#ceph IRC Log

Index

IRC Log for 2012-05-15

Timestamps are in GMT/BST.

[0:00] * nhm grumbles about stupid megaraid.
[0:07] <dmick> HATE
[0:13] * liiwi giggles on T2 issues
[0:13] <liiwi> sorry, that's mean
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[0:40] * danieagle (~Daniel@177.43.213.15) Quit (Quit: Inte+ :-) e Muito Obrigado Por Tudo!!! ^^)
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[0:55] * Qten (~qgrasso@ip-121-0-1-110.static.dsl.onqcomms.net) has joined #ceph
[0:58] <Qten> Has anyone tried using "ZFS on Linux" (zfsonlinux.org) with ceph?
[0:58] <joshd> I think someone's asked that question before, not sure if was ever tried
[0:58] <Qten> seems to have a bit of backing from luster/whamcloud
[0:59] <Qten> hrmm might give it a try myself then :)
[0:59] <Qten> the port seems pretty good from my inital testing
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[1:04] <gregphone> elder: nhm: retrospective?
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[5:08] <Qten> journals inside ceph.conf arnt required when used with brtfs? what about zfs as well?
[5:21] <dmick> Qten: zfs isn't known, but IIRC ceph has behavior specific to btrfs when it senses it
[5:25] <Qten> sigh, going to be years until btrfs is going to considered "stable" by the majority i would imagine.
[5:26] <dmick> well, we and the btrfs team are optimistic. By 'behavior specific', I mean it can avoid certain sync operations because btrfs handles them
[5:26] <dmick> (handles consistency, I mean to say)
[5:27] <Qten> don't get me wrong i'm keen to try it just thinking from a production point of view is all
[5:27] <Qten> sounds interesting tho
[5:27] <dmick> AFAIK journals are still a good idea even on btrfs; certainly when I run with btrfs I run with journals
[5:27] <Qten> fair call
[5:33] <Qten> i was having skim in the docs does anyone know if we have any offsite replication features yet?
[5:43] <joao> Qten, ceph doesn't require journals when using btrfs because it takes advantage of btrfs' snapshotting capabilities
[5:44] <joao> if you can do the same with zfs, you may check the code and add support for it
[5:44] <joao> :)
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[7:26] <Qten> joao: thanks :)
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[10:06] <zykes> anyone here using RBD and openstack ?
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[10:50] <zykes> is there any way I can mount a raods fs on multiple nodes ?
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[13:42] <nhm> morning #ceph
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[14:05] <liiwi> good afternoon
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[17:21] <joao> morning #ceph
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[18:18] <sagewk> elder: around?
[18:18] <elder> yes
[18:22] <gregaf> zykes: what do you mean a rados fs?
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[18:26] <sagewk> elder: time for a quick skype?
[18:26] <elder> Sure. I have to go to my other computer. Just a sec.
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[18:51] <Tv_> sagewk: i still can't find a way to piece together the ceph-mon features for an automatic cluster bringup
[18:52] <Tv_> sagewk: largely because i don't see how a mon would ever find out about other mons after the initial mkfs
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[19:00] <sagewk> tv_: either explicit mon_host in environment, or a chef query?
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[19:03] <Tv_> sagewk: if i mkfs, start the daemon, change ceph.conf mon_host to add new addresses, make daemon reload/restart, will it pick those up?
[19:03] <Tv_> i thought it relied purely on monmap after mkfs
[19:03] <Tv_> even then, the reload part is fugly
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[19:06] <sagewk> the existing daemons won't, but the new ones will probe the old ones and join the quorum
[19:06] <sagewk> ...at which point the old ones will know
[19:06] <Tv_> if the chef search deemed to give them addresses of the "old" nodes, at the time they were mkfs'ed
[19:06] <Tv_> that thing has an update delay
[19:07] <Tv_> i'm worried about adding ceph-mon roles to a bunch of machines, each one seeing the search come out empty for a while, etc
[19:07] <gregaf> sagewk: the problem is that if you have a single-node mon cluster at bootup, and then two new nodes come up that think they're both in the cluster, they're perfectly capable of creating a new quorum with each other and crashing
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[20:19] <Tv_> sagewk: http://tracker.newdream.net/issues/2418 http://tracker.newdream.net/issues/2419
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[22:58] * Disconnected.
[22:58] -coulomb.oftc.net- *** Looking up your hostname...
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