#ceph IRC Log

Index

IRC Log for 2012-05-30

Timestamps are in GMT/BST.

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[0:24] <elder> sagewk, are you around?
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[0:25] <sagewk> elder: yeah
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[0:35] <sbohrer> darkfader: I can open a feature request, but I'm not positive what my feature exactly needs to be.
[0:36] <sbohrer> darkfader: I'm still new to ceph, so I'm not sure if just the ceph-mon processes need to be able to listen on multiple interfaces or if the osd and mds daemons would need that as well.
[0:36] <darkfader> maybe we can try discussing it. i also have a vague idea about multihomed things
[0:36] <darkfader> but err, not today, its too late already
[0:36] <sbohrer> darkfader: I worked around the problem for the moment by setting up a server to route traffic between my IB and 1G subnets
[0:37] <darkfader> so you have some hosts that have IB and some that don't? correct?
[0:37] <sbohrer> yes
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[0:37] <darkfader> oki pretty similar
[0:38] <darkfader> and do you care about the IB hosts to keep talking over ethernet if IB goes down?
[0:39] <darkfader> (otherway round with switching from ethernet to IB only if there is a failure would be pretty useless)
[0:39] <darkfader> or do you have bonded IB links and different switches and all that?
[0:39] <sbohrer> that would be nice if that worked, but I'm not sure if that is a requirement
[0:40] <sbohrer> It is all different switches
[0:40] <darkfader> nice
[0:41] <darkfader> i only have one IB switch so i'm thinking about what would happen if it failed
[0:41] <darkfader> since the ethernet would still be right there to use
[0:41] <darkfader> but it's also not a really important thing for me
[0:41] <darkfader> i dont plan on doing much async writes
[0:42] <darkfader> well maybe we meet here tomorrow and then we can try to write down something
[0:42] <sbohrer> sure sounds good
[0:42] <darkfader> just the most important request i guess
[0:43] <darkfader> (hehe would that be mds access over rdma by chance?)
[0:44] <sbohrer> mds access over rdma would be another feature request for sure
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[5:10] <HellTiger> hi
[5:11] <HellTiger> can i use ceph to sync files to different cloud storage providers simultaneously?
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[5:35] <iggy> HellTiger: not really
[5:36] <HellTiger> ok, iggy the apt-cache show cmd in ubunut isnt that well then
[5:36] <HellTiger> thanks cya
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[5:37] <iggy> there's a faq about that... basically it comes down to ceph expects high bandwidth/(relatively) low latency between osds
[5:37] <iggy> okay...
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[13:30] <andy8788> Hi! Is there anyway to access Ceph FS directly from C/Java without mounting?
[13:32] <ninkotech> or python?
[13:32] <andreask> http://ceph.com/docs/master/api/
[13:33] <ninkotech> nice!
[13:35] <andy8788> thanks. But isn't it for more like RADOS? I don't see methods to create/delete files?
[13:35] <andy8788> More like APIs for accessing the object-based storage system
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[13:39] <andy8788> I want to access things like directory listing, file creation deletion. It appears that the only way to do it now is through mounting?
[13:41] <andreask> accessing files and dirs ... hmm, yes ... then these libraries won't help you much
[13:53] <krisek> hi, I have a small issue with s3 access via radosgw, it works seamless with the modified libs3 client from wido, but no success with s3cmd or dragondisk
[13:53] <nhm> good morning #ceph
[13:54] <krisek> all my requests except of listing buckets fail
[13:54] <krisek> with access denied
[13:56] <krisek> it looks like that the Auth header is generated in a different way in the clients
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[13:57] <nhm> krisek: there was some talk yesterday about a bug with double headers being sent, but honestly I wasn't paying too much attention.
[13:58] <krisek> according to my tcpdump the Authorization header is sent only once by both s3 and s3cmd
[14:03] <krisek> I wonder if there were a configuration option for radosgw what kind of authentication to use
[14:14] <nhm> krisek: yehuda is probably the guy to talk to.
[14:15] <nhm> krisek: I think he's usually in around 4 hours from now.
[14:15] <nhm> looks like he's on IRC right now though (yehudasa) so maybe he'll respond earlier if he sees it.
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[14:19] <krisek> ok many thanks
[14:20] <krisek> in the meanwhile I'll try to analyze it more
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[17:47] <sagewk> elder: there?
[17:47] <elder> yes
[17:48] <sagewk> elder: do you think we should rebase master on 3.4, merge 3.4 back into master, or leave as is?
[17:49] <elder> Merge master into 3.4 and make the result the new master (I think?).
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[17:50] <elder> I have to pull my brain out of the depths for a minute to try to recall.
[17:51] <sagewk> elder: no worries, i'll just send the current master upstream for now, we can merge-back later if necessary
[17:52] <Tv_> this morning's blurry thought: "CephLogBot" sounds like "Cephalopod"
[17:53] <Tv_> if it was doing more than logs, it should be called Cephalobot
[17:53] <elder> Are you even awake yet?
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[17:54] <elder> If you put the 'a' in there I guess it's a little closer. But it didn't "sound" that alike to me (otherwise)
[17:54] <Tv_> ceph..lo..[pb]o[dt]
[17:55] <elder> sagewk, I think that approach will do just fine and I think Linus likes things that way.
[17:55] <joao> cephlopot?
[17:55] <elder> Once he pulls in we can just make our master be 3.5-rc1 and go from there.
[17:56] <elder> cephalaplogger
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[18:04] <nhm> elder: how much do you know about cfq?
[18:04] <elder> Well, not a lot. But it's "completely fair"!!!
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[18:06] <nhm> elder: ok. Trying to figure out if a pause after a cfq schedule dispatch is more a symptom of a lack of write activity or potentially caused by something happening because of the dispatch.
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[18:08] <elder> Good question, and without spending a little time on it I can't give you an answer. It may not take long but I'm kind of deep in the middle of my messenger coding right now.
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[18:10] <nhm> elder: no worries. Btw, I just started reading up on some of the things SGI is doing with inode32 and rotorstep to get good locality benefit from sequentially written files like inode64.
[18:10] <nhm> (with XFS)
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[18:31] <elder> I think that may have been an option we had internally that had not been pulled into mainline for some reason, nhm.
[18:31] <elder> Sounds familiar anyway.
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[21:09] <Tv_> note to self: size of qcow2 container != size of vm disk image
[21:15] <liiwi> heh, been bitten by that too
[21:30] <liiwi> heh, http://www.tinkergeek.com/?p=155
[21:33] <liiwi> are there any known issues/limitations with software that uses lots of locking (svn be the first example), and ceph?
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[21:44] <Tv_> liiwi: locking slows such a system down (not all that scalable), lots of lock contention is the classic source of bugs, but It Should Just Work(tm) as much as the Ceph DFS is ready (which it is not ;)
[21:46] <joshd> the other limitation is that ceph-fuse doesn't support it
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[21:47] <joshd> http://www.tracker.newdream.net/issues/414
[21:48] <liiwi> ok, thanks :)
[21:48] <liiwi> http://code.google.com/p/xtreemfs/issues/detail?id=230
[21:49] <elder> sagewk, yehudasa I have posted a set of 13 ceph client patches to the mailing list for review. They are available as the first 13 of the last 14 commits here: https://github.com/ceph/ceph-client/commits/testing-next
[21:50] <elder> I am doing a smoke test and will await review comments before I commit to the testing branch.
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[21:50] <dmick> "As an exercise in excitement, let???s try making it happen." heh.
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[22:29] * nhorman (~nhorman@99-127-245-201.lightspeed.rlghnc.sbcglobal.net) Quit (Quit: Leaving)
[22:31] * krisek (~krisek@www.nowhere-else.org) Quit (Remote host closed the connection)
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[23:02] * LarsFronius (~LarsFroni@95-91-243-252-dynip.superkabel.de) Quit (Quit: LarsFronius)
[23:04] <Tv_> i hate libraries with decently-defined error handling that still spam stderr
[23:05] <dmick> "I just thought you might want to know. By the way, here's my card. Call me!"
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