Select a block size to match your environment. The default block size must be a multiple of 256 and a minimum of 8192. When calculating the optimal block size, remember that the file contains keyed records with a 17 byte key.
The default parameters allow for 5,000 ACIDs and 1000 (DASD) volumes.
The file structure allows in excess of 3 million ACIDs to be defined in the security file.
Use half‑track blocking if you specify more than 2,318,336 ACIDs. The best block size for half‑track blocking is 27,648. However, any block size greater than 17,920 results in half‑track blocking. With half‑track blocking, two physical blocks of data reside on a track of the device. The smaller the block size, the fewer the number of ACIDs that can be defined for each block.
If the block size is not specified, TSSMAINT determines a default based on the type of device the file resides on.
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