[libvirt-users] Pivot without copy

Eric Blake eblake at redhat.com
Tue May 19 21:36:23 UTC 2015

On 05/19/2015 03:29 PM, Mathew Moon wrote:
> Hi,
>     Sorry about top-posting, didn't know it was a nuisance. As for

It's okay - we were all new once.

> developing,
>     I wish I could but I have never spent any time coding in c, c++, etc. I
> am a systems guy, not a developer, so I only work with scripting languages.
> I would love to have the tech chops to contribute though. If I have a
> chance I will look through the relevant code and see if there is anything
> that I can do, but I suspect it will be a bit over my head.

That's okay. Even offering to test patches when they are eventually
written is useful.

>     I will definitely check out doing snapshot-revert with internal
> snapshots and hot plugging. With hot plugging I assume you mean to create a
> storage volume, put it in as a virtual 'cd drive' and mount it that way. Is
> that correct?

Not quite a virtual 'cd drive', but an actual IDE, SCSI, or USB drive,
at least as far as the emulation presents it from the guest's point of
view.  The commands 'virsh attach-disk' and 'virsh detach-disk' are the
hot-[un]plug wrappers, which basically behave the same as bare metal
system adding or removing a disk from the hardware bus while the guest
is running (not all hardware handles it gracefully, but there are
definitely storage arrays out there that manage just fine).

Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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