#ceph IRC Log

Index

IRC Log for 2012-10-20

Timestamps are in GMT/BST.

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[0:11] <cdblack> joshd you there?
[0:13] <joshd> cdblack: yeah, what's up?
[0:13] <cdblack> Finished the 1st round of 4k sequential on the 6-host CEPH cluster from the 4-host driver servers
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[0:14] <joshd> how'd it go?
[0:14] <cdblack> 48 workers against 12 rbds across 4 hosts yielded about 330k @ 1.3GB/sec
[0:15] <cdblack> I'm running the rest of the tests over the weekend, this was about 20% faster than .48
[0:15] <joshd> excellent
[0:15] <joshd> sam's working on even more improvements, but that's great
[0:16] <gregaf> oh, sequential
[0:16] <gregaf> I was wondering what that was run on!
[0:29] <cdblack> joshd: just sent a screen shot of the panic I got on one of my load generators as it was writing 4k sequential, let me know if there's anything interesting there you want to see... It's Friday, don't forget the weekend! ;-)
[0:31] <joshd> cdblack: thanks! that looks like something that may be fixed in a later kernel, but if you could grab the backtraces from syslog we could make sure
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[0:34] <cdblack> <----- Linux Noob, can you refresh my brain as to how to do that?
[0:35] <joshd> if that machine is still usable, you can grab the /var/log/kern.log file
[0:37] <cdblack> locked up cold, had to press the power button
[0:37] <joshd> well, you can see it was able to save the crash info to that file before locking up entirely
[0:38] <cdblack> cool, will scrape & send! Thanks man!
[0:38] <joshd> you're welcome :)
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[2:46] <jefferai> cdblack: what version was this?
[2:46] <jefferai> also, what are you doing in the 4k sequential?
[2:47] * jefferai is very interested in performance tuning as he'll have 20Gb/s data rate available to each server
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[3:16] <liiwi> 1~/win 20
[3:17] <liiwi> blerp
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[9:01] <cowbell> yay ceph! 8)
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[11:48] <jtang> two of my work colleagues are going to the ceph workshop next month
[11:48] <jtang> :)
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[11:51] <joao> cool
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[11:56] <jtang> i was just at a PASIG conference last week
[11:56] <jtang> i was wondering if its possible to add end to end checksumming in ceph
[11:57] <jtang> ceph seems to do some basic crc/hashes at the object level is that correct?
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[12:12] <joao> jtang, I'm not entirely sure, but I believe the journal does indeed have crcs, and then it will be the underlying responsibility to keep crcs
[12:12] <joao> but I'm basing my opinion on the meager work I did in the osd subsystem from a couple of months ago
[12:14] * joao should start writing this stuff somewhere as these questions tend to pop up from time to time :)
[12:39] <jtang> joao: ok, i shuold really poke around the code before ask some of these questions
[12:40] <jtang> given how 'intelligent' the osd's are already, i was just thinking of adding functionality to the cephfs system so whenever i write or read a file i can get the hash of it both at the fs level and all the way down to the object level
[12:40] <jtang> though im not sure how one might do it or what the scheme might look like
[12:41] <joao> jtang, maybe sjust and slang could point you out on the right direction
[12:42] <joao> they're probably the guys you would want to talk to about the osd and cephfs
[12:42] <jtang> i basically want the zfs on read checksumming of my data
[12:42] <jtang> the zfs feature that is
[12:43] * jtang still has a hangover so im not thining straight
[12:43] <joao> lol
[12:44] <jtang> how does on log feature requests?
[12:44] <joao> tracker
[12:44] <joao> http://tracker.newdream.net/
[12:44] <jtang> i guess i need to read that more often then
[12:45] <jtang> i want cluster to cluster features too ;)
[12:45] <jtang> there is a huge gaping hole in that area (i think)
[12:45] <jtang> i get the impression adding cluster to cluster capabilities shouldn't be a huge task
[12:45] <jtang> but a tricky one to get right
[12:46] <jtang> i'd love to have the capability to run two independent clusters and then be able to 'sync' pools of data between clusters
[12:46] <jtang> it'd solve a bunch of headaches that im going to have in a year or two's time
[12:47] <jtang> actually it would solve some headaches now
[12:49] <joao> I guess it all comes down to the available resources to not only implement it and then QA it
[12:50] <joao> s/and/but
[12:51] <jtang> i should probably log some feature requests or at least look at whats there already
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[15:44] <jtang> has anyone looked at integrating ceph into a tiered storage system ?
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[22:29] <sage> renzhi: do you still have pgs that are remapped? if you don't mind, i'd like to take a closer look to see why that happened
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[23:19] <jks> I've upgraded ceph on my machines, but I haven't upgraded qemu itself. Now when I do a savevm to snapshot a vm with an rbd image - qemu segfaults. Am I supposed to recompile/upgrade qemu somehow after upgrading ceph?
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