8464ch09_Oper.fm Draft Document for Review February 7, 2020 3:15 pm On the TS3500 tape library, the time can be set from IBM Ultra Scalable Specialist work items  by clicking  Library  Date and Time , as shown in Figure 9-132. Figure 9-132 TS3500 tape library GUI Date and Time More information about TS4500 tape library is available locally in the TS4500 GUI by clicking  the question mark icon, or at IBM Knowledge Center. 9.6.2 Physical Tape Library paused or degraded During the operation, the tape library can be paused, which might affect the related tape  attach cluster, regardless of whether it is in a grid. The reasons for the pause can include an  enclosure door that is being opened to clear a device after a load/unload failure or to remove  cartridges from the high capacity I/O station. The following message is displayed at the host  when a library is in Pause or manual mode: During Pause mode, all recalls and physical mounts are held up and queued by the TS7700T  for later processing when the library leaves the Pause mode. Because scratch mounts and  private mounts with data in the cache are allowed to run (but not physical mounts), no other  data can be moved out of the cache after the currently mounted stacked volumes are filled.  CBR3757E Library  library-name  in { paused  | manual mode} operational state During an unusually elongated period of pause (such as during a physical tape library  outage), the cache continues to fill up with data that is not migrated to physical tape volumes.  This issue might lead in extreme cases to significant throttling and stopping of any mount  activity in the TS7700T cluster. The TS7700T cluster inherited many of the behaviors from the original TS7740 with small  cache size. Considering the current TS7700T with bigger cache partitions, it is possible to  continuing operating with physical tape library degraded or non-operational for an extended  period. The LI REQ PHYSLIB SETTINGS commands allow the user to keep the TS7700T tape  partition to operating normally in the case of the physical tape library extended outage (with  exception of recalls). The LI REQ PHYSLIB parameters allow the TS7700T to go over the  licensed amount of the pending premigration tape capacity (FC 5274) without throttling the  tape attach partition.  At previous levels of code, having the PRETHDEG setting disabled did help clients work  around a physical tape library outage. However, after the tape library became operational  For more information about this command, see  TS7700 z/OS Host Command Line Request  User’s Guide , WP101091. 576  IBM TS7700 Release 5.0 Guide