Funny you should ask. I've been working on that quite a bit recently.

IBM NetFinity 7000
4x200MHz P2 CPU's
1gig RAM
dual 100mb Ethernet (one dedicated for backups)
+25gig RAID 5 for disk storage pools
3447 DLT Tape library with dual DLT drives
NT 4.0, SP4
ADSM 3
Client compression on, TCP/IP tuning, etc.

The best we can do with this machine is restoring 1.5gig/hr over the
network.  The data we're backing up is lots of small (<1meg) files that
don't compress much.  (My understanding is that if you have huge
mega-files,
ADSM does better.)

We've got a requirement to restore 260gig overnight or better. ADSM just
isn't good enough.  An early test with BackupExec on a much lesser machine
gave 6 to 7gig/hr. (DSS3 12gig tape, 1 CPU, 200meg RAM)

If this holds true on production quality hardware, we're dumping ADSM.

____________________________________________________________
Mitchell Ross                           mailto:mitch.ross AT ncgroup DOT com
CompuCom Systems, Inc.          http://www.ncgroup.com
The Source for Technology Deployment Processes and Standards