#ceph IRC Log

Index

IRC Log for 2013-04-14

Timestamps are in GMT/BST.

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[0:34] <mrjack> what can i do when my monitors are fighting each other?
[0:35] <joao> define 'fighting'
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[0:39] <mrjack> there are elections every 10 - 15 sec
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[0:40] <joao> that can be an overloaded monitor lagging behind
[0:40] <mrjack> one laggy monitor can cause this?
[0:40] <joao> 'ceph health detail' should tell you if you're experiencing latency in the cluster
[0:40] <joao> it can
[0:41] <joao> depending on the lag
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[0:41] <mrjack> HEALTH_WARN 1 mons down, quorum 0,1,2,4 0,1,2,4
[0:41] <mrjack> mon.3 (rank 3) addr 188.65.144.7:6789/0 is down (out of quorum)
[0:42] <mrjack> it seems it interrupts io shortly if one monitor is down?
[0:42] <joao> well, I can't help you debug this tonight -- have to wake up way too early tomorrow -- but am happy to point you in the right direction, and maybe you could send an email to the list with whatever you may find out
[0:44] <joao> basically, setting up 'debug mon = 20', 'debug paxos = 20' and 'debug ms = 1' and then grep the log for 'timeout' should provide some more insight on what's timing out
[0:44] <mrjack> the node is doing raid1 rebuild.. i stopped the monitor and now the elections are gone
[0:44] <joao> furthermore, 'ceph health detail --format=json' should output extra info on timechecks (both with clock skews and latency)
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[0:45] <mrjack> is the monitor so io-intense?
[0:47] <joao> shouldn't be intense, but if the monitor is synchronizing the store, recovering or converting the store, it may take a while
[0:47] <joao> those are mainly io-bound behaviors
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[1:20] <nigwil> anyone here using OpenStack with Ceph?
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[2:03] <Kdecherf> joao: we upgraded our cluster today from 0.56.1 to 0.60 in emergency 'cause of strange segfault on the mds
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[2:04] <Kdecherf> joao: and we found #4521 and #4624
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[11:46] <humbolt> I want to put the SSDs in my servers and the HDDs in different roots, so I can make CRUSH rulesets exclusively use the one or the other.
[11:47] <humbolt> From what I saw in the documentation, I would have to treat my server, as if it was two, assigning two hostnames to it in my hosts file and having two separate host entries in CRUSH and ceph.conf.
[11:47] <humbolt> Is there another way?
[11:49] <humbolt> And has anybody seen that one before? lobal_init: unable to open config file from search list /tmp/ceph.conf.f5cfbe120e20fdad74b65d39f0abe2e6
[11:49] <humbolt> failed: 'ssh paris5.san ulimit -n 8192; /usr/bin/ceph-osd -i 2 --pid-file /var/run/ceph/osd.2.pid -c /tmp/ceph.conf.f5cfbe120e20fdad74b65d39f0abe2e6 '
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[14:35] <humbolt> pg_num 256 pgp_num 256, that is something I have not completely understood yet
[14:36] <humbolt> I know, what PGs are for, but how to figure out, how many I want for my pool, I don't know
[14:36] <humbolt> and the difference between pg_num and pgp_num, is a mystery to me
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[20:30] <mrjack> i know it may be OT, but has anyone an idea why qemu stuck at 100%cpu load after migrating and virsh showing the vm as paused but resume does not work and the vm is stuck?
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[22:25] <mrjack> anyone got an idea why i see these slow datarates every 5 sec?
[22:25] <mrjack> http://office.smart-weblications.net/winbench.png
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[22:54] <perabgd> hello
[22:55] <perabgd> quick question, hope you guys know answer :)
[22:55] <perabgd> can't start osd's
[22:55] <perabgd> get error: ** ERROR: unable to open OSD superblock
[22:55] <perabgd> any hints?
[22:55] <perabgd> running 0.56.4-1quantal on ubuntu 12.10
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[23:04] <perabgd> anyone? :(
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[23:14] <mrjack> sorry
[23:14] <mrjack> no idea
[23:14] <mrjack> what fs are you using?
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[23:16] <perabgd> hey hi
[23:16] <perabgd> :) mrjack
[23:17] <perabgd> i tried xfs and now trying with ext4
[23:17] <perabgd> not working :(
[23:18] <perabgd> now with ext4 i get
[23:18] <perabgd> /usr/bin/monmaptool: writing epoch 0 to /tmp/mkcephfs.oeA5e4N9t1/monmap (1 monitors)
[23:18] <perabgd> === osd.0 ===
[23:18] <perabgd> umount: /srv/ceph/osd.0: not mounted
[23:18] <perabgd> umount: /dev/mapper/ceph1-ctrl: not mounted
[23:18] <perabgd> mke2fs 1.42.5 (29-Jul-2012)
[23:18] <perabgd> mkfs.ext4: invalid blocks '/dev/mapper/ceph1-ctrl' on device 'user_xattr,rw,noatime'
[23:18] <perabgd> failed: '/sbin/mkcephfs -d /tmp/mkcephfs.oeA5e4N9t1 --prepare-osdfs osd.0'
[23:19] <perabgd> but mkfs goes ok
[23:19] <perabgd> ---
[23:19] <perabgd> mkfs.ext4 /dev/mapper/ceph1-ctrl
[23:19] <perabgd> mke2fs 1.42.5 (29-Jul-2012)
[23:19] <perabgd> Filesystem label=
[23:19] <perabgd> OS type: Linux
[23:19] <perabgd> Block size=4096 (log=2)
[23:19] <perabgd> Fragment size=4096 (log=2)
[23:19] <perabgd> Stride=0 blocks, Stripe width=0 blocks
[23:19] <perabgd> 3276800 inodes, 13107200 blocks
[23:19] <perabgd> 655360 blocks (5.00%) reserved for the super user
[23:19] <perabgd> First data block=0
[23:19] <perabgd> Maximum filesystem blocks=4294967296
[23:19] <perabgd> 400 block groups
[23:19] <perabgd> 32768 blocks per group, 32768 fragments per group
[23:19] <perabgd> 8192 inodes per group
[23:19] <perabgd> Superblock backups stored on blocks:
[23:19] <mrjack> 'user_xattr,rw,noatime'
[23:19] <perabgd> 32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
[23:19] <perabgd> 4096000, 7962624, 11239424
[23:19] <perabgd> Allocating group tables: done
[23:19] <mrjack> is no valid parameter for mkfs
[23:19] <perabgd> Writing inode tables: done
[23:19] <perabgd> Creating journal (32768 blocks): done
[23:19] <perabgd> Writing superblocks and filesystem accounting information: done
[23:19] <perabgd> i'm using LVM and lv for ceph storage
[23:19] <mrjack> these are mount options and only used when mounting
[23:19] <perabgd> # EXT4
[23:19] <perabgd> osd mkfs type = ext4
[23:19] <mrjack> user_xattr is not needed by xfs
[23:19] <perabgd> osd mkfs options ext4 = user_xattr,rw,noatime
[23:19] <perabgd> filestore xattr use omap = true
[23:19] <perabgd> yeah those are used on ceph.conf
[23:20] <perabgd> i'm trying now with ext4
[23:20] <mrjack> osd mkfs options just leave empt
[23:20] <mrjack> empty
[23:20] <perabgd> k sec
[23:21] <nigwil> for my curiosity, why do you prefer ext4 over xfs?
[23:21] <mrjack> good point ;)
[23:21] <perabgd> i like xfs more than ext4
[23:22] <perabgd> just trying this to work
[23:22] <perabgd> tried with xfs from start
[23:22] <perabgd> didn't work out
[23:22] <mrjack> you do not have to set options there
[23:22] <perabgd> yeah got these now
[23:22] <perabgd> 2013-04-14 23:20:55.598945 7f06ca182780 -1 filestore(/srv/ceph/osd.0) limited size xattrs -- filestore_xattr_use_omap enabled
[23:22] <perabgd> 2013-04-14 23:20:55.774449 7f06ca182780 -1 filestore(/srv/ceph/osd.0) could not find 23c2fcde/osd_superblock/0//-1 in index: (2) No such file or directory
[23:22] <perabgd> 2013-04-14 23:20:56.146576 7f06ca182780 -1 created object store /srv/ceph/osd.0 journal /srv/ceph/osd.0/journal for osd.0 fsid 29974ff5-76e1-494a-b727-37d6724c3de9
[23:22] <mrjack> mount options goes to fstab
[23:22] <perabgd> 2013-04-14 23:20:56.146819 7f06ca182780 -1 already have key in keyring /etc/ceph/keyring.osd.0
[23:23] <nigwil> "didn't work out", you are seeing errors using XFS?
[23:23] <mrjack> is it mounted? /srv/ceph/osd.0 ?
[23:23] <perabgd> ok let me start from the begining
[23:23] <perabgd> i have tried with xfs but i didn't manage to make it work
[23:23] <perabgd> these are options from ceph.conf
[23:23] <perabgd> that i was using
[23:24] <perabgd> # XFS
[23:24] <perabgd> #osd mkfs type = xfs
[23:24] <perabgd> #osd mkfs options xfs = "-f" # default for xfs is "-f"
[23:24] <perabgd> #osd mount options xfs = "rw,noatime,barrier=0" # default mount option is "rw,noatime"
[23:24] <mrjack> please use pastebin
[23:25] <mrjack> mkfs.xfs does not take -f as argument if i read the help correctly
[23:25] <perabgd> if you use mkfs.xfs on system that had/has already xfs
[23:25] <perabgd> you need to use -f flag (force)
[23:25] <perabgd> to re-format it again
[23:26] <mrjack> what error did you get?
[23:26] <nigwil> it might help to know what distro you are using too
[23:27] <perabgd> Starting Ceph osd.0 on ctrl...
[23:27] <perabgd> 2013-04-14 22:44:11.545304 7f59ffefe780 -1 ** ERROR: unable to open OSD superblock on /srv/ceph/osd.0: (2) No such file or directory
[23:27] <perabgd> failed: 'ulimit -n 8192; /usr/bin/ceph-osd -i 0 --pid-file /var/run/ceph/osd.0.pid -c /etc/ceph/ceph.conf '
[23:27] <perabgd> ubuntu 12.10
[23:27] <mrjack> again
[23:27] <perabgd> ceph: Version: 0.56.4-1quantal
[23:27] <mrjack> is /srv/ceph/osd.0 mountd?
[23:28] <perabgd> # mount | grep ceph
[23:28] <perabgd> /dev/mapper/ceph1-ctrl on /srv/ceph/osd.0 type ext4 (rw,noatime)
[23:28] <mrjack> please paste somehwere content of ceph.conf and mount output
[23:28] <perabgd> sec
[23:28] <nigwil> that error about superblock has appeared before: http://tracker.ceph.com/issues/2618
[23:29] <mrjack> is /srv/ceph/osd.0 empty? e.g. no filestore setup?
[23:30] <perabgd> http://pastebin.com/Ra4A6vni
[23:30] <perabgd> yeah seen that one from google search
[23:31] <perabgd> http://pastebin.com/v24emGz4
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[23:43] <perabgd> ok guys, thanks anyway
[23:43] <perabgd> bye
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