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JCBUFFER
If the resource type is JCBUFFER, with resource name AVAIL_nn ("nn" is a journal number in the range 01 through 99), the buffer is probably nearly full, or the journal is unavailable, for example, because of a volume switch or an output error.
If the resource type is JCBUFFER, with resource name JCTAECB, the task that has requested shutdown is waiting for the journaling task to flush the buffer, close the journal, and terminate itself.