The immediate cause of the problem is that the osd's "commit_op_seq"
file is reading back '0',
which is invalid; it's created with an initial value of 1. Try removing
the osd data dir
(/var/lib/ceph/osd/ceph-0) completely and let it be recreated; perhaps
something got there somehow by mistake.
If the error persists you can look more deeply.
On 10/14/2012 12:50 AM, Adam Nielsen wrote:
Hi all,
I'm attempting to set up a Ceph cluster for testing, initially with
only one node so I can add others next. I think I've followed the
guides as closely as I could, but now when running mkcephfs it fails
and I can't find much about the error through Google.
What am I doing wrong? This is on Debian Squeeze with the stable repo
from ceph.com.
$ mkcephfs -a -c /etc/ceph/ceph.conf
temp dir is /tmp/mkcephfs.FqyH7RCFY1
preparing monmap in /tmp/mkcephfs.FqyH7RCFY1/monmap
/usr/bin/monmaptool --create --clobber --add 0 192.168.0.6:6789
--print /tmp/mkcephfs.FqyH7RCFY1/monmap
/usr/bin/monmaptool: monmap file /tmp/mkcephfs.FqyH7RCFY1/monmap
/usr/bin/monmaptool: generated fsid 77b0e551-b545-42df-957e-b99292539501
epoch 0
fsid 77b0e551-b545-42df-957e-b99292539501
last_changed 2012-10-14 17:40:11.128447
created 2012-10-14 17:40:11.128447
0: 192.168.0.6:6789/0 mon.0
/usr/bin/monmaptool: writing epoch 0 to
/tmp/mkcephfs.FqyH7RCFY1/monmap (1 monitors)
=== osd.0 ===
** WARNING: 'filestore btrfs snap' is enabled (for safe transactions,
rollback), but btrfs does not support the SNAP_CREATE_V2
ioctl
(added in Linux 2.6.37). Expect slow btrfs sync/commit
performance.
2012-10-14 17:40:12.768973 b732b710 -1
filestore(/var/lib/ceph/osd/ceph-0) mount initial op seq is 0;
something is wrong
2012-10-14 17:40:12.769238 b732b710 -1 OSD::mkfs: couldn't mount
FileStore: error -22
2012-10-14 17:40:12.769522 b732b710 -1 ** ERROR: error creating empty
object store in /var/lib/ceph/osd/ceph-0: (22) Invalid argument
failed: '/sbin/mkcephfs -d /tmp/mkcephfs.FqyH7RCFY1 --init-daemon osd.0'
$ cat /etc/ceph/ceph.conf
[osd]
osd journal size = 10000
[mon.0]
host = node1
mon addr = 192.168.0.6:6789
mon data = /var/lib/ceph/osd/$cluster-$id/
[osd.0]
host = node1
[mds.0]
host = node1
Any suggestions? I tried commenting out "mon data" but it didn't make
a difference (and I need this in because the test machine's root
filesystem is on a 4GB CF card, so I need all non-OS data to be stored
on the disks assigned to Ceph.)
Thanks,
Adam.
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