I have 1 master server, and 2 media servers connected over fiber to an 
L700. Im not sure what the switch in the middle is as didnt install the 
system or have any info on it.

There are 5 drives in the L700 and 3 of them are shared with sso option 
to the master, and both media servers.

People i have had an issue lately with drives being not visible to one 
of my media servers.

I have fixed this by unloading the fibre hba using cfgadm and loading it 
again. It then can see the devices under sgscan and has seen them under 
/dev/rmt

I also noticed the customer had removed a /etc/hosts entry for the media 
servers to talk to each other by the correct name so i put that back in 
and can now talk on port 13701 to each machine in the nbu setup.

Whats happening now though is drives just keep going down on the media 
servers and backups are not working. I have ITC enabled so each media 
server needs to lock 2 drives.

I have looked the bptm logs and cant see anything jumping out apart from 
many request medias of different tape ids.
I have looked in /usr/openv/volmgr/debug/ltid/ and the logs in their 
show successfully on communicating shared drive info to the master.

Therefore i am now stuck and have no idea whats going wrong :(

Anyone any advice/pointers? Is ether anything specific i should be 
looking for in the logs or are there other important logs im not checking.

Thanks