On 07/20/2013 05:16 PM, Sage Weil wrote:
On Sat, 20 Jul 2013, Wido den Hollander wrote:
On 07/20/2013 06:56 AM, Jeffrey 'jf' Lim wrote:
On Fri, Jul 19, 2013 at 12:54 PM, Jeffrey 'jf' Lim <jfs.world@xxxxxxxxx>
wrote:
hey folks, I was hoping to be able to use xfs on top of RBD for a
deployment of mine. And was hoping for the resize of the RBD
(expansion, actually, would be my use case) in the future to be as
simple as a "resize on the fly", followed by an 'xfs_growfs'.'
I just found a recent post, though
(http://lists.ceph.com/pipermail/ceph-users-ceph.com/2013-June/002425.html),
that seems to indicate that what I have in mind may not be possible?
is this true? Do I have to unmount the system (or worse, do a reboot?)
before I can do an effective resize?
another question that just came to mind: would you recommend skipping
partitioning, and then making an xfs out of the entire drive? I'm just
thinking how you would have to deal with partitioning upon an RBD
resize.
Yes, skip the partitioning, otherwise you will have to expand the partition
first prior to expanding the filesystem.
I also just did a quick test with the 3.8 kernel and XFS directly on top of
the RBD device, but the new size won't get detected while XFS is mounted.
Hrm. Do you know if this works with LVM?
I verified again with the 3.8 kernel in Ubuntu 12.04
(linux-image-generic-lts-raring) and with XFS this works:
$ rbd create --size 20480 image1
$ rbd map image1
$ mkfs.xfs /dev/rbd/rbd/image1
$ mkdir /tmp/rbd1
$ mount -o rw,noatime /dev/rbd/rbd/image1 /tmp/rbd1
$ rbd resize --size 40960 image1
$ umount /tmp/rbd1
$ mount -o rw,noatime /dev/rbd/rbd/image1 /tmp/rbd1
$ xfs_growfs /tmp/rbd1
I couldn't get LVM to work though, pvcreate kept failing with:
"#filters/filter.c:134 /dev/rbd2: Skipping: Unrecognised LVM device type
250"
That is usually due to a filter in /etc/lvm/lvm.conf, but that is set to:
# By default we accept every block device:
filter = [ "a/.*/" ]
So I'm not sure why pvcreate fails to use that RBD device for LVM.
Wido
sage
--
Wido den Hollander
42on B.V.
Phone: +31 (0)20 700 9902
Skype: contact42on
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