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VMWare - Upload speed 1Gb/sec, download speed 100mb/sec

I doubt anybody will be able to answer this for me, but it is worth a shot.

EsXi 5 on an HP Proliant G5.

Two ports from two physical network adapters - one Intel, one HP linked to a single vSwitch. The VMKernel port is on this VSwitch.

If I pull data from the server - to any of the three datastores, speeds do not go greater than 40-50mbit/sec. However, if I pull data from the server, I can get speeds of 200-300mbit/sec easily.

The network adapters and the switches (redundant Cisco 4506's) are both set to 1000 full. I have tried putting one adapter into standby (in VMWare), then the other adapter into standby, but the problem persists. So I know it is not a problem with the NIC's themselves. That also kind of eliminates the switches at the cause of the problem.

Any ideas?

ASKER CERTIFIED SOLUTION

Andrew Hancock (VMware vExpert PRO / EE Fellow/British Beekeeper)

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City of Nashua

ASKER

Interesting...I will look into this. Is there a way to tell if the BB write cache is installed under VMWare? I do not see anything about it via the ILO information menu, and with ESXi as the operating system I cannot run the HP ADU utility.

Edit: OK, I opened the server up - the battery backed write cache module slots are missing, so I am going to say that this server does not have one.

compdigit44

What type of storage are you using? Local, SAN etc.. Also, are you transferring data over iSCSI or FC?

City of Nashua

ASKER

Found the problem. The battery backup cache controller...does not have a battery attached to it. Apparently in HP controllers this can cause very severe write delays. Thank you for your assistance.