Re: [Xen-API] How snapshot work on LVMoISCS SR

[Anil Madhavapeddy <anil@xxxxxxxxxx>]

On 26 Jan 2010, at 22:51, Daniel Stodden wrote:

On Tue, 2010-01-26 at 17:32 -0500, Anthony Xu wrote:

That means if guest linux is executing "yum install kernel" when

creating snapshot, the vm created from this snapshot might be not

bootable.

Yeah, sorry. I got you wrong regarding the VM flush, I thought you were
talking about the backend side. Indeed, we presently don't quiesce Linux
guests.

How's this behaviour different from a sudden physical power-cycle?

A look at /usr/sbin/update-grub shows it atomically moves in the new grub.conf; presumably the yum packages are also careful about not leaving a machine without a bootable kernel at any point during an upgrade...

-anil

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