copying lvm with the same name

[jdow]

From: "Dr. Michael J. Chudobiak" <mjc at avtechpulse.com>
Sent: Thursday, 2009, March 19 05:10


> Frank Cox wrote:
>> It looks like the machine can see the second drive and the lvm that's on 
>> it
>> /dev/sdb2, but it has the same VolGroup name as /dev/sda2.
>
> Yes, this is common and annoying. Here is the guide that I followed when 
> it happened to me:
>
> http://www.whoopis.com/howtos/linux_lvm_recovery.html
>
> I filed bug 461682 (https://bugzilla.redhat.com/show_bug.cgi?id=461682), 
> requesting that the default volume names not be so generic - they now 
> incorporate the hostname, so this problem should be much less common in 
> F11+.

That's a wrong solution. GUIDs were invented to handle this sort of problem.
Suppose "Fred" has a machine he called "boundless". He has a disk problem.
He asked "Judy" to fix it. And for unknown reasons "Judy" also has a machine
called "boundless". GUIDs to the rescue.

The only time GUIDs will fail is when you use "dd" to create as good a 
back-up
as you can of a dying disk. Sometimes this is a bad thing, as in the 
scenario
under discussion. Sometimes it is a good thing, as when I performed that 
sort
of a recovery on an NTFS laptop drive. I didn't even have to reinstall 
anything
after NTFS chkdisk massaged the drive. (It had a directory block it could 
not
update - on the "C:" drive.)

Sadly GUIDs are too complicated for the people naming disk partitions.

{^_^}   Joanne