[fedora-virt] Shared swap among Guests?

[Eric Blake]

On 11/23/2011 06:01 AM, Frank Murphy wrote:
> Can a single physical disk,
> be used as a shared swap-drive.
> Among virtual Guests?

As long as guests aren't using the same disk at the same time, then yes,
it is possible to assign a disk image to more than one guest.  The
libvirt-lock-sanlock package in Fedora can help ensure the mutual
exclusion of only one guest running at a time while using the otherwise
shared disk.

But having multiple guests simultaneously running while using the same
disk image for shared swap is a recipe for disaster.

> 
> Guests would be Fedora\CentOS\Maybe an odd Ubuntu.
> 
> If yes, how to adapt current images for such.

Update the XML of each guest that will share the host resource to point
to the same host source location; and probably also modify the guests'
/etc/fstab to correctly mount swap onto that virtual disk.

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

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