[PaulClayton]

Hi,

Our configuration two VIOs(1.5.1).
Each VIO has two 2G 5773 fibre cards. We use SDDPCM MPIO drivers.
The back end disk is an EVA8000 with an IBM SVC inbetween. The whole fabric runs at 2Gb.
Test I have run are as follows.
Disk write test using VSCSI device to SAN on DLPAR - 16MByte/s
Disk write test using SAN attached disk on VIO - 27MByte/s
Disk write test using SAS attached local disk - 55MBytes/s.
Read are double.
This server is not yet active or in production.

I tested our old P5(1.6GHZ) CPU which is very busy and not optimally configured. 30Mbyte/s

I have check that the queue_depth parameter is identical, and set the various paramemters according to the best practices documents. The DLPAR is run 6.1 SP4.

Two issues appear here, that is that I am loosing about 45% across the hypervisor, and there appears to be an issue between the P6-SVC-EVA storage.
Any thoughts on where the problem could be.