Determine bottlenecks during backup

All,

I'm trying to evaluate the performance of our new backup system.

The tape device is rated at 200 MB/s and is attached to an 160MB/s 5702
SCSI card.

However, on my first test save menu option 21 save I saved 238.7 GB of
data (uncompressed) in about 90 minutes, a throughput of about 45 MB/s.

The iSeries is a model 810 with 2700CPW of which 87% (2349CPW) is
assigned to the primary partition being backed up.

System bus 1 has a 2757 Controller card with 12x4326 RAIDed.  Of those
12 disks, the system ASP contains 10 disks, and a user ASP is configured
with 2 disks.

System bus 28 has the 5702 controller card.


How can I tell if the save is bottlenecked by CPU, disk, bus, or tape
device?

Thanks,

Charles Wilt
--
iSeries Systems Administrator / Developer
Mitsubishi Electric Automotive America
ph: 513-573-4343
fax: 513-398-1121