HiDRO backups; tape blocksize.

Document ID : KB000014456
Last Modified Date : 14/02/2018
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Question:

How do I determine what tape blocksize my Hidro backups are using?   I am writing to IBM 3592 E05 units in a 3494 tape library.

Answer:

. 
HiDRO blocks its records at 65280 so the blocksize for all backups is 65280, regardless of what tape media you are writing to.   Similarly, VM:Backup creates a blksize of 65535. 
So, basically, both are 64K records in length.