We got an new iSCSI SAN (HP Lefthand P4500) running on 10 Gbps.
Server HW HP Prolinat DL 380 Gt with 2 CPUs Intel X5660 and 96 GB ram, HP NC550SFP dual Port Lan adaptor. All Server and Networking componnents ar certfied for Windows and VMWARE.
We made a performance Test with an Windows 2008 R2 as OS and SW iSCSI initiator. Then we made the same Test wit excatly the same HW, running one Windows 2008 R2 as a virtuall maschine on vsphere 4.1 (build 348481) it.
To compare the perfornace, we used Intel Iomeeter SW with 64k blocks read and write
The Results are frustrating
Windows 2008 R2 running directliy on the Hardware
read: 662 MB/sec
write: 430 MB/sec
one Windows 2008 R2 running on VMWARE 4.1 as a VM
read: 100 MB/sec
write; 157 MB/sec
one Windows 2008 R2 running on VMWARE 4.1 using MS windows iscsi
read: 71 MB/sec
write: 122 MB/sec
I don't understand
. why is writing faste then reading
- why is it so much slower than on a HW server
since datatransfer is more than 1 Gbps, could it be that vmware is not able to handle 10 Gbps
What can we do to enhence the performance?