Re: krbd & live resize

[Laurent Barbe <laurent@ksperis.com>]

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
>>>
>> --
>> To unsubscribe from this list: send the line "unsubscribe ceph-devel" in
>> the body of a message to majordomo@vger.kernel.org
>> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>
--
To unsubscribe from this list: send the line "unsubscribe ceph-devel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html