8464ch10_OperSW.fm Draft Document for Review February 7, 2020 3:15 pm 1D22 COMPLIB1 Y A00999 DISTLIB2 DISTLIB2 DISTLIB3 1D35 COMPLIB1 Y A00008 DISTLIB2 DISTLIB2 DISTLIB3 1D42 COMPLIB1 Y A00075 DISTLIB2 DISTLIB1 DISTLIB3 1E1F COMPLIB1 Y A00117 DISTLIB3 DISTLIB3 1E21 COMPLIB1 Y A02075 DISTLIB3 DISTLIB1 1E30 COMPLIB1 Y A01070 DISTLIB3 DISTLIB1 1E56 COMPLIB1 Y A00004 DISTLIB3 DISTLIB2 1E68 COMPLIB1 Y A00576 DISTLIB3 DISTLIB3 For more information about this command and its output, see  z/OS DFSMS Object Access  Method Planning, Installation, and Storage Administration Guide for Tape Libraries ,  SC23-6867. GLYPH<SM590000> DISPLAY M=DEV( xxxx ) The  D M=DEV  command is useful for checking the operational status of the paths to the  device (see Example 10-9). Example 10-9 D M=DEV D M=DEV(2500) IEE174I 04.29.15 DISPLAY M 626 DEVICE 02500 STATUS=OFFLINE CHP B2 B3 B8 B9 ENTRY LINK ADDRESS 20 21 22 23 DEST LINK ADDRESS D4 D5 D6 D7 PATH ONLINE Y Y N N CHP PHYSICALLY ONLINE Y Y Y Y PATH OPERATIONAL Y Y Y Y MANAGED N N N N CU NUMBER 2500 2500 2500 2500 MAXIMUM MANAGED CHPID(S) ALLOWED: 0 DESTINATION CU LOGICAL ADDRESS = 00 SCP CU ND = NOT AVAILABLE SCP TOKEN NED = 003490.C2A.IBM.78.0000000H6395.0000 SCP DEVICE NED = 003490.C2A.IBM.78.0000000H6395.0000  The  DISPLAY U  command displays the status of the requested unit. If the unit is part of a  tape library (manual or automated), device type 348X is replaced by 348L. An IBM 3490E  is shown as 349L, and a 3590 or 3592 is shown as 359L. The  MOUNT  command allows you to allocate an I/O device to all job steps that require a  particular volume without intervening de-mountings and remountings of the volume. The  UNLOAD  command enables you to unload a drive if the Rewind Unload (RUN) process  was not successful initially. GLYPH<SM590000> UNLOAD devnum GLYPH<SM590000> DISPLAY U GLYPH<SM590000> MOUNT  devnum , VOL=(NL/SL/AL, serial ) 596  IBM TS7700 Release 5.0 Guide