Draft Document for Review February 7, 2020 3:15 pm 8464ch10_OperSW.fm The  OP0138  message indicates the media type that is out in the common scratch pool. These  messages do not remain on the MVS console. The intervention conditions can be viewed  through the TS7700 MI.  If the TS7700T is in a grid configuration, and if its associated distributed library enters the  out-of-empty-stacked-volume state, operations are affected in the following ways: GLYPH<SM590000> All copy operations are immediately suspended in the cluster (regardless of which pool  has become empty). GLYPH<SM590000> If the cluster features a Copy Consistency Point of RUN, the grid enters the Immediate  Mode Copy Operations Deferred state. An MVS console message is generated: GLYPH<SM590000> The copy attempt fails if another cluster attempts to copy a logical volume that is not  resident in the cache. GLYPH<SM590000> The grid prefers clusters that are not in the out-of-empty-stacked-volume state in choosing  a TVC cluster, but the grid can still select a remote TVC whose cluster is in that state. If  the data that is needed is not in the remote cluster’s TVC, the recall of the data fails. If data  is written to the remote cluster’s TVC, the writes are allowed.  However, because no empty physical volumes might not be available to copy the data to,  the cache might become full of data that cannot be copied. In this case, all host I/O that  uses that cluster’s TVC becomes throttled to prevent a cache overrun. Monitor the number of empty stacked volumes in a library. If the library is close to running out  of a physical volume media type, expedite the reclamation of physical stacked volumes or add  volumes. You can use the Bulk Volume Information Retrieval (BVIR) function to obtain the  physical media counts for each library. The information that is obtained includes the empty  physical volume counts by media type for the common scratch pool and each defined pool.  If your Pool properties include a Second Media that is defined and the primary media type is  exhausted, the library does not go into degraded status for out of scratch. CBR3787E One or more immediate mode copy operations deferred in library library-name. The TS7700T or TS7700C enters the Above Threshold Warning state when the amount of  data to copy exceeds the threshold for the installed cache capacity for five consecutive  sample periods (the amount of data to copy is sampled every 30 seconds). The TS7700T or  TS7700C leaves the Above Threshold Warning state when the amount of data to premigrate  is below the threshold capacity for 30 consecutive sample periods. The consecutive sampling  criteria is to prevent excessive messages from being created.  This state surfaces the following message: When the condition is no longer present, the following message is surfaced: CBR3750I Message from library  library-name :OP0160 Above threshold for uncopied  data in cache, throttling possible. Severity impact: SERIOUS. CBR3750I Message from library  library-name :OP0161 Below threshold for uncopied  data in cache. Severity impact: INFORMATION. Above Threshold Warning state  610  IBM TS7700 Release 5.0 Guide