Is there a way to increase the size of the tape blocks that NetBackup
(3.4.1) writes?  I am trying to improve the performance of an STK 9840 tape
drive connected via fibre to a SAN.  Using NetBackup (and my test data) I
was only able to achieve backups at the rate of 6.5MB/sec.  

I got similar results using GNU tar and the default block size of 64KB, but
when I increased the block size to 256KB I backed up the same data at the
rate of 12MB/sec.  

NetBackup uses a block size of 64KB.

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Michael Gajda                 michael.gajda AT ssmb DOT com                
Salomon Smith Barney    Dasd Management/Vital Records
745 Route 3                    phone: 201-231-3408   
Rutherford, NJ 07070