#ceph IRC Log

Index

IRC Log for 2013-07-05

Timestamps are in GMT/BST.

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[8:54] <trond> Hi, i have a question about monitor. When a monitor node goes down we experience latency in the cluster, to the point that our service are acutally down. Has anyone tested High Availability solutions like heartbeat with a monitor to allieviate this problem?
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[9:09] <phantomcircuit> trond, how many monitors do you have
[9:09] <phantomcircuit> and are they on dedicated nodes?
[9:10] <trond> 3 monitors, 2 of them are on same host as osd's. The third resides in a vm on a third node.
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[9:11] <trond> in total 3 physical nodes.
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[9:18] <phantomcircuit> trond, i'd advice you to put them on dedicated machines
[9:18] <phantomcircuit> something really lightweight will do
[9:18] <phantomcircuit> i use atom boxes
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[9:39] <trond> That won't solve my problem. As when a monitor goes down some ceph client requests will time out and cause latency. Though the need for maintenance will go down.
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[9:45] <tnt> mmm, if only 1 mon is down that shouldn't cause time outs
[9:48] <trond> The rbd client will look for which monitor to use in ceph.conf, where the down monitor still is mentioned.
[9:49] <trond> http://ceph.com/docs/next/rados/troubleshooting/troubleshooting-mon/#latency-with-down-monitors
[9:49] <trond> This isn't doable with hundreds of virtual machines.
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[9:51] <phantomcircuit> trond, that should only matter when you're starting the vm
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[9:53] <trond> Okay, so it isn't doable a all then, I was thinking along the lines of laodbalancing or hearbeat to fail over the monitor ip address to another living monitor
[9:54] <tnt> The vm will take a few more seconds to start until it discover alive monitor ... not a big deal.
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[9:55] <trond> Yeah, but what if I have to take down the monitor that VM is using specified by -m?
[9:55] <tnt> If the VM is booted, it will know _all_ monitors.
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[10:16] <LiRul> hi
[10:17] <LiRul> can i rename bucket via radosgw?
[10:17] <LiRul> via swift or s3api
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[10:32] <mxmln> hi cephfolks which file format do you use for your vm's within rbd? I had several file system problems with qcow2 which was imported using qemu-img into rbd block device
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[10:58] <joelio> mxmln: raw
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[11:06] <tnt> yeah, inside RBD they're raw ...
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[14:00] <loicd> is there someone interested in erasure coding and willing to review https://github.com/dachary/ceph/blob/wip-4929/doc/dev/osd_internals/erasure-code.rst ?
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[14:11] <LiRul> is there any limit or recommendation to number of objects in single container (on rados)?
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[16:57] <mozg> hello guys
[16:58] <mozg> does anyone know if I add [client] rbd_cache = true setting in ceph.conf would I need to restart any of the osd services
[16:58] <mozg> or would this option be automatically taken into account at the next client rbd access?
[16:58] <mozg> how does work?
[16:59] <tnt> you need to add this on your _clients_ ... not the osds.
[16:59] <tnt> and it will take effect when your client reads the config on startup.
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[17:06] <mozg> tnt: thanks
[17:07] <mozg> so, i would need to reboot the client's server, right? Coz the client doesn't really run any of the ceph services, does it?
[17:08] <tnt> !??
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[17:48] <mozg> tnt: what i mean is after changing the rbd cache setting in the ceph.conf , do I need to do anything on the client side for the settings to take place?
[17:48] <mozg> i've got vms running on ceph
[17:48] <mozg> should I simply stop & start all vms for the cache settings to take effect with vms?
[17:50] <tnt> yes, restar the qemu-kvm process should do the trick.
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[18:15] <mozg> tnt: got disconnected. Many thanks for help
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[19:14] <mozg> guys, do you know if i can independently storage data on ceph using rbd and ceph-fuse mounted data?
[19:15] <mozg> i need to backup some data from one of my servers
[19:15] <mozg> into ceph
[19:15] <mozg> however, I do use ceph for storing kvm images with rbd
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[19:28] <sagewk> yes
[19:28] <sagewk> data goes in different pools
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[19:53] <paravoid> sjustlaptop: hey
[19:53] <sjustlaptop> paravoid: hi
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[19:54] <paravoid> so, I have some... not so great news :)
[19:55] <sjustlaptop> ?
[19:55] <paravoid> I upgraded everything to basically next
[19:55] <paravoid> including the log rewrite stuff
[19:55] <paravoid> and I'm still seeing the same effects
[19:55] <sjustlaptop> hmm
[19:55] <paravoid> first restart peers slowly, subsequent ones peer immediately
[19:56] <sjustlaptop> how slow is slowly?
[19:56] <paravoid> 2'?
[19:56] <paravoid> 3 maybe
[19:56] <paravoid> that's for just peering, then another one or two for all active ones to get active+clean
[19:56] <paravoid> subsequent restarts are fast with both peering/active
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[19:58] <paravoid> 11ccb1d is what I'm currently running
[19:58] <paravoid> that's HEAD^
[19:58] <paravoid> er, next^ even
[19:59] <paravoid> that's a lie, it's wip-5460
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[20:01] <sjustlaptop> there doesn't seem to be a wip-5460 pushed
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[20:01] <paravoid> it was, it got merged
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[20:02] <paravoid> 11ccb1d1433bf269e6a523e904d84a56f5b6c94a is the full commit id
[20:02] <paravoid> it contains baa1c86e45d935143a888608cffd1f7b42037f8f
[20:02] <paravoid> Merge remote-tracking branch 'upstream/wip-log-rewrite-sam'
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[20:07] <Karcaw> is there an eay way with a ceph command to get the fill level of every osd?
[20:08] <sagewk> ceph pg dump osds --format=json
[20:09] <Karcaw> thanks
[20:09] * guppy looks at unit3
[20:09] <unit3> Anyone seen an issue on centos6 where using ceph-deploy to activate an osd doesn't actually do anything? I've been able to manually run ceph-osd with the correct id, and then "ceph osd in" it, so the initialization worked.
[20:10] <unit3> but no amount of "activate" actually gets it running via init scripts.
[20:12] <unit3> hmmm and even with 4 OSDs active and in, the initial pgmap of 192 gps seems to be stuck in "creating".
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[20:13] <unit3> Maybe I'll just create a new cluster, see if that sorts it out.
[20:17] <fireD1> unit3: instead of single step ceph-deploy osd create try with two step ceph-deploy prepare and ceph-deploy activate
[20:18] <unit3> fireD1: sorry, to be clear, that's what I've been doing. and it's the activate stage that fails. prepare seems fine, all expected files created.
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[20:23] <fireD1> look into ceph.log and see if there's anything useful
[20:25] <sjustlaptop> paravoid: exactly how did you test it?
[20:25] <sjustlaptop> paravoid: that patch would have had to have been running for a while to have fixed the problem, I think
[20:25] <unit3> huh. I did a ceph-deploy purgedata, then ceph-deploy new and ceph-deploy mon create... and the "new" cluster shows all the old osds as up and in, even though they're definitely not.
[20:26] <unit3> I think I'm very confused as to how ceph keeps track of cluster state.
[20:26] <paravoid> sjustlaptop: how much is a while?
[20:26] <paravoid> sjustlaptop: it was recovering from a degradation for something like 24h
[20:26] <paravoid> I can put some i/o over it over the weekend and retry on monday
[20:26] <sjustlaptop> paravoid: actually, I'm wrong, should have been effective pretty much immediately
[20:26] <sjustlaptop> paravoid: though that wouldn't hurt
[20:26] <sjustlaptop> on monday we'll have to get logs and try again
[20:27] <paravoid> the effect was exactly the same though
[20:27] <sjustlaptop> yeah
[20:27] <paravoid> (on an unrelated note, I have two inconsistent pgs and "ceph pg repair" is getting completely ignored)
[20:28] <paravoid> maybe reached max scrubs?
[20:30] <unit3> ahhh, purgedata didn't run the first time. now it's ran, but then "ceph-deploy new" doesn't re-create config dirs and stuff. Is there a ceph-deploy command to recreate /etc/ceph, and /var/lib/ceph structures?
[20:33] <unit3> fireD1: back to the point where I'm creating OSDs, same problem, and ceph.log doesn't have anything useful.
[20:34] <unit3> there is an "osd-admin.log" which has a ceph-osd pid, and then the ceph-osd usage, as if it had been called with incorrect values.
[20:35] <unit3> hmmm... and ceph-deploy purge has removed the init script, and ceph-deploy new / mon create hasn't recreated it. have to reinstall the packages to get that one back, I guess.
[20:36] <unit3> oh, it's just the osd part that's missing. job's still there.
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[20:43] <grepory> if we need to expand a pool in cuttlefish, can we now safely change the number of placement groups in the pool? and does that do anything crazy on the back side that we should be aware of?
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[21:31] <sagewk> grepory: yeah it's safe, just be warned that it will move a lot of data (unless you slowly ramp it up)
[21:36] <grepory> sagewk: oh!
[21:36] <grepory> so it automatically re-balances across the new pgs?
[21:37] <grepory> sagewk: and when you say "slowly ramp it up" do you mean slowly increase the number of placement groups incrementally?
[21:40] <sagewk> right
[21:40] <grepory> outstanding, thank you, sir.
[21:41] <sagewk> np
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[23:12] <mozg> anyone know how can I copy multiple files at a time using rbd?
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