Re: krbd & live resize

[Loic Dachary <loic@dachary.org>]

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Hi Laurent,

Your patch can be applied to 3.8 as described here:

http://dachary.org/?p=2179

Thanks again

On 30/07/2013 12:07, Laurent Barbe wrote:
> 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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>>

-- 
Loïc Dachary, Artisan Logiciel Libre
All that is necessary for the triumph of evil is that good people do nothing.


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