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. At least that was the response I got when I asked IBM-MAIN if they were many months ago. If the ENQ does not go across systems, then you could use the address of the UCB, but only if the UCB is guaranteed not to move around, which happens sometimes these days with dynamic devices. Use non-varying info within the UCB that is unique to the device, and non-varying info that describes unique info within the device, such as the extent. Bill Fairchild ---------------------------------------------------------------------- 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
