Our numbers vary greatly according to the clients.  We have very old Solaris 
machines that backup at 50+ MB/sec.  We have very new Windows machines where 
throughput varies greatly between different volumes on the same machine (e.g. a 
volume with 5 million tiny files backs up at 30 MB/sec via FlashBackup, while 
another volume on the same machine gets about 7 MB/sec backing up small files 
via FlashBackup).

It's difficult to get good numbers because we use multi-streaming and 
multiplexing like crazy.  So the actual throughput to the drive is the sum of 
the jobs using the drive at that moment.  Individual jobs vary between 5 MB/sec 
and about 65 MB/sec.  But the total throughput to the tape heads is unknown.

Anyone know an easy way to calculate that?

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