[Xen-users] Re: restoring files to guest domains

[Martin Leben <ml060223@xxxxxxxx>]

Hi Jared,

Jared wrote:
> * What's the purpose of allowing write support to a snapshot if the 
> written files are not populated on the original volume?
For some use cases this is a good feature. However, it is of no interest in your 
use case, as you might have guessed by now. :-)
> I don't get the 
> "benefit" of being able to write to a snapshot if the changes will be 
> completely discarded.
The writes will not be discarded. They are written to the snapshot. (Which, in 
YOUR use case, will be discarded after a while.)
> ... Based on that, and on the bullet above, I figured there may 
> be some "reverse" caching or something (for lack of a better term) that 
> would flush changes written to the snapshot back to the source volume as 
> well.
No, that is not the case.


> ... Since I'm 
> working with volumes created and managed on the host, it seems 
> reasonable to assume that there should be some way to write data to the 
> volumes.
No, not while the guest is running. Unless you are using a file system that can 
handle with writes from more than one host to the same block device. I don't 
know of any that doesn't use some network interconnect for managing the shared 
access.
Good luck!

BR
/Martin Leben


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