On 08/21/2014 07:37 AM, Adam King wrote:
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>> Your quoting is horrible. You used the same prefix for your original
>> content as for my reply (">> >" in both cases). I'm not sure what
>> mailer you are using, but it is making conversation difficult.
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> OK, let's see if this is better. Turned out my email app wasn't doing text
> wrap and quoting prefix default was bizarre....my apologies.Better. Still have the long lines issue, but at least the quoting worked :) >> Also, be aware that snapshot deletion does NOT shrink the listed disk >> size of a file, although with newer qemu, it DOES punch holes so that >> the amount of disk space actually occupied by the file is smaller. Or >> put another way, qemu-img (which is all the more libvirt >> snapshot-delete >> is using) does not know how to compact an image after deleting >> snapshots >> (no one has yet written a qcow2 defragmenter, although such a thing >> should be technically doable). In your situation, I'd highly >> recommend >> looking into virt-sparsify from libguestfs - that's a program that is >> designed to copy (or even attempt in-place) disk images so that the >> copy >> doesn't need as large of a file size. >> > > That certainly does sound useful. I have found > http://serverfault.com/questions/329287/free-up-not-used-space-on-a-qcow2-image-file-on-kvm-qemu > which, frankly, seems like a hack. that page requires offline modification (and so does virt-sparsify). But there IS a potential solution that can be done without taking the guest offline: live storage migration with 'virsh blockcopy': If APP01 is currently using (bloated) disk1.img, it is possible to do a sequence of commands that still keeps APP01 running the whole time but switches APP01 over to using a (brand-new, and therefore unbloated) disk2.img with no impact to the guest contents. Right now, it's still necessary to go through a transient domain (which highlights the risk that qemu doesn't make the command restartable, so you don't want the guest to go down during the window of the operation): virsh domblklist APP01 # learn what strings you can use for $disk below virsh dumpxml APP01 > tmp.xml # save the domain, to re-define it later virsh undefine APP01 # go transient, to allow blockcopy virsh blockcopy APP01 $disk /path/to/disk2.img --verbose --wait --pivot $EDITOR tmp.xml # change disk1.img to disk2.img virsh define tmp.xml # back to normal -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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