What you really need to find out is how fast are you sending data to the LTO
tape drives.  The tape drives can only go as fast as the data stream you
send to them.  Or as fast as the destination can accept on a restore.  If
you are only sending 2.5 MB/sec to the tape drives, then don't complain when
the tape drives run at 2.5 MB/sec.

You state that you are doing a backup.  What size and how many files are you
sending.  If this is a LAN backup, how much bandwidth does your TSM server's
network have?  If this is a backup from the TSM server's local storage, what
type is it?

If you have lots of small files, or your are bandwidth limited because of
your network.  You should send the backup to disk storage, then migrate off
to tape.

Check the following settings and try setting them to these values.

TSM Server:

TXNGroupmax 256
MOVESizethresh 500
MOVEBatchsize 1000

TSM Client:

TXNBytelimit 2097152

Also upgrade to the latest level of microcode.  And if all else fails,  open
a support call with IBM and have them assist you.

James Thompson

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