I am having an issue with our MD3000i and VMware ESXi 4.1. After speaking to a Dell tech I got this email last night:
......
I have discussed the issue with one of our senior analysts; he agrees
that a compatibility issue between the ESX or VMFS versions might cause
these symptoms. He also indicated that as yet ESX 4.1 has not been
validated with the MD3000i, and that communication issues are possible.
For this reason I would not recommend updating any more servers to that
version at this time. A future update to the array firmware is expected
to resolve any incompatibility between ESX 4.1 and the storage array.
.......