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xen-users
Re: [Xen-users] One Disk, multiple DomUs and Linux Swap
> If I use one logical volume (with complete partition layout) as a
> read-only disk for multiple DomUs it works fine and I can start as many
> DomUs as I want, as long they don't write to the filesystems on that
> disk.
Correct. dom0 can't write to it either, of course.
> But what is if this logical volume contains a swap partition? The swap
> partition is also shared between multiple DomUs and needs to be
> writeable. So it can't be a partition on the logical volume.
Sharing a swap partition between domUs is not going to work. In fact it'll
probably corrupt your virtual machines and crash them rather quickly, since
they'll all be overwriting each other's swap data.
> I'd have to specify an extra disk device for each DomU which contains
> the swap partition, right?
> like 'phy:/dev/vm/test-swap-%d,xvda,r' %vmid
Best to avoid all possibility of them interfering with each other's swap
space - otherwise it's a security problem as well as likely to crash. Giving
them separate LVs as swap devices would be the most straightforward path
here, I think.
Cheers,
Mark
--
Dave: Just a question. What use is a unicyle with no seat? And no pedals!
Mark: To answer a question with a question: What use is a skateboard?
Dave: Skateboards have wheels.
Mark: My wheel has a wheel!
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