If block size specified in JCL is max block size the program can use when writing to tape, then I think I can' chage the block dize dss use to write to tape dsn. From GTF trace, someone helped me find dss was using 56062 as the block size to write, however when read, from SMF , we found dss use 262144. Is that ok for a program to write in 56062, but read in 262144?
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