Hello again. Thank you for your replays.
I was able to restore the machine in the following (not professional) way:
1. Install AIX 6.1 on the same partition. (the old install was completly destroyed).
2. Configure the network and access the NFS.
3. Change current directory to / (root).
4. Execute: restore -xf /NFS_path_to_the_backup.
5. reboot.
It worked like charm.
However it have many obvious drawbacks. One of them is that I needed to expand the FS for /, /usr,/var and /opt. This directories contained valuable data that I needed to restore.
I spend some time today experimenting with archive and boot from DVD procedure .
mkdvd turned out to be excellent program for generating archive DVDs. Especially when I use -S option to generate ISO only.
I have few questions:
1. What will happen when the ISO image exceeds the largest DVD capacity ?
2. I tried to use bootp from SMS menu, and it turned out that DHCP request are correctly understood by our linux DHCP server. Also the server correctly understod the bootp requests. Unfortunatly I do not know how AIX boot process is working (i.e. what boot file to send in response to bootp requests). We are using PXE + tftp to install Linux machines fully automated. My question is can I use this PXE server instead of configuring additional NIM server only for AIX OS ? I only want to be able to boot this DVD images over the network. As long as they are standard I may mount them on the DHCP server, and serve the files that AIX needs to install itself.
Here is what I found concerning VIOS installation from the PXE server.
IBM Redbooks | VIOS Network Install from Linux Server
I intend to adapt this method for booting AIX 6.1.