> >There should still be write inhibit "switch" for a volume, even if > only a logical one. It can be very useful, when running under z/VM, > to be able to define some z/OS volumes as read-only. It would be > nice if you could do something similar in a z/OS LPAR. > > Amen. We could really use this feature. It could be an option when > defining devices in the IOCP.
z/VM intercepts every SSCH done by its guests, and examines/modifies the guest channel programs. LPAR does not routinely intercept guest SSCH. So it would likely not be reasonable for LPAR to provide a write inhibit switch for a device. z/OS does scan and modify DASD channel programs, so it might be reasonable to have DASD UCB switch which says to set the mask byte in the Define Extent (or analogous command) parameter to inhibit all write operations. Jim Mulder z/OS System Test IBM Corp. Poughkeepsie, NY ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
