On Tue, 1 Aug 2006 11:01:04 EDT, IBM Mainframe Discussion List <[EMAIL PROTECTED]> wrote:
> > >In a message dated 8/1/2006 8:53:00 A.M. Central Daylight Time, >[EMAIL PROTECTED] writes: > >>I believe that he means the DEB information, i.e., the UCB addr/volser + the >>starting extent. >The DEB contains the address of the UCB, but the address of the UCB is not >canonical across systems. Instead of saying "the UCB addr", I believe you >mean the device number contained within the UCB pointed to by the DEB. The >2-byte field that used to be called device address, or channel/unit address, was >changed with S/370-XA, and since ca. 1982 has been called the device number. >Device numbers are canonical across systems. Nothing in the system will stop me from creating an I/O configuration that has a shared device at on different systems with different device numbers. It's not my preference, but it is perfectly permissable. Tom Marchant ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
