[Dump-users] performance difference??

[Ken G. <ke...@pe...>]

Trying to figure out why the performance is so different on
these two servers.

Both are cpq DL380 G2's
dual cpu,
using same model cpq ati1 tape drives
2 gig's mem
ext3 file systems
Same version of dump.
Same dump command line args

Machine #1: DUMP: Average transfer rate: 9920 kB/s
Dual 1.2ghz 
Raid 5 (3)18g 10k rpm drive config 5i controller
Rh 7.3

Machine #2: DUMP: Average transfer rate: 3928 kB/s
Dual 1.4ghz
Raid 0+1 (4)36g 15k rpm drive config 5i+ caching controller
CentOS 3.5

The machine I thought would have been faster,
is less than half the speed???

What should I be looking at to see if I can speed 
up the slower machine?