Just grabbing a couple of entries from the logs, and these are typical:
Non Accelerated backups: Throughput rate: 52.1 MB/min
Agent Accelerated backups: Throughput rate: 118.1 MB/min

Ken Putnam wrote:

> What throughput is reported in the job log?
>
> It's a long shot, but you may have some network
> problems.
>
> Corey Betka wrote:
>
> > I have an odd problem occuring with my installation of BE 7.3: Every
> > backup job appears to be either long formating or secure erasing the
> > target tape before it backs up any files. This causes backup jobs to
> > take 8+ hours when there is 10 GB of data on the tape.
> >
> > Hardware specifics:
> > Dell 120T DLT 7 Tape Changer (Relabeled ADIC unit)
> > Dell PowerEdge 2100 server w/ Adaptec Diff SCSI controller
> >
> > Example logfile:
> > >Job started: Tuesday, January 11, 2000 at 12:01:08 AM
> > >Job type: Backup
> > >Log file: BEX37.txt

> >

>================================================== ====================
> >
> > >Drive and media information from media mount:
> > >Changer Name: ADIC 0
> > >Drive Name: Quantum 0
> > >Media Slot: 5
> > >Media Cartridge Label: DL000002
> > >Targeted Media Set Name: Rotation - Differential
> > >

> >

>================================================== ====================
> > >Job Operation - Backup
> > >Media operation - overwrite.
> > >Hardware compression enabled.

> >

>================================================== ====================
> > >Performing Agent Accelerated backup
> > >
> > >Media Name: "GFS Differential Backup"
> > >Backup of "\\KLINGER\D$ "
> > >Backup set #1 on storage media #1
> > >Backup set description: "GFS Differential Backup"
> > >Backup Type: DIFFERENTIAL - Changed Files
> > >Backup started on 1/11/00 at 7:46:05 AM.
> > >
> > >Backup completed on 1/11/00 at 7:46:25 AM.

> >
> > I have the progress indicators for backup jobs option turned off, so
> > it's not prescanning devices. Catalogs are disk based, not storage

media
> > based.
> > The job is set to overwrite media and is using the Normal method.
> > Block sizes for the quantum drive are at defaults (32K each).
> >
> > Anyone seen this before? Anyone have any ideas?
> >
> > Corey Betka
> > betka@uiuc.edu