There is a logical limit of 99,999,998 DSNB records which can be formatted in the TMC. However, the physical limit is actually much smaller unless you have allocated the TMC with DSNTYPE=LARGE.
The limit for the allocation of a standard sequential data set is X'FFFF' tracks or 65,535 decimal tracks. This is equal to 4,369 cylinders on a 3390. The total number of volume records plus half of the total number of DSNB records (there are two DSNB records on each physical record) of an unblocked TMC must be equal to or less than 3,735,492. For a TMC blocked at 8840, this limit is 10,223,457. There are 3 control records.
The X'FFFF' track limit does not apply if the TMC is allocated with DSNTYPE=LARGE. TMSPTRS and TMSFORMT do not support an allocation with DSNTYPE=LARGE specified. Use the replacement utilities TMSAPEC (a subtask of the CTS address space) and TMSXTEND.
For example, if the TMC is allocated as a standard sequential file, you can format the following:
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