> I'm running a level 1 backup on just one Qtree and tape drive is writing at 
> 11MB/s on LTO3 tape drive. Does that sound OK?

What else is your filer doing at the time of the backup?  What's in
its /etc/messages during the time of the backup?  Do you have enough
spindles to service the workload? How fragmented is the volume (have
you analyzed or ran re-allocation?)  do you have plenty of free space
at the aggr level?  Do you have performance advisor to monitor the
filer while performing the backup?

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