#ceph IRC Log

Index

IRC Log for 2014-01-31

Timestamps are in GMT/BST.

[2:44] -graviton.oftc.net- *** Looking up your hostname...
[2:44] -graviton.oftc.net- *** Checking Ident
[2:44] -graviton.oftc.net- *** Couldn't look up your hostname
[2:44] -graviton.oftc.net- *** No Ident response
[2:44] * CephLogBot (~PircBot@92.63.168.213) has joined #ceph
[2:44] * Topic is 'Latest stable (v0.72.x "Emperor") -- http://ceph.com/get || dev channel #ceph-devel || New Ceph Use Cases: http://ceph.com/use-cases/ email community@ceph.com to add yours!'
[2:44] * Set by scuttlemonkey!~scuttlemo@c-69-244-181-5.hsd1.mi.comcast.net on Mon Jan 06 18:00:47 CET 2014
[2:45] * xmltok (~xmltok@cpe-76-90-130-65.socal.res.rr.com) Quit (Quit: Leaving...)
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[7:27] * sjusthm (~sam@24-205-43-60.dhcp.gldl.ca.charter.com) Quit (Remote host closed the connection)
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[9:00] * AfC (~andrew@2001:44b8:31cb:d400:6e88:14ff:fe33:2a9c) Quit ()
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[9:01] * thb is now known as Guest690
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[9:55] <rotbeard> hi there. is there any documentation around how to manually set up a mds?
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[9:57] * topro (~prousa@host-62-245-142-50.customer.m-online.net) Quit (Read error: Connection reset by peer)
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[10:10] * Guest690 is now known as thb
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[10:32] * zack_dolby (~textual@e0109-114-22-3-254.uqwimax.jp) Quit (Quit: My MacBook has gone to sleep. ZZZzzz???)
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[10:51] * sarob (~sarob@c-50-161-65-119.hsd1.ca.comcast.net) Quit (Ping timeout: 480 seconds)
[10:51] * LeaChim (~LeaChim@host86-174-30-7.range86-174.btcentralplus.com) has joined #ceph
[10:53] * Siva (~sivat@vpnnat.eglbp.corp.yahoo.com) Quit (Quit: Siva)
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[11:07] * emv (~quassel@91.177.37.241) has joined #ceph
[11:09] <emv> following an article about rbd replication: http://www.rapide.nl/blog/item/ceph_-_rbd_replication.html
[11:11] * mikedawson (~chatzilla@c-98-220-189-67.hsd1.in.comcast.net) has joined #ceph
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[12:28] * beardo (~sma310@beardo.cc.lehigh.edu) Quit (Ping timeout: 480 seconds)
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[13:58] <alphe> hello everyone
[13:59] <alphe> by mistake I started erasing the disk of one of my osd
[13:59] <alphe> then I zapped it
[13:59] <alphe> I removed the osd from crushmap and osdmap
[14:00] <alphe> and recreated the osd with ceph-deploy disk prepare node:disk
[14:01] <alphe> then i did a ceph-deploy osd activated node:diskPart1 and it fails with the osd exists but the key doesn t match ...
[14:01] <alphe> so how can I make the keys match
[14:02] <alphe> is there a way to repair / reiniciate the osd in order to bring it back in the ceph cluster ?
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[14:04] <alphe> guess this is a tough ask that has no known answer
[14:07] <alphe> could ceph-osd --mkfs --mkkey --cluster=ceph -i 4 could work ?
[14:07] <alphe> in order to reset the osd and its key ?
[14:11] <alphe> Error EINVAL: entity osd.4 exists but key does not match
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[14:24] <alphe> by mistake I started erasing the disk of one of my osd anyone can help me with bringing back that osd in the pool with it s original number ?
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[14:38] <pmatulis> alphe: what were the exact commands you used to remove it?
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[14:52] <alphe> pmatulis
[14:52] <alphe> ceph osd rm osd.4
[14:52] <alphe> ceph osd crushmap rm osd.4
[14:53] <alphe> but then I figured out alone that I need to ceph auth del osd.4
[14:53] <alphe> then I do the ceph-deploy disk zap node:disk
[14:53] <alphe> then I do the ceph-deploy disk prepare node:disk
[14:54] <alphe> then I do ceph-deploy osd activate node:diskPart1
[14:54] <alphe> and everything works like a charm
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[14:55] <alphe> I remove the osd from osdmap osdcrushmap authmap and then I zap the drive and recreate it from scratch as the osd number id is missing then ceph-deploy will take that missing id and create the disks id auth keys etc as a brand new normal
[14:56] <alphe> it is usefull if simply you get a dead drive and want to replace your osd drive without messing up your osd count or your osd tree
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[14:57] <alphe> easy to admin if you have on node1 osd.0 osd.1 node2 osd.2 osd.3 etc...
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[14:57] <alphe> than if you have node1 osd.0 osd10 node2 osd.50 osd.2
[14:57] <alphe> ...
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[15:04] <pmatulis> alphe: i don't understand. you said you got an error before (fails with the osd exists but the key doesn t match) and now you seem to say everything works except you don't like the assigned osd IDs
[15:05] <alphe> hum ... nope
[15:06] <alphe> the error was that the ceph authmap has the record of the previous osd
[15:06] <alphe> i deleted that record
[15:06] <alphe> and bing it worked fine
[15:06] <pmatulis> ok, that's what i thought
[15:06] <alphe> I had to recreate the journal too
[15:06] <pmatulis> naturally
[15:07] <pmatulis> so what's wrong?
[15:07] <alphe> it is interresting to know how to do that because if you crash a drive of one of your osd and you want to replace it using the same id you need to do that
[15:07] <alphe> pmatulis normally now there is nothing wrong since I figured out my way out
[15:08] <pmatulis> alphe: yes, it would be interesting to be able to use the old ID
[15:09] <alphe> I didnt launched the osd with old id yet because my ceph cluster is in production and I dont want to kill my ceph cluster
[15:09] <alphe> with restart
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[15:32] <pmatulis> the old id? i thought you got a new id?
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[15:43] <JoeHazzers> I'm trying to deploy an osd using "ceph-deploy osd prepare hostname:sdc:/dev/sdb1" but I get the error "Device is in use by a device-mapper mapping". There's no mounts on this device. What's going on?
[15:43] <fghaas> JoeHazzers: the error message is rather plain and simple :)
[15:44] <fghaas> "dmsetup ls" and/or "dmsetup table" are your friends
[15:45] <JoeHazzers> Thanks, it turns out it's lingering in an old raid partition ;)
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[15:47] <fghaas> you used dm-raid at some point? wow, first time I've heard that in years
[15:48] <JoeHazzers> I didn't the previous user of the machine did
[15:48] <JoeHazzers> and of course, only the two first drives were wiped for reinstall
[15:48] <JoeHazzers> and there was lingering stuff on the other disks
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[15:51] <alphe> pmatulis one ask when you add an empty drive to an existing ceph cluster (with a running existing and sane rbd ) how can i force the new empty drive to get data
[15:52] <alphe> better said how can i make the other osd to give that new empty drive their amount of data in excess ?
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[15:58] <mattch> alphe: It will just happen :) (what exactly happens depends on the crush map of course...)
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[16:01] <alphe> yeah ...
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[16:01] <alphe> well default crushmap with default crushrule
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[17:36] <dwm> Hmm, I think I might have found a defect with the Ceph udev rules.
[17:36] <dwm> (This also appears to exist in the upstream udev rules.)
[17:36] <dwm> Specifically: by-partuuid symlinks aren't created for MD partitions.
[17:37] <dwm> ... which means that when I just tried to install my OSD journals on a pair of striped OSDs, they couldn't be found!
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[17:39] <dwm> This is because md devices are being explicitly skipped. (As are devices beginning fd*, mtd*, nbd*, dm-*.)
[17:40] <dwm> Removing md* from this list of exceptions causes things to work; I'm not sure what negative consequences this might have..
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[18:45] <ron-slc> is there any type of librbd read-ahead setting? If librbd is able to detect a lot of sequential data requests, it could be pro-active, and prefetch upcoming blocks?
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[18:49] <fghaas> ron-slc: yup, thereis
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[18:51] <fghaas> at least I think I remember something like that
[18:53] <fghaas> oh wait, this could be supported by krbd only and not exposed in the library
[18:53] <ron-slc> Interesting!. This would be huge for KVM guests, if it was made available in librbd
[18:54] <joshd> librbd doesn't do any readahead, although it could help some workloads
[18:54] <fghaas> joshd, but it is supported in krbd, do I remember that correctly?
[18:54] <joshd> the guest itself is often doing readahead already, but doing it in object-size chunks would be better
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[18:55] <ron-slc> yea would be nice if sequential requests are coming in, start to prefetch the next 4(more?) chunks
[18:55] <joshd> fghaas: it's handled by higher levels, so it works fine with krbd
[18:56] <fghaas> joshd, gotcha, thanks
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[18:57] <ron-slc> It would be wasteful, and probably performance hindrance to random reads, for librbd to prefetch; so some logic would be required. I'd think.
[18:57] <joshd> yeah
[18:58] <joshd> ceph-fuse has does some readahead using the same caching infrastructure as librbd
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[18:58] <ron-slc> yea, I've tinkered with it a little. But it's not as squeaky of a wheel.
[18:58] <joshd> certainly worth exploring
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[18:59] <fghaas> dmick: per our conversation yesterday, I've created issue #7282 (added you, joshd and wido as watchers)
[18:59] <kraken> fghaas might be talking about http://tracker.ceph.com/issues/7282 [Unresponsive rbd-backed Qemu domain causes libvirtd to stall on all connections]
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[19:00] <fghaas> ugh, I mixed up a bullet list in that issue. does redmine have no way to edit the original description?
[19:00] <joshd> ron-slc: the giant cds is coming up in fairly soon. maybe you'd like to add a small blueprint for readahead?
[19:01] <joshd> fghaas: hit update, then the pencil icon next to the description field
[19:02] <fghaas> joshd, ah thanks, that's somewhat hidden :)
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[19:02] <ron-slc> joshd: I'll look into this!
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[19:03] <joshd> ron-slc: thanks! http://wiki.ceph.com/Planning/Blueprints
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[19:16] <poelzi> may some of the core devs please have a look at http://tracker.ceph.com/issues/6101
[19:17] <poelzi> if you need more information about this bug, i need this info asap, because when the error is gone by deleting the rdb, i may not be able to provide more informations
[19:18] <mikedawson> fghaas: When you hit #7282 does the host CPU spin out of control, with loads like 120, 115, 110 or similar?
[19:19] <fghaas> mikedawson: not that I would have noticed, but I must confess I didn't check for loadavg specifically and it was on a 48-core box, so it not something one would notice by an unresponsive session
[19:20] <fghaas> if it did, would you say it would indicate libvirtd spinning, or an rbd process being stuck in the D state, or both?
[19:20] <mikedawson> fghass, we've had a recurring issue where the client network drops and can't renew dhcp. Host CPU is totally hosed, libvirt is unresponsive, can't kill qemu, have to hard reset the host
[19:23] <fghaas> er, no. as the issue description explains, this happened right after pulling in an rbd pool into libvirt, reliably. that part isn't hard to reproduce. the hard part is getting the ceph cluster in a state that would trigger the problem
[19:25] <mikedawson> fghaas: perhaps it is a different issue. We get ours without the need to migrate rbd volumes. Seemingly random in timing (except for it typically happens when I'm asleep or otherwise not ready to respond!)
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[19:25] <fghaas> I was able to fire up 100 non-rbd vms in that cluster and concurrently destroy them, no problem
[19:26] <fghaas> add rbd and some of them will blow up
[19:26] <fghaas> not all, mind you
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[19:28] <fghaas> now if I could look at, say, an unfound object in the cluster and were able to map it to an rbd volume, I could just fire up a domain backed by that, and would have reliable way to reproduce
[19:28] <JeffK> Hmm, the block device quick start page says "do not execute the following procedures on the same physical node as your Ceph Storage Cluster nodes." I was under the impression that you could mount the block device on the same servers that host OSDs. Is this not the case?
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[19:29] <fghaas> JeffK: same problem as with loopback mounted iscsi or nfs
[19:29] <fghaas> kernel deadlock issues
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[19:30] <fghaas> I've explained the problem years ago for drbd and loop devices (http://lists.linbit.com/pipermail/drbd-user/2011-May/016009.html), for anything network based, just map "filesystem" to "network buffer"
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[19:50] <JeffK> So, is it not possible to host VMs that are stored in Ceph on the same machines that house the OSDs?
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[19:52] <Sysadmin88> proxmox has a video doing that
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[19:56] <fghaas> JeffK: of course it is, because VMs don't use kernel RBDs
[19:56] <fghaas> this limitation doesn't apply to the userspace librbd implementation that the qemu rbd storage driver uses
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[19:59] <JeffK> Oh, ok, awesome. Thanks!
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[20:03] <fghaas> and jftr, I don't know what exactly proxmox uses, but if they use anything involving userspace RBD, they should be fine
[20:03] <fghaas> and if they use kernel RBD, they should be fined ;)
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[21:21] <nwat> When creating a new pool and settings it's pg count, I'm getting this error `Error E2BIG: specified pg_num 400 is too large (creating 392 new PGs on ~8 OSDs exceeds per-OSD max of32)`. I'm not really sure what this means, since it appears I can actually create 400, I just have to do it in smaller increments.
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[22:09] <dmick> nwat: there was a "too many at one chunk" throttle added recently because you can bury a cluster by expanding too fast
[22:10] <dwm> Yeah, I discovered that earlier today. :D
[22:10] <nwat> dmick: oh ok perfect. the error message didn't help much
[22:11] <dmick> it could be slightly better worded
[22:13] <nwat> can it just print out "[13:09:25] <dmick> nwat: there was a "too many at one chunk" throttle added recently because you can bury a cluster by expanding too fast"
[22:22] <pmatulis> nwat: open a bug
[22:23] <pmatulis> http://tracker.ceph.com/projects/ceph/issues
[22:24] <nwat> pmatulis: thanks, yeh i was joking about the message but i suppose i should open a ticket. i wish @kraken could do that for me
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[22:28] <pmatulis> not sure how that can be
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[22:35] <dmick> pmatulis: you're just not thinking big enough. Obviously, first we write a IRC-to-Twitter gateway. Then, we glue the Twitter page together with Tracker using the latest JavaScript-Java glue technology, with a mongodb backend (because it's webscale). I'll leave the rest to you.
[22:36] <nwat> webscale lol
[22:36] <pmatulis> dmick: ha ha, that's a great way to finish the week, thank you
[22:38] <dmick> ;)
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[23:24] <alphe> hello I m not out of my misery yet
[23:24] <alphe> here is what happend
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[23:24] <alphe> I have a node with a dual core atom and 2 disks and 2 osd
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[23:25] <alphe> when I try to put back both osd in the tracks I get the osd cpu overloading and the node crash
[23:25] <alphe> so how can I limit osd cpu use ?
[23:26] <alphe> because sooner or later I will have to get the second osd back in the ceph cluster and that will overflow my cpu again and crash it
[23:27] <alphe> one of the os is eating up 79% of mem too
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[23:59] <alphe> I wonder how can I make my recovry process not so heavy in terms of cpu load and memory use
[23:59] <alphe> somewhat slower whould be great tooo

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