Hi!
I'm putting up a small site and I'm having some performance issues that I hope someone can help me with.
This is a completely new setup. When creating the first VM on one of the two hosts, I didn't think it was very responsive and I started digging.
Installed a simple Ubuntu server VM. This is the only VM running on the host and the LUN I'm testing.
I'm currently using 2 vmkernel ports on a single vSwitch with 2 NICs for storage.
The disk configuration on the DX80 is:
- 6 disks in Raid-10 - Single LUN, owned by controller A
- 8 disks in Raid-10 - Single LUN, owned by controller B
I know dd is not a very good benchmarking tool, but it certainly generate IO. I get the same result on both LUNs; between 30-60MBps and high latency.
The write latency reported by vCenter is about 100ms. Esxtop reports GAVG/cmd between 70-90. Kernel Average is 0, so the host appears to be ok.
The network appears to be fine. The switches (2 x Cisco 3750G stacked) does not have any CRC or other errors. I'm not using jumbo frames at the moment. I disabled it to verify the configuration first.
Any suggestions?
Hardware:
Fujitsu RX300S6
- 2 x Xeon 6Core HT 3.066GHz
- 48GB memory
- 6 Intel Gbps NIC
Fujitsu DX80 S2 iSCSI
- 2 x iSCSI controllers, 4 ports
- 16 x 2.5" 10krpm 300GB SAS
Cisco 3750G
- 2 x 24 port Gigabit
- stacked