San file copy issue

[wardsidjame]

We have an issue with our Dell 4110x SAN, (Esxi 4.1)

In VM Environment, 5 hosts all with plenty of ram processing etc, iscsi connections 2x10Gb, dual Cisco 4500x switches and Dell has dual controllers.

24x900 10k drives in RAID 6, iops calculated at 3800.

When copying a large file from one host to another there is a initial burst of speed followed by a complete drop off of speed followed by a burst and so on, this goes from 150mpps + to 0 and back every 2-3 seconds.

If I set the c drive local to the server the issue goes away, then put it back onto the SAN it starts again.

The system isn't operating at full capacity and there isn't anything that appears to be wrong when you take the SAN out of the equation.

We have VMware endpoint with Kaspersky on but this has been disabled and the issue persists.

 

Any ideas

[3s-gtech]

That's a nice sounding setup, on a crusty old version of ESXi. Have you got the upgrade planned? Can't say for sure if this will help, but will be worth doing. Any logs from the switches in between?

[wardsidjame]

Sorry that was a typo, its 5.1