Your CPU utilization profile does not match mine so, I do not know if I can
help.

We have a P660-6H1 identically configured, except I use Shark Disk and
Magstar tape using FC and the Ethernet is Gigabit.  The only time I see high
CPU utlization is during backups coming down the ethernet.  At about
70MB/sec it pegs the system.  A copy of a diskpool to tape or tape to tape
takes about 3% of the system.  We currently have 12 FC drives on the systems
and have never seen it over 35% utlization during no backups coming in, but
CPU usage is linear on the arrival of IP packets.

Our disk pool is about 512GB we copy about 7TB a day, because we create an
onsite and offsite copy.  We backup about 850GB a day from around 150
clients (AIX, NT, W2K, SGI, Solaris Clients).  We have a lot of data that
will be moved to SAN tape soon that will relieve the Gigabit.  We are adding
2 more FC cards (will be 6 then for tape coping).

Do not know what to say.  I am getting about twice the amount through the
system with the same configuration except. GIGABIT and FC disk and tape.

Paul D. Seay, Jr.
Technical Specialist
Naptheon, INC
757-688-8180