#ceph IRC Log

Index

IRC Log for 2013-02-10

Timestamps are in GMT/BST.

[0:01] <Kdecherf> Hm, I have an interesting behavior between one osd and the active mds
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[0:02] <Kdecherf> osd sends a lot of data (~250Mbps, 100*normal activity) to the mds on each two~three seconds
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[0:22] <CrashHD> hmm wonder why oftc keeps kicking me
[0:32] <Kdecherf> hm, one of the osd doesn't see one of other osd, and i don't know why
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[0:43] <ShaunR> CrashHD: according to your quit message your getting a ping timeout
[0:43] <CrashHD> what's interesting is none of my other irc connections are dropping (same client)
[0:44] <ShaunR> maybe the server your on is having issues, try a different one?
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[4:34] <CrashHD> argh
[4:34] <CrashHD> what is wrong with this network lol
[4:34] <CrashHD> pings didn't drop to the server or anything
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[15:42] <loicd> Anyone willing to review https://github.com/ceph/ceph/pull/44/files ?
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[17:32] <madkiss> could somebody please refresh my memory? For Ceph to consider a writing process finished on the client side, the data to be written must have hit the journals of as many OSDs as the replication level defines, right?
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[18:18] <Robe> madkiss: IIRC yes
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[18:27] <madkiss> Robe: thanks
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[19:17] <noob2> does the rados gateway have a 1GB file upload limit?
[19:17] <noob2> it seems to give me a bad request error when i try to push a file larger than that
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[20:26] <CrashHD> hello
[20:26] <CrashHD> hows it going
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[20:45] <CrashHD> can you get mkcephfs skip hosts it has already succeeded on?
[20:45] <CrashHD> if you run in to an error and need to rerun it?
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[21:03] <CrashHD> I swear this network nates me
[21:03] <CrashHD> *hate
[21:07] <noob2> i'm not sure but that's a good question
[21:17] <CrashHD> I suppose
[21:18] <CrashHD> I'm having problems getting ceph deployed in the most basic sense across threee dev hosts
[21:18] <CrashHD> it's learning curve stuff
[21:18] <CrashHD> but having to go back and clear out directories each time is...not ideal
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[21:38] <CrashHD> relaxing sunday for everyone?
[21:43] <CrashHD> anyone else have trouble getting ceph up and running for the first time?
[21:43] <CrashHD> I can't imagine it's as hard as I'm making it out to be
[21:45] <phillipp1> noob2: do you run apache2?
[21:47] <jks> CrashHD, it was quite easy for me.... I just followed the guide
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[21:47] <CrashHD> jks: interesting, I'm doing the same
[21:47] <CrashHD> ubuntu?
[21:47] <jks> Fedora
[21:48] <CrashHD> any auth issues?
[21:48] <CrashHD> with cephx?
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[21:51] <jks> nope
[21:52] <CrashHD> hmmmmm
[21:52] <CrashHD> I can't be this slow lol
[21:52] <CrashHD> you make your own fs or did you rely on --mkfs?
[21:52] <jks> made my own
[21:54] <CrashHD> I disabled auth and I seem to be ok
[21:54] <CrashHD> probably something I don't understand about cephx
[21:54] <CrashHD> anyone have any ideas on latency?
[21:55] <CrashHD> I didn't see a lot of detail about io latency in any of the material I could muster up online
[21:55] <jks> it will depend on your hardware
[21:55] <CrashHD> understood
[21:55] <CrashHD> referring more to overhead
[21:55] <CrashHD> say given direct access was 10ms
[21:56] <CrashHD> accessing through ceph = ?
[21:56] <jks> it doesn't make sense to ask that way
[21:56] <jks> it depends on tonnes of stuff
[21:56] <jks> like for example your network.. is it GigE, 10 GigE, IB or ...
[21:57] <CrashHD> totally understand the variables
[21:57] <CrashHD> guess I'm trying to get a sense of how ceph stacks up against netapp, isilon, emc -- primary storage
[21:57] <jks> you have to try it out on your own hardware to get a sense on what it can do
[21:57] <CrashHD> with regard to latency
[21:57] <jks> it depends on a lot of stuff like if you have SSDs, what speed they are, the number of osds, etc. etc.
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[22:14] <noob2> phillipp1: yes i do
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[22:19] <CrashHD> lol
[22:19] <CrashHD> I get ceph up and running
[22:19] <CrashHD> 3 nodes
[22:19] <CrashHD> reboot a note during a write process
[22:19] <CrashHD> and the whole thing fails
[22:19] <CrashHD> hmmmm
[22:20] <CrashHD> this pretty common?
[22:20] <CrashHD> .56.2
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[22:21] <Vjarjadian> CrashHD, did you follow a guide?
[22:21] <CrashHD> ya
[22:21] <CrashHD> the ceph guide
[22:21] <noob21> that's no common no
[22:21] <noob21> not*
[22:21] <CrashHD> the 3 nodes were working fine
[22:21] <CrashHD> it was really the client that failed
[22:22] <CrashHD> err the node with the client mounting to itself
[22:22] <CrashHD> rbd
[22:22] <noob21> what ubuntu is the client running?
[22:22] <CrashHD> 12.10
[22:22] <CrashHD> fresh installs of everything
[22:23] <CrashHD> distro repos when possible
[22:26] <CrashHD> does a single instance of osd multithread (take advantage of multiple cpus)?
[22:26] <CrashHD> and how does the block locking work with rbd
[22:26] <CrashHD> can multiple hosts access the same rbd image like a shared scsi bus?
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[22:31] <CrashHD> hmmm
[22:34] <CrashHD> I had the filesystem mounted
[22:34] <CrashHD> not just rbd
[22:34] <CrashHD> I'm assuming the filesystem component is what fubar
[22:35] <mikedawson> CrashHD: look at Ceph's locking and fencing features http://comments.gmane.org/gmane.comp.file-systems.ceph.devel/7094
[22:35] <CrashHD> tried to recreate with no filesystem mounted and it survived the reboot fine
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[22:36] <CrashHD> mikedawson: does this translate in to traditional scsi locking (shared buses)?
[22:37] <mikedawson> mikedawson: no
[22:37] <mikedawson> CrashHD: no
[22:37] <CrashHD> so in general, no scsi style shared buses?
[22:38] <CrashHD> like you could use to format with gfs or something
[22:38] <CrashHD> vmfs etc
[22:40] <mikedawson> CrashHD: cephfs is a posix filesystem on top of ceph
[22:41] <CrashHD> cephfs is, but what about serving raw block devices through proxies to say a vmware cluster and have it format with vmfs
[22:41] <CrashHD> or more local, using gfs against rbd images on multiple servers
[22:42] <mikedawson> CrashHD: http://www.hastexo.com/resources/hints-and-kinks/turning-ceph-rbd-images-san-storage-devices
[22:42] <CrashHD> interesting
[22:42] <CrashHD> I'll take a look
[22:42] <CrashHD> ahh
[22:42] <CrashHD> but 'node'
[22:42] <CrashHD> not 'nodes'
[22:43] <CrashHD> I remember reading this
[22:43] <CrashHD> it looked to be a single proxy
[22:43] <CrashHD> solely mounting rbd images
[22:43] <CrashHD> creating a single point of failure
[22:44] <CrashHD> if you could treat rbds like shared scsi, then you could take advantage of block oriented multipathing etc from more traditional types of hosts
[22:44] <mikedawson> CrashHD: read last paragraph
[22:45] <CrashHD> hmm pacemaker
[22:45] <CrashHD> intersting
[22:45] <CrashHD> active/passive
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[22:46] <CrashHD> in the fc/iscsi world though you couldn't present a path through lio as being 'inactive' or 'down' without access to the dev I don't think
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