How to find maximum block size for tape device.

Hi All,

We have netbackup 7.1 installed on Solaris server. We are using LTO4 & LTO5 tapes for backup. I need a help to find the maximum block size for LTO4 & LTO5 tapes. Is there any way to find it out from netbackup end.

Some NDMP jobs are there in my environment and Data buffer size for NDMP is 64kb which reduce the backup throughput. I wanted to change it to 256kb for better performance but before that I wanted to check the maximum block size of tape.

Thanks in advance.