any possible conflict between host and guest "VolGroup00" VGs?

[Robert P. J. Day]

i'm perusing the section on "Accessing data on guest disk images"
here:

http://fedoraproject.org/wiki/Getting_started_with_virtualization#Accessing_...

and noticed that, because i accepted the default volume group name for
both host and guest, both of them have a volume group name of
"VolGroup00", which confused me for just a few seconds until i
realized what was going on.

but other than being confusing, is there any potential clash that
could result from having the same volume group name in both cases?

rday
--

========================================================================
Robert P. J. Day                               Waterloo, Ontario, CANADA

Linux Consulting, Training and Annoying Kernel Pedantry.

Web page:                                          http://crashcourse.ca
Linked In:                             http://www.linkedin.com/in/rpjday
Twitter:                                       http://twitter.com/rpjday
========================================================================

[Richard W.M. Jones]

On Tue, Apr 21, 2009 at 06:52:19AM -0400, Robert P. J. Day wrote:
> i'm perusing the section on "Accessing data on guest disk images"
> here:
>
> http://fedoraproject.org/wiki/Getting_started_with_virtualization#Accessing_...
>
> and noticed that, because i accepted the default volume group name for
> both host and guest, both of them have a volume group name of
> "VolGroup00", which confused me for just a few seconds until i
> realized what was going on.
>
> but other than being confusing, is there any potential clash that
> could result from having the same volume group name in both cases?

Oh yes:

https://bugzilla.redhat.com/show_bug.cgi?id=207470

Anyway, may I take this opportunity to pimp libguestfs, which solves
all of the above problems, and doesn't require you to be root:

http://et.redhat.com/~rjones/libguestfs/

Rich.

[Daniel P. Berrange]

On Tue, Apr 21, 2009 at 06:52:19AM -0400, Robert P. J. Day wrote:
> i'm perusing the section on "Accessing data on guest disk images"
> here:
>
> http://fedoraproject.org/wiki/Getting_started_with_virtualization#Accessing_...
>
> and noticed that, because i accepted the default volume group name for
> both host and guest, both of them have a volume group name of
> "VolGroup00", which confused me for just a few seconds until i
> realized what was going on.
>
> but other than being confusing, is there any potential clash that
> could result from having the same volume group name in both cases?

Yes, if you ever need to expose the guest's volgroup in the host for 
some reason, you'll end up with a clash.

For this reason I always tend to give my hosts a VG name of 'HostVG'
and guests 'GuestVG' - or even give each guesta VG name based on the
guest name.

Daniel