Hi Zaxxon,

thanks for your quick reply.
Unfortunately if Im using mkfs, all preexisting data will be lost.

Let me explain my scenario :
We have two sites.
Site 1 has an AIX connected to a Storage through iscsi protocol. This is the production site. This AIX server use LVM to create VG, PV, LV with no problem.(LV command is formating.

Site 2 (disaster Site) has a second SAN Storage which is receiving mirrored data from Site 1. A second AIX server is attached to this second Storage through iscsi ( this LUN is a data replication from Site 1)
The idea would be to mount the LUN ( which is already populated) on the second AIX through LVM. This is where I get Stuck as I cannot create an LV and mount the system until I do a MKFS !!!!
Is this a normal behavior ? did I miss something ?

Thanks a lot
Ivan