Ross Boylan wrote:
Thanks for all the info. I have one follow up.
On Wed, 2009-05-13 at 10:07 +0300, Avi Kivity wrote:
As I install software onto a system I want to preserve its
state--just
the disk state---at various points so I can go back. What is the
best
way to do this?
LVM snapshots. Read up on the 'lvcreate -s' command and option.
I may have been unclear. I meant as I install software on the VM.
Since some of them are running Windows, they can't do LVM. I am running
LVM on my host Linux system.
Or are you suggesting that I put the image files on a snapshottable
partition? Over time the snapshot seems likely to accumulate a lot of
original sectors that don't involve the disk image I care about.
Or do you mean I should back each virtual disk with an LVM volume? That
does seem cleaner; I've just been following the docs and they use
regular files. They say I can't just use a raw partition, but maybe
kvm-img -f qcow2 /dev/MyVolumeGroup/Volume10 ?
You can certainly use a raw partition, for example
qemu-system-x86_64 -drive file=/dev/vg0/guest1,cache=none
Does that give better performance?
That is the highest performing option, especially with cache=none.
The one drawback I see is that I'd
have to really take the space I wanted, rather than having it only
notionally reserved for a file.
Yes, that's a drawback, and there's currently no way around it.
I'm not sure how growing the logical
volume would interact with qcow...
It should work, but I wouldn't recommend it.
--
error compiling committee.c: too many arguments to function
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