Re: [Xen-devel] Resizing block devices live?

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Tue, Dec 18, 2012 at 02:06:56PM +0000, George Dunlap wrote:
>    On Tue, Dec 18, 2012 at 1:58 PM, Ian Campbell <[1]Ian.Campbell@xxxxxxxxxx>
>    wrote:
> 
>      On Tue, 2012-12-18 at 13:52 +0000, George Dunlap wrote:
>      > One of the requests from the [2]xenorg.uservoice.com page that had a
>      > moderate amount of interest was to allow block devices to be resized.
>      > There's a description here:
>      >
>      >
>      
> [3]https://xenorg.uservoice.com/forums/172169-xen-development/suggestions/3140313-implement-block-device-resize
>      >
>      >
>      > I have no idea what this would take -- can anyone comment?
> 
>      Doesn't that already work? I thought this was patch in the PV block
>      drivers ages ago...
> 
>      Yes, [4]http://wiki.xen.org/wiki/XenParavirtOps lists it under 2.6.36.
> 
>      Maybe this is a missing feature of (lib)xl vs xend?
> 
>    "xm help" doesn't show a "block-resize" command, nor does grepping through
>    tools for "resize" turn up anything.
> 
>    Would someone be willing to do some investigation into whether such a
>    command is implemented in the protocol, and what it would take to get a
>    "xm block-resize" command working?  (Not necessarily do it, but have an
>    idea what probably needs to be done.)
> 

Resizing is supported automatically if running new enough blkback and blkfront!
Resize the backing LVM volume in dom0 and the domU will notice the disk has 
been resized.

There has been discussion (and patches) on xen-devel a couple of years ago.

-- Pasi


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