Are you made your existing copies using LVM, i.e. each TSM DB volume is on
LVM logical volume with two copies?
If you make DB volume mirrors using TSM then there is no problem to go
beyond VG boundaries.
If you imagine the raw device(s) (of the LVM lv) are partitions, DBVOL is a
logical partition and the DB is a logical volume the things become very
similar (maybe even parts of the code are reused :) :

LVM physical partition  ->      basic storage element
Raw device (for dbvol)  /

LVM LV's logical partition      ->      may have up to three copies
DB volume (for TSM DB)  /       for redundancy

LVM logical volume (data)       ->      requested data content
Database (all volumes)  /

Each TSM DB volume can have up to three copies. But is is YOUR
responsibility to ensure that each DB volume has mirrors. LVM creates PP
copies altogether. TSM DB volumes are mirrored one by one. And you can
create for example two copies for one volume and three copies for another
volume. Or even have one mirrored but the next not (who is so silly to do
such things is a different question ;-)
I've just tested and successfully created two lv's - one is rootvg and
another in newly created tsmvg and made a mirrored TSM DB volume using
them.


Zlatko Krastev
IT Consultant






Pothula S Paparao <9pothula AT SG.IBM DOT COM> on 03.08.2001 12:42:09
Please respond to "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>
To:     ADSM-L AT VM.MARIST DOT EDU
cc:

Subject:        3rd copy of dbvol on other Volumegroup

Hi all,
Im having 2 dbvolume copies on same VG called tsmvg. Im intrsted in keeping
the third copy of the DBvol in rootvg instead in TSMvg . My view in this is
to recover latest dbvolume from rootvg incase of  TSMvg corruption.
Can i keep 3rd copy on rootvg. if so, please let me know the steps involed.

Help in this regard is highly appriciated.
THanks and regards
sreekumar.