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Re: copying lvm with the same name



From: "Dr. Michael J. Chudobiak" <mjc 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
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