Re: [Qemu-devel] [RFC] block-trace Low Level Command Supporting Disk Introspection

[Wolfgang Richter]

On Wed, May 22, 2013 at 3:26 PM, Richard W.M. Jones <address@hidden> wrote:

On Wed, May 22, 2013 at 02:32:37PM -0400, Wolfgang Richter wrote:
> On Wed, May 22, 2013 at 12:42 PM, Richard W.M. Jones <address@hidden>wrote:
>
> > Run up to two extra guestfish instances, with the same result.  The
> > fourth guestfish instance hangs at the 'run' command until one of the
> > first three is told to exit.
>
>
> And your interested on being notified when a snapshot is "safe" to read
> from?
> Or is it valuable to try reading immediately?

I'm not sure I understand the question.

I assumed (maybe wrongly) that if we had an NBD address (ie. Unix
socket or IP:port) then we'd just connect to that and go.

I meant if there was interest in reading from a disk that isn't fully synchronized

(yet) to the original disk (it might have old blocks).  Or would you only want to

connect once a (complete) snapshot is available (synchronized completely to

some point-in.

--
Wolf