Hi Jim,
I think you're right. Commit ad12d5d5be41ce fixed a bug for users
creating a journal that resided in a regular file, but introduced an
inconvenience for users who put the journal on a raw block device. If
no size is specified, but a raw block device is given as an argument,
we should discover the size of the raw block device and set the
journal size appropriately.
cheers,
Colin
On Wed, Oct 20, 2010 at 8:08 AM, Jim Schutt <jaschut@xxxxxxxxxx> wrote:
>
> Hi,
>
> Current testing head mkcephfs fails when trying to create
> a file system with an osd journal on a partition, rather than
> a file, when the journal size is not specified. It fails like
> this:
>
> === osd.0 ===
> scp: /etc/ceph/ceph.conf: Read-only file system
> /usr/bin/cconf -c /etc/ceph/ceph.conf -i 0 -t osd "osd data" ""
> /usr/bin/cconf -c /etc/ceph/ceph.conf -i 0 -t osd "osd journal" ""
> /usr/bin/cconf -c /etc/ceph/ceph.conf -i 0 -t osd "keyring" ""
> /usr/bin/cconf -c /etc/ceph/ceph.conf -i 0 -t osd "btrfs path" "/ram/mnt/ceph/disk.00p2"
> /usr/bin/cconf -c /etc/ceph/ceph.conf -i 0 -t osd "btrfs devs" ""
> /usr/bin/cconf -c /etc/ceph/ceph.conf -i 0 -t osd "btrfs options" "noatime"
> --- ssh an1 "cd /root ; ulimit -c unlimited ; test -d /ram/mnt/ceph/disk.00p2 || mkdir -p /ram/mnt/ceph/disk.00p2"
> Warning: Permanently added 'an1,172.17.0.21' (RSA) to the list of known hosts.
> --- ssh an1 "cd /root ; ulimit -c unlimited ; test -d /dev/disk/by-path/fc-0:0:00:00p1 || mkdir -p /dev/disk/by-path"
> Warning: Permanently added 'an1,172.17.0.21' (RSA) to the list of known hosts.
> Warning: Permanently added 'an1,172.17.0.21' (RSA) to the list of known hosts.
> monmap.17120 100% 183 0.2KB/s 00:00
> --- ssh an1 "cd /root ; ulimit -c unlimited ; /usr/bin/cosd -c /etc/ceph/ceph.conf --monmap /tmp/monmap.17120 -i 0 --mkfs --osd-data /ram/mnt/ceph/disk.00p2"
> Warning: Permanently added 'an1,172.17.0.21' (RSA) to the list of known hosts.
> ** WARNING: Ceph is still under heavy development, and is only suitable for **
> ** testing and review. Do not trust it with important data. **
> ** ERROR: error creating empty object store in /ram/mnt/ceph/disk.00p2: Invalid argument
> failed: 'ssh an1 /usr/bin/cosd -c /etc/ceph/ceph.conf --monmap /tmp/monmap.17120 -i 0 --mkfs --osd-data /ram/mnt/ceph/disk.00p2'
>
>
> The osd.0 part of my ceph.conf looks like this:
>
> ; osd daemon common options:
> [osd]
> keyring = /ceph/osd/keyring.$name
> osd client message size cap = 67108864
> debug osd = 5
>
> ; osd daemon options per instance:
> [osd0]
> host = an1
> osd addr = 172.17.40.21
> osd journal = /dev/disk/by-path/fc-0:0:00:00p1
> btrfs devs = /dev/disk/by-path/fc-0:0:00:00p2
> osd data = /ram/mnt/ceph/disk.00p2
> # Do not attempt btrfs mount until udev link shows up,
> # and make sure mount point exists.
> pre mount command = "until [ -L /dev/disk/by-path/fc-0:0:00:00p2 ]; do sleep 1; done && { [ -d /mnt/ceph/disk.00p2 ] || mkdir /mnt/ceph/disk.00p2; }"
>
>
> Adding "osd journal size = 104857600" to my ceph.conf
> allows mkcephfs to succeed.
>
> Alternatively, reverting commit ad12d5d5be41ce allows mkcephfs to
> succeed without specifying the journal size.
>
> Was this change of behavior an intentional part of the
> bugfix, or am I doing something wrong?
>
> Would it be possible to discover when the journal is a
> partition, and if so query its size?
>
> Thanks -- Jim
>
>
>
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