Re: BUG - 'xl restore' does not overwrite HVM

[Wei Liu <wei.liu2@citrix.com>]

Hello

Please use "reply-all" in the future.

On Tue, Apr 10, 2018 at 09:48:01AM +0000, Peter McLaren wrote:
> 
> 
> Peter McLaren
> 
> 
> ________________________________
> From: Wei Liu <wei.liu2@citrix.com>
> Sent: Tuesday, 10 April 2018 7:01 PM
> To: Peter McLaren
> Cc: Wei Liu; Xen-devel
> Subject: Re: [Xen-devel] BUG - 'xl restore' does not overwrite HVM
> 
> (Add back xen-devel)
> 
> Hello Peter
> 
> Please don't top-post.
> 
> On Tue, Apr 10, 2018 at 08:52:10AM +0000, Peter McLaren wrote:
> > Hi Wei
> > I would like the restore command to return the HVM to the exact state it was at when the save command was performed.
> > Thanks
> > Peter
> 
> >>I think what you need is disk snapshot -- because you want your disk >> to return to its previous state.
> 
> >> I don't think xen 4.4 supports that. IIRC even the latest version of Xen
> >> doesn't have disk snapshot support. You will have to manually >> snapshot your disk (like using lvm snapshot).
> 
> (Apologies - I had to look up top-post to understand what you meant)
> Snapshotting (in Linux) enables one to track changes. I am looking to
> achieve the following. 'xl save' saves a running domain to a state
> file so that it can be restored later. 'xl restore' restores from this
> checkpoint file.  And it isn't.  Otherwise what would the purpose the
> commands be? Oddly, it does do the save/restore correctly but for an
> earlier version of Windows.
> 

xl save has a '-c' option. But as said, IIRC xl save only saves cpu and
memory state, but not disk state. You will need to snaptshot the disk
yourself.

That is to say, it anything is committed to the disk, it will stay there
even after you restore the cpu and memory state.

Wei.

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