#ceph IRC Log

Index

IRC Log for 2012-04-23

Timestamps are in GMT/BST.

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[6:05] <s[X]> hey all
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[11:25] <renzhi> is it possible to mix-and-match the underlying fs?
[11:26] <renzhi> for example, using btrfs on one node, and use xfs on another
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[12:06] <NaioN> renzhi: yes
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[12:08] <NaioN> you can choose a filesystem per osd
[12:09] <NaioN> the osd daemon just needs a directory on a filesystem, the filesystem needs to support xattrs
[12:09] <NaioN> but best practice is to use a filesystem per osd
[12:11] <renzhi> NaioN: thanks
[12:12] <NaioN> so you could build a cluster that can deal with fs bugs
[12:12] <renzhi> I'm trying to setup a cluster to do some test
[12:13] <renzhi> I have 3 machines now, thinking of having one which uses xfs instead
[12:14] <renzhi> Has anyone used ceph for something more serious than just testing?
[12:14] * LarsFronius (~LarsFroni@testing78.jimdo-server.com) Quit (Quit: LarsFronius)
[12:16] <NaioN> I'm using it for backups at the moment
[12:16] <NaioN> a lot of rsync backups
[12:16] <NaioN> but I use rbd's not cephfs
[12:17] <renzhi> NaioN: is rbd more stable?
[12:17] <renzhi> faster?
[12:17] <NaioN> it's more stable
[12:17] <NaioN> the rados part is stable
[12:18] <renzhi> i.e. the rados part can be considered production-ready?
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[12:19] <NaioN> well they removed the experimental warnings in 0.45
[12:19] <NaioN> and they want to deliver paid support for that part
[12:19] <renzhi> ok, sounds interesting
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[12:20] <renzhi> so rbd + xfs should be a go, at least for now?
[12:20] <NaioN> yes I experimented a while with it now and the rados/rbd part is stable for me
[12:21] <NaioN> I have a setup with OSD per disk formatted with XFS
[12:21] <NaioN> and rbd's to a intermediate server
[12:21] * steki-BLAH (~steki@91.195.39.5) Quit ()
[12:21] <NaioN> the rbd's are formatted with ext3 and the intermediate server runs rsync daemon
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[12:22] <renzhi> hey, cool to know
[12:23] <renzhi> how large is your backup storage? how many nodes?
[12:24] <NaioN> at the moment I've 3 nodes with 24 2TB disks each
[12:25] <NaioN> I've two heads (the intermediate servers)
[12:25] <NaioN> the rbds are connected to the heads and on the heads runs the rsync daemon
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[12:26] <renzhi> and you have been running this for how long?
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[12:26] <NaioN> I've about 250-300 rbd's connected evenly to the two heads
[12:27] <NaioN> I had a test-setup running for some months with about 100 rbd's
[12:28] <renzhi> and no major problems so far?
[12:28] <NaioN> no[e
[12:28] <NaioN> nope
[12:28] <NaioN> ofcourse some dead disks
[12:28] <NaioN> but no lost of data!
[12:28] <renzhi> cool
[12:29] <renzhi> we are trying to setup a storage for 500TB (and more later on), so I'm planning to do some really small scale testing now
[12:30] <NaioN> I've also experimented a lot with btrfs but didn't get it stable enough
[12:30] <NaioN> don't know with the newest kernels
[12:30] <renzhi> ok, good to know.
[12:31] <renzhi> I'm playing with wheezy, and btrfs 0.19 now
[12:31] <renzhi> anyway, thanks for sharing the info. I'm hoping to have something running soon, and we'll see
[12:32] <NaioN> cya
[12:32] <renzhi> need to take off now
[12:32] <renzhi> bye
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[15:02] <nhm> good morning folks
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[15:24] <s[X]> hey hm
[15:24] <s[X]> nhm*
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[15:28] <jluis> morning nhm :)
[15:28] * jluis is now known as joao
[15:29] <elder> joao, are your plans to travel firm yet?
[15:30] <joao> I'm going to check that with Mark today
[15:30] <elder> I kind of want to get my own plans settled today if possible.
[15:31] <joao> I expect to have it figured out before the standup
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[15:36] <nhm> elder: yeah, I was thinking I wanted to set thigns up today.
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[15:37] <joao> for what is worth, so do I :p
[15:37] <joao> although I'm yet to figure out where I'm staying
[15:38] <joao> it appears it's hard to book an hotel for 31 days
[15:43] <nhm> whoa, the University of Florida is dropping it's computer science program...
[15:45] <joao> is it that bad?
[15:46] <joao> I mean, the program...
[15:46] <nhm> sorry, I said that wrong. the whole department
[15:46] * f4m8 is now known as f4m8_
[15:46] <joao> that seems odd
[15:47] <nhm> ie cutting the graduate and research programs, laying off teach assistants, etc.
[16:10] <elder> Good thing I didn't get my degree from there...
[16:10] <elder> That is strange, considering recent news touting how computer science is one of the areas where the job market is better than most.
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[16:14] <nhm> elder: yeah. It seems really backwards.
[16:16] <filoo_absynth> hello all
[16:16] <joao> hi filoo_absynth
[16:17] <filoo_absynth> how is everything?
[16:17] <joao> good. you?
[16:20] <filoo_absynth> alright, i guess
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[16:26] <nhm> anyone else seeing 503 when trying to access gitbuilder?
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[16:34] <elder> nhm, this one: http://ceph.newdream.net/gitbuilder-deb-amd64/ ?
[16:35] <nhm> elder: yeah, along with atleast one other.
[16:35] <elder> Yes. I don't know how those things are configured, they may be co-hosted on the same hardware.
[16:35] <elder> http://ceph.newdream.net/gitbuilder-oneiric-apache2/
[16:35] <elder> http://ceph.newdream.net/gitbuilder-oneiric-modfastcgi/
[16:36] <elder> Those two too.
[16:36] <filoo_absynth> oh, by the way
[16:36] <elder> and http://ceph.newdream.net/gitbuilder-i386/
[16:36] <filoo_absynth> i'm looking for someone to build a fairly simple apache2.x module for a client of mine
[16:36] <filoo_absynth> do you happen to know someone who is available for freelance work?
[16:38] <nhm> elder: btw, I'm thinking write-through and no read ahead for SSD journals. Seem reasonable?
[16:38] <elder> For XFS?
[16:39] <nhm> elder: naw, just in in general.
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[16:41] <elder> Not much point in read-ahead. And as long as the SSD performs well for writes (and you size and align your I/O properly) then write-through is probably right too.
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[23:00] <elder> Anyone know why crush_find_rule() and crush_do_rule() are defined in net/ceph/crush/mapper.c?
[23:00] <elder> In ceph-client?
[23:00] <elder> They are unused.
[23:02] <sagewk> nope
[23:02] <elder> Is it ok to remove them?
[23:02] <sagewk> those files mirror ceph.git content, so delete them there too, if they are in fact unused
[23:02] <elder> Ahh.
[23:02] <elder> So otherwise maybe #ifdef kernel or something?
[23:02] <elder> (ifndef or whatever)
[23:02] <sagewk> hmm, aren't they used by net/ceph/osdmap.c ?
[23:03] <elder> That's actually another bug I was going to create. Last week Yahuda explained that there were 4 header files common between kernel and user space. Some of them have diverged slightly and I was going to reconcile that.
[23:03] <elder> Apparently there are some C files as well...
[23:04] <elder> Well that's interesting. Maybe the problem is they need to be exported. (sparse was what told me they were unused)
[23:05] <elder> I'll look a little more.
[23:05] <dmick> src/crush/CrushWrapper.h too
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