Re: [Xen-devel][PATCH]: Support dynamic resizing of vbds

["Ky Srinivasan" <ksrinivasan@xxxxxxxxxx>]

>>> On 3/14/2010 at 10:06 AM, in message <20100314140647.GJ1878@xxxxxxxxxxx>, 
>>> Pasi
KÃrkkÃinen<pasik@xxxxxx> wrote: 
> On Sun, Mar 14, 2010 at 01:49:38PM +0000, Andrew Lyon wrote:
>> On Fri, Mar 12, 2010 at 10:41 AM, J. Roeleveld <joost@xxxxxxxxxxxx> wrote:
>> > On Tuesday 09 March 2010 20:56:11 Ky Srinivasan wrote:
>> >> The attached patch supports dynamic resizing of vbds.
>> >>
>> >> Signed-off-by: K. Y. Srinivasan <ksrinivasan@xxxxxxxxxx>
>> >>
>> >
>> > Thank you for this.
>> >
>> > The patch applied succesfully against the gentoo-xen kernel (2.6.29-xen-r4)
>> >
>> > I will test the patch on my system during the next week and provide 
> feedback.
>> >
>> > --
>> > Joost Roeleveld
>> >
>> > _______________________________________________
>> > Xen-devel mailing list
>> > Xen-devel@xxxxxxxxxxxxxxxxxxx
>> > http://lists.xensource.com/xen-devel
>> >
>> 
>> I tested the patch on xen-sources-2.6.31-r12 and it appears to work 
>> perfectly:
>> 
>> dom0: VBD Resize: new size 172032
>> domU: Setting capacity to 172032
>>
> 
> Btw it would be good to add the vbd-device and domU name to these log entries 
> in the dom0,
> and the device name in domU!

Agreed. Will send out the patch soon.

K. Y
>  
>> I extended the filesystem and filled up the available space, then
>> extended again:
>> 
>> dom0: VBD Resize: new size 376832
>> domU: Setting capacity to 376832
>> 
>> fsck, badblocks, and testing a tarball I had filled the filesystem
>> with revealed no problems, so I decided to try reducing the
>> filesystem, first using resize2fs, then reducing the size of the block
>> device, although some errors were logged in domU the operation seemed
>> to work ok:
>> 
>> dom0: VBD Resize: new size 114688
>> domU: Setting capacity to 114688
>> domU: end_request: I/O error, dev sdb1, sector 212984
>> domU: Buffer I/O error on device sdb1, logical block 26623
>> 
>> I did notice that it seemed to be necessary to "poke" the device using
>> cfdisk /dev/sdb1 before domU would notice the new size, but on the
>> whole everything works nicely and this is a very useful new feature!
>> 
> 
> Good to hear it works!
> 
> -- Pasi


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