Splitting the Mirrored Boot Disk

[ASOEASTGEOGRAPHY]

I am going to update a systems form 10.20 to 11.00. The customer has the root drive mirrored. Is it possible to split the mirrors and leave one volume on 10.20 and update the other to 11.00 using the upgrade path and not the cold install path?

Does the lvreduce command erases the information on the alternate disk I'm removing?

[Victor BERRIDGE · Accepted solution]

Hi,
I never tried using lvsplit but I dont see any reason for it to not work, no garanty thought because it wasnt the purpose of such command...
(backups etc.)
I usually unmirror the system, and use th newly spared disk to do a cold install, then I have 2 boot options :HPUX10.20 or HPUX11...
If I remember right yes lvreduce erases information of the mirrored disk

[David Totsch]

Yes, split your mirrors and attempt the upgrade. After you have accepted the upgrade (couple of weeks without problems), lvmerge.

If you cannot accept the upgrade (you want to fall-back), you will need to follow a more complex process, but I have done this successfully.

-dlt-