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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. 

The following command shows the syntax: 

DS QT, devnum ,1,RDC 

The following are the values in the command: 

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. 

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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. 

