----- Message from Stefan Hajnoczi <stefanha@xxxxxxxxx> ---------
Date: Thu, 20 Oct 2011 07:43:45 -0700
From: Stefan Hajnoczi <stefanha@xxxxxxxxx>
Subject: Re: Convert one .img disk created with sparse=true to no sparse
To: Gonzalo Marcote Peña <gonzalomarcote@xxxxxxxxx>
Cc: kvm@xxxxxxxxxxxxxxx
On Thu, Oct 20, 2011 at 4:21 AM, Gonzalo Marcote Peña
<gonzalomarcote@xxxxxxxxx> wrote:
Hi.
I have one guest that I created with virt-install comand option
'sparse=true'.
As i want to use now this guest for I/O tasks (DDBB) and i want to
improve performance, I want to convert the disk.img from sparse to no
sparse (obviusly without format it).
How can I do this task without loosinf the disk image data?.
If you are using a raw image file:
$ cp --sparse=never old-sparse.img new-allocated.img
This copies the data into the new file and does not try to make zero
regions sparse. You can then replace the old file with the new file.
Stefan
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----- End message from Stefan Hajnoczi <stefanha@xxxxxxxxx> -----
If working with a NON-sparse VM img (i.e. originally created with
virt-install --nonsparse), does a cp without --sparse=never retain the
non-sparse nature of the file, or does it have to be specified?
Simon
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