ESX4, ESX4i and vSphere have been released recently to replace ESX3.5 and ESX3.5i and vCenter. The previous ESX35 kernel is similar to Linux AS4 kernel. The new ESX4 is similar to Linux AS5 kernel. I found the new virtual switches are from 1G to 10G.
The upgrade are fairly easy comparing to the upgrade from ESX2 to ESX3. However, there are still some compatible issues. For example, when I tried to use vSphere to manage the ESX35 host, some functions did not work properly. Also, I wrote some VI perl script codes in ESX35 environment, but they do not work properly in new setting.
The new ESX4 release focuses on the 64bit systems. So when I upgrade from ESX35 to ESX4 on my old machines, they are all failed.
I started testing the new release few days ago. I will some comments when I finish the testing.
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