Re: [Xen-users] xl save/restore command

[Ian Murray <murrayie@xxxxxxxxxxx>]

>________________________________
> From: Melanie Desaive <desaive@xxxxxx>
>To: xen-users@xxxxxxxxxxxxx 
>Sent: Thursday, 28 August 2014, 13:04
>Subject: [Xen-users] xl save/restore command
> 
>
>Hello everybody,
>
>I am currently trying to figure out, what the xl commands "save/restore" 
>are exactly doing in case I leave the domain running after issuing the 
>save command.
>
>I tested the following szenario:
>
>---
>
>Saving domain with "xl save -c <domain> <statefile>"
>
>After completion creating a new file on domU.
>
>Destroying domU
>
>Restore domU with "xl restore <statefile>" -> The new file disappeared 
>from domU.
>
>Shutdown domU
>
>Recreate domU from configfile with "xl create <configfile> -> The file 
>is back again.
>
>---
>
>Does the save command checkpoint the domUs filesystems so that it can be 
>used to create kind of a snapshot?

As far as I know, xl save/restore are not storage aware. You might want to 
consider Xl save -p then then using your storage method's native snapshotting 
technique. I only use logical volumes, so apologies if that answer is incorrect 
for other storage types.

I notice there is a problem with xl save -p when using Xenified kernels such as 
CentOS 5. I wrote the -p patch but heavily under the guidance of proper devs, 
so I can't say I understood the ins and outs of it.


In terms of the scenario you describe, I would say (without futher information) 
that the new file wasn't fully committed to storage when you destroyed the domU.


>
>Can someone point me to some in depth documentation or maybe give a 
>short summary, what the command is actually doing?
>
>Many thanks in advance.
>
>Kind regards,
>
>Melanie
>---
>
>
>
>
>_______________________________________________
>Xen-users mailing list
>Xen-users@xxxxxxxxxxxxx
>http://lists.xen.org/xen-users
>
>
>

_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxx
http://lists.xen.org/xen-users