=lxc-ceph-node1
[14:44] <zidz> Yes, but 'initctl emit ceph-mon cluster=ceph id=lxc-ceph-node1' failes when run by ceph-deploy and when run manually. So I tried to run 'ceph-mon --cluster ceph --id lxc-ceph-node1' thats should be the result of the 'initctl emit ceph-mon cluster=ceph id=lxc-ceph-node1' line.
[14:45] <Be-El> zidz: it doesn't matter whether it works for you on the command line. ceph-deploy uses initctl and insists on using it
[14:46] <Be-El> zidz: if something with our initsystem is not setup correctly, other services will also fail
[14:46] <Be-El> eh..is wrong with....too hot for typing...
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[14:47] <zidz> I wanted to state that the initctl doesn't seem to do it correct, so you understand correct.
[14:48] <zidz> Now to the 2'000 dollar question. How may we solve this issue?
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[14:51] <alfredodeza> zidz: not sure what the problem is here, you say initctl is the wrong command?
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[14:52] <Be-El> zidz: initctl may log to the system log files, so I would start having a closer look at them
[14:52] <zidz> I say that ceph-deploy gets exit 1 when 'sudo initctl emit ceph-mon cluster=ceph id=lxc-ceph-node1' is run.
[14:52] <zidz> [ERROR ] RuntimeError: command returned non-zero exit status: 1
[14:52] <alfredodeza> right, but that doesn't sound like a ceph-deploy issue
[14:52] <zidz> Be-El: I'l take a look
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[14:57] <zidz> alfredodeza: That's correct, it isn't the ceph-deploy process that generate errors. But it executes code on another node that fails and that's why I'm here.
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[14:58] <zidz> Be-El: Couldn't find any log entrys besides from auth.log (due to the execution with sudo)
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[15:00] <Be-El> zidz: upstart jobs usually put log files into /var/log/upstart
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[15:04] <zidz> Be-El: yes I know
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[15:21] <zidz> So I guess
[15:21] <zidz> that no one has seen this problem before..
[15:22] <zidz> (http://pastebin.com/8PvQsWMF)
[15:23] <rlrevell> not specifically but i have seen 1000s of other upstart bugs
[15:23] <rlrevell> yay ubuntu, best idea ever
[15:23] <zidz> :-)
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[15:26] <lathiat_> zidz: checked syslog?
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[15:27] <lathiat_> also try run it manually
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[15:29] <ska> Which Ceph components allow distribution? Which components don't?
[15:29] <ska> I thought you could only have one MDS per cluster?
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[15:32] <ska> I guess the notes in docs indicate that Only one MDS server is supported in production.
[15:32] <m0zes> ska: you can have multiple. current best practices have active/standby mds servers,
[15:32] <m0zes> 1 active, n standbyt.
[15:32] <lathiat_> http://ceph.com/docs/master/man/8/ceph-mds/ would suggest ceph-mds is active/standby
[15:32] <lathiat_> afaik mon and osd roles are basically scalable to whatever
[15:33] <lathiat_> ding to m0zes
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[15:44] <ska> Does anyone have a curl or other example of a Calamari query that hits the CLI url?
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[15:44] <MaZ-> hmm.. so when i do a bucket list an add up size_kb, I get ~7.7Tb of data - pool has size=2, so i'd expect ~15.4Tb raw used - but I currently see.... Raw Used 38460G - which is... significantly, more than i'd expect ;O - theres nothing in gc list either
[15:45] <Be-El> MaZ-: ceph df gives you an overview of your pools and their disk usage
[15:46] <MaZ-> yeah ceph df reports 19185G for the relevant pool
[15:46] <MaZ-> which doesn't add up
[15:46] <zidz> lathiat_: I've checked the logs, and a manual fun worked. Wrote that erlier :-)
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[15:47] <zidz> lathiat_: No errors in the logs though.
[15:47] <zidz> fun = run
[15:47] <Be-El> MaZ-: does the raw used value refer to other pools, too?
[15:48] <MaZ-> there's 0% used on all other pools and ~43% on the pool in question
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[16:09] <zidz> Now I see that the ceph-mon init script isn't included in the deb...
[16:09] <zidz> (Ubuntu 14.04)
[16:10] <MaZ-> think this might be caused by a ton of orphaned objects but gonna be hell trying to identify them :/
[16:10] <zidz> The only init script I find is /etc/init.d/ceph
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[16:15] <Be-El> MaZ-: i have a similar problem, but in that case the objects are trimmed to a size of
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[16:32] <ska> Short of using CLI with Calamari, is there any way to get PG data out of Calarmari?
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[17:16] <visbits> is it expected behavior that request get blocked during a recovery and you have to restart the osd that they are blocked on to clear it up
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[17:59] <MaZ-> hmm, weird, I have two very distinct sets of objects - some which follow a format which contains the rgw filename, like so: 'uk-new.321920.32__shadow_duplicity-full-****.vol2888.difftar.gpg.2~jB77ltiJ8WWgbYvJDZtLL5svLPytqm0.1_4' (which I'd expect to see, striped objects of the original files) and then an absolute ton which are like... uk-new.321920.121__shadow_.LWqpXoQi8KvIqDcSCROrJEqdgTFsr38_5 -
[17:59] <MaZ-> is there a relation between these?
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[19:18] <scott_> Hello, I have a few questions regarding Ceph performance. Reading the mailing list threads I noticed the highest throughput you will get is the first write to the first/primary OSD. Is this true, or does Ceph scale like ZFS or any other raid configuration. I can't seem to break 200Mb/s throughput when adding more OSD + Journels
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[19:20] <doppelgrau> scott_: sequential IO is a bit limited due to the architecture, but total IO scales well
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[19:20] <scott_> So sequential would be limited to the SSD on the journal?
[19:21] <doppelgrau> scott_: sequential is also limited to to the latencies: client -> primary -> copies -> ack back to primary (after write to log) -> ack to client (after write to log)
[19:23] <scott_> How would I measure total IO? The rados bench doesn't seem to increase when adding more SSD + Journals. Right now I have it 2:1 setup.
[19:24] <doppelgrau> scott_: increase parallel writes (more threads and/or run the banchmark on different hosts simultaniously
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[19:27] <scott_> What about the primaary OSD? If I have 10 VM's and 10 OSD will the primary also be osd.0, or were the RBD image selected the PG for the RBD image?
[19:30] <Kingrat> are you talking about 200mb/sec using the rados tool for benchmarks, or in the vm itself?
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[19:31] <doppelgrau> scott_: each PG has one primary osd, and each OSD is primary to mone PGs (on average proportional to the weight)
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[19:32] <Kingrat> also curious, how many pgs do you have per pool?
[19:32] <scott_> Both. I can sustain 200MB with DD with 4k write, and FIO matches.
[19:33] <scott_> I have a single pool for testing with about 600 PG, and 18 OSD.
[19:35] <Kingrat> you should use powers of 2 for the number of pgs
[19:35] <Kingrat> so 512 or 1024
[19:35] <Kingrat> you cant go down, but you could probably go up to 1024, you have enough osds
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[19:35] <Kingrat> im not sure that it is your only problem though
[19:36] <Kingrat> what is your network setup?
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[19:37] <scott_> Yea just noticed the power of 2 on the wiki. Currently 2x 10G nics that are bonded. Don't have public/cluster network seperate at this time, but I am not hitting anywhere near the cap.
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[19:38] <Kingrat> have you ran rados bench? create a temporary pool with like 512 pgs and use it
[19:39] <Kingrat> rados -p <poolname> bench 60 write --no-cleanup and then rados -p <poolname> bench 60 seq
[19:39] <Kingrat> and see what you get
[19:40] <Kingrat> i get over 400 easy sequentially on a 4x1ge bonded network, and around 140+ write with 3 replicas
[19:40] <scott_> Alrighyt let me run it, and I'll paste bin them for you.
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[19:44] <scott_> Alright, here are the results -> http://pastebin.com/JraQbjbT
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[19:45] <TheSov> if your ceph disks are on a raid card in jbod mode but have battery backed write cache, is it necessary to turn off the cache?
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[19:46] <Kingrat> TheSov, i use the write cache on my setup, and it depends, but i would suggest try it with and without
[19:47] <TheSov> does anyone here run ceph on raids?
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[19:48] <Kingrat> scott_, why did you do 64 threads?
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[19:50] <Kingrat> scott_, have you ran iperf to test network bandwidth between 2 nodes?
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[19:51] <scott_> Yea, I can disable the 64 threads. What I was using to test, but it uses 16 by default.
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[19:52] <TheSov> no one uses ceph on raids?
[19:52] <Kingrat> what kind of servers are you using? hbas?
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[19:53] <Kingrat> TheSov, you arent supposed to run it on top of raid arrays, but some servers you might have to configure each drive as a raid 0 array...i do
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[19:54] <TheSov> I've asked before and the deal here is we are going to have an intern dealing with the ceph cluster and we dont want the intern adding and removing osd's
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[19:54] <Kingrat> so maybe tell the intern that ceph is hands off for them?
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[19:55] <TheSov> the we want the intern to do that
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[19:55] <TheSov> but*
[19:55] <Kingrat> there isnt a good way to remove a failed osd and hot swap the drive for example, you should remove the failed osd and recreate it on the new drive
[19:56] <TheSov> Kingrat, i get that, thats what im trying to get around
[19:56] <Kingrat> whereas in many raid setups you can just remove the drive with the orange light and pop another one in and it takes care of it
[19:56] <TheSov> my option is to put ceph disks on raid
[19:56] <Kingrat> if you want replication on raid maybe ceph isnt the ideal solution?
[19:57] <Kingrat> because that isnt the ideal setup for ceph, you will end up with performance degradation when the arrays have bad drives and are rebuilding
[19:57] <TheSov> since we have 20 disk chassis i thought was to setup 4, 6 disk raid 5's on each chassis
[19:57] <Kingrat> as well as creating more points of failure and bottlenecks
[19:57] <TheSov> err 24 disk chassis
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[19:58] <TheSov> i see
[19:58] <TheSov> well we also like the idea of the SN storage scale out
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[20:14] <scott_> Kingrat, and Doppelgrau. Thank you for the information, it was very helpful.
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[22:48] <TheSov> holy moly dell is expensive these days
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[22:49] <TheSov> i just put together a price quote for a supermicro 24 disk unit using 6tb drives, 144tb raw for 10.2k and no one seems to be able to come close in pricing
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[22:55] <snakamoto> TheSov: do you know if those 6TB drives are SMR? (shingled)
[22:55] <TheSov> no clue
[22:55] <TheSov> here is a link
[22:55] <TheSov> http://www.newegg.com/Product/Product.aspx?Item=N82E16822236599
[22:56] <TheSov> woops
[22:56] <TheSov> i mean 4 tb
[22:57] <TheSov> let me get the 6tb one
[22:57] <snakamoto> looks like they are PMR. I was just curious if anyone has done testing with SMR drives. To me, logically, they should not work for random write workload
[22:57] <TheSov> ok here http://www.newegg.com/Product/Product.aspx?Item=N82E16822236737
[22:57] <TheSov> these are the 6tb
[22:58] <TheSov> same price
[22:58] <TheSov> 249
[22:58] <TheSov> so yes 144tb raw per unit at 10.2k
[22:58] <TheSov> 96gb of ram
[22:58] <TheSov> dual 6 core processor
[22:58] <TheSov> http://www.newegg.com/Product/Product.aspx?Item=N82E16816101704
[22:58] <TheSov> http://www.newegg.com/Product/Product.aspx?Item=N82E16819117403
[22:59] <TheSov> http://www.newegg.com/Product/Product.aspx?Item=N82E16820148646
[22:59] <TheSov> go nuts building these things, its practically free
[22:59] <TheSov> 1pb for 80k
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