Since Paul's on South African time and I'm here in California, I had a go.
The UTS Global Tape Subsystem includes the command tapevary(8), used mainly to vary online a tape drive to the system. So, "tapevary on 3028" varies drive 3028 online. It causes the UTSG tape driver to perform an attach, and "tapevary off 3028" performs an unattach. If I have 3028 varied online to one VM Linux and try to vary it online at another, the "Drive Assigned Elsewhere" message appears.
So consider it verified, at least under VM. We had a power outrage, um, outage, today and besides I see no recognition in our driver's code that it's running under VM or LPAR, so I judge that "tapevary on 3028" will issue an attach command regardless.
Hope this is the verification you wanted.
Richard Hitt [EMAIL PROTECTED]
Jim Sibley wrote:
Paul, have you physically verified that UTSG actually works this way on s/390 in both LPAR or under VM? Does it apply to ECKD shared tapes, not dedicated tapes? It the "lock" a UTSG lock or is it a hardware assign/unassign. Without the hardware assign/unassign, it is not really locked from other hosts in the s/390 environment.
Minimally the UTSG Tape Management System will lock the drive(s) and manage tape mount requests, once tapes are mounted the UTSG driver makes the mounted tape accessible to user/app via a logical device named after the tape volume name.
Regards, Jim Linux S/390-zSeries Support, SEEL, IBM Silicon Valley Labs t/l 543-4021, 408-463-4021, [EMAIL PROTECTED] *** Grace Happens ***
