Hello community,
I've got a question to the following infrastructure: ESX 4.1 U1 on a HP ProLiant DL380G5 with the DLink DSN 2100 10 in iSCSI mode. The SAN is configured to present 3 LUNs to the ESX. The SAN itself has 8 x 1TB physical S-ATA disks running in RAID10 (configured by a third-party IT-Service provider). The physical connection between ESX and SAN is realised through 3x 1GBit/s with VLAN seperated Links. ESX is configured with multipathing and round robin to talk with the SAN.
Whats my problem? My problem is the write-performance of the SAN! It's incredibly low (at about 10 MegaBYTE per second, round about 100MegaBIT/s). Read performance is very good, about 100 MegaBYTE/s / 1Gigabit/s)!
It doesn't matter if I copy a file from VM to VM or just provision a new VM using vSphere Client. The write-performance is very bad!
Can someone confirm that or has any other ideas? I'm beyond my ken with this issue!
The last steps I did (it didn't worked before too): configure LACP / static Links on SAN side and on ESX, configured multi-pathing with all three available NIC's. Changed path-policy to Round-Robin. Any suggestions?
Hope you can help me.
Julian