Draft Document for Review February 7, 2020 3:15 pm 8464ch10_OperSW.fm Note:  The  DS QT  command with the  QHA  operand can display which systems and SYSplexs  are connected to a specific device in a cluster. For more information, see 10.10.2, “Other  commands built to support CUIR functionality” on page 618. Clarification:  The distributed library number or cluster index number for a specific logical  drive can be determined by using the  DS QT  command. As shown in Figure 10-1, the  response shows LIBPORT-ID 01 for logical drive 1C01. LIBPORT-ID 01 is associated with  Cluster 0. For more information about the association between distributed libraries and  LIBPORT-IDs, see 6.2.1, “Defining  devices through HCD” on page 234. From the  DS QT  command that is shown in Figure 10-1, you can derive the LIBRARY-ID for the  composite library and the LIBPORT-ID of the logical control unit (LCU) that is presenting the  logical device.  The real device type of the physical devices is unknown to the host, and DEVSERV always  shows 3592 as DEVTYPE. The LIBID field identifies the composite library ID associated with  the device. Figure 10-1 Sample DEVSERV QT command output The following command shows the syntax: The following are the values in the command: DS QT, devnum ,1,RDC DS Device service QT Query tape devnum Device address 1 Number of devices to be displayed RDC Read device characteristics Figure 10-1 shows the output of a  DS QT  system command. DS QT,1C01,RDC IEE459I 15.03.41 DEVSERV QTAPE 570 UNIT DTYPE DSTATUS CUTYPE DEVTYPE CU-SERIAL DEV-SERIAL ACL LIBID 1C01 3490L ON-RDY 3957C2A 3592 * 0178-272BP 0178-272BP I 3484F READ DEVICE CHARACTERISTIC 34905434905400E0 1FD88080B61B41E9 00045AC000000000 3957413592410002 0 3484F0101 000000 4281000004000000 0400000000000000 0000000000000000 **** 1 DEVICE(S) MET THE SELECTION CRITERIA **** 1 DEVICE(S) WITH DEVICE EMULATION ACTIVE 3484F – Composite LIBRARY-ID 01 – LIBPORT-ID 01 – Distributed LIBRARY-ID 602  IBM TS7700 Release 5.0 Guide