8464ch06_HW Implement.fm Draft Document for Review February 7, 2020 3:15 pm Tips:  Consider the following points: GLYPH<SM590000> If you are defining drives that are installed in a system-managed IBM tape library, such  as the TS7700, you must specify  LIBRARY=YES .  GLYPH<SM590000> If more than one IBM Z host is sharing the virtual drives in the TS7700, specify  SHAR- ABLE=YES . This specification forces  OFFLINE  to  YES . It is up to the installation to ensure  the correct serialization from all attached hosts. GLYPH<SM590000> You must use the composite library ID of the TS7700 in your HCD definitions. GLYPH<SM590000> The distributed library IDs are not defined in HCD. To define the remaining TS7700 3490E virtual drives, repeat this process for each CU in your  implementation plan. 6.2.2 Activating the I/O configuration Differences exist in the concurrent input/output definition file (IODF) activation process  between a new tape library implementation and a configuration change that is made to a  library. Changes to the virtual devices’ address range of a library is an example of where  concurrent IODF activation is useful. Note:  As an alternative to the procedures that are described next, you can perform an  initial program load (IPL) or restart of the system. If you are installing a TS7700 for the first time, this installation is a new library from a host  software definition perspective. When you are activating the IODF for a new tape library, the  following steps must be completed to get the tape library or TS7700 online without an IPL of  your systems: Installing a new tape library 1. Activate the IODF. 2. Run MVS console command  VARY ONLINE  to vary online the devices in the library. This  command creates some of the control blocks. You should see the following message: IEA437I TAPE LIBRARY DEVICE(ddd), ACTIVATE IODF=xx, IS REQUIRED 3. Perform the final ACTIVATE. This action is required to build the eligible device table (EDT)  for MVS Allocation. After activation, you can check the details by using the  DEVSERV QTAPE  command. For more  information, see 10.1.2, “MVS system commands” on page 593. Modifications to an existing tape library When you are modifying a tape library so that device addresses can be changed, complete  the following steps: 1. Activate an IODF that deletes all devices from the library.  2. Activate an IODF that defines all of the devices of the modified library. 3. Run MVS console command  VARY ONLINE  to vary online the devices in the library. This  command creates some of the control blocks. You see the following message: IEA437I TAPE LIBRARY DEVICE(ddd), ACTIVATE IODF=xx, IS REQUIRED 4. Perform the final ACTIVATE.  238  IBM TS7700 Release 5.0 Guide