Live resize has been added in 3.6.10 for krbd client.
There is a need to do revalidate_disk() on rbd resize :
https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/?id=d98df63ea7e87d5df4dce0cece0210e2a777ac00
Cheers
Laurent
Le 30/07/2013 11:57, Loic Dachary a écrit :
On 30/07/2013 11:55, Laurent Barbe wrote:
Hello Loic,
which version of kernel do you use for krbd ?
Linux i-csnces-0000 3.2.0-41-generic #66-Ubuntu SMP
That may explain a few things ... :-)
Laurent
Le 29/07/2013 23:50, Loic Dachary a écrit :
Hi,
This works:
lvcreate --name tmp --size 10G all
Logical volume "tmp" created
mkfs.ext4 /dev/all/tmp
mount /dev/all/tmp /mnt
blockdev --getsize64 /dev/all/tmp
10737418240
lvextend -L+1G /dev/all/tmp
Extending logical volume tmp to 11,00 GiB
Logical volume tmp successfully resized
blockdev --getsize64 /dev/all/tmp
11811160064
resize2fs /dev/all/tmp
resize2fs 1.41.12 (17-May-2010)
Filesystem at /dev/all/tmp is mounted on /mnt; on-line resizing required
old desc_blocks = 1, new_desc_blocks = 1
Performing an on-line resize of /dev/all/tmp to 2883584 (4k) blocks.
The filesystem on /dev/all/tmp is now 2883584 blocks long.
This does not work:
rbd create --size 10240 tmp
rbd info tmp
rbd image 'tmp':
size 10240 MB in 2560 objects
order 22 (4096 KB objects)
block_name_prefix: rb.0.12dd.238e1f29
format: 1
rbd map tmp
mkfs.ext4 /dev/rbd1
mount /dev/rbd1 /mnt
blockdev --getsize64 /dev/rbd1
10737418240
rbd resize --size 20000 tmp
blockdev --getsize64 /dev/rbd1
10737418240
resize2fs /dev/rbd1
resize2fs 1.42 (29-Nov-2011)
The filesystem is already 2621440 blocks long. Nothing to do!
It does work after umounting:
umount /mnt
blockdev --getsize64 /dev/rbd1
fsck -f /dev/rbd1
resize2fs /dev/rbd1
resize2fs 1.42 (29-Nov-2011)
Resizing the filesystem on /dev/rbd1 to 5120000 (4k) blocks.
The filesystem on /dev/rbd1 is now 5120000 blocks long.
I assume there should be "something" in KRBD to allow for the same behavior as with LVM but I don't know enough about the kernel to be more specific. Maybe something similar to ioctl BLKRRPART ?
Cheers
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