In a message dated 4/12/2007 1:57:45 P.M. Central Daylight Time, [EMAIL PROTECTED] writes: >I am trying to determine if an OFFLINE volume exists without trying to VARY it on-line. Build a subroutine to do one I/O to a device, whose device number is passed as a parameter, using STARTIO or EXCPVR, and in which the only CCW is NOP. Make sure that IOS does not add any prefix to your channel program. Then test the IOSB completion code for X'7F'. Build a subroutine driver that scans all UCBs and calls the subroutine for each UCB that is offline or that looks possibly bogus for any other reason. Before you do the I/O, however, make sure that the device has at least one online channel path in the UCB and that nothing really bad is happening with the device (e.g., hot I/O, channel path recovery, boxed, etc.); then PIN it, do the I/O, and UNPIN it. Or call the system subroutine IOSVVARY, which varies one or more devices on/offline, directly yourself. Its address is in the IOCOM. Bill Fairchild Plainfield, IL
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