[Fedora-xen] resizing Xen para-virtualized guest partition

[John Summerfield]

Daniel P. Berrange wrote:
> On Mon, May 07, 2007 at 08:41:29PM -0400, Paul Wouters wrote:
>> On Tue, 8 May 2007, John Summerfield wrote:
>>
>>> btw You can create sparse files in the first place:
>>> dd if=/dev/zero of=/tmp/ext-fs seek=$((4*1024*1024)) count=0
>>> mke2fs -F -q /tmp/ext-fs
>> I understood that using sparse files will significantly slow down
>> the xenu for the first time, as it keeps growing the fs allocation
>> underneath it.
> 
> That is correct. Never use sparse files if you care about performance
> as they exhibit pathelogically bad behaviour while growing the allocation.
> Pre-allocation a file should give the best performance for file backed
> guests, as close as you'll get to native without using physical devices
> directly.
> 
> With a little tweaking to the dd command shown above though it ought to
> be possible to extend the image, while allocating the data. You basically
> want to seek=<current end of file>  and then count=<additional space>
> desired.
> 
> Dan.

Please read ny sig. I really do not want off-list replies. Once I have 
ADSL at home when I move house, hopefully in a couple of weeks, they 
will simply bounce.

Daniel, are you able to sort out the list owner to get replies going, by 
default, to the list?

Thank so much.



-- 

Cheers
John

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