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UPGRADE ESXi:

I checked the documentation again and it actually looks like is possible to upgrade a host which was previously installed with ESXi 3.5 by upgrading to ESXi 4 and then to ESXi 5. I never did this though, because in all cases the old hardware was not supported for the latest ESXi version.

Anyway, the issue is not related to the VMFS version, but rather to the partition layout. ESXi 3.5 created 2 bootbank partitions with 48GB each and with ESXi 4/5 this partition size has to be 250GB.

I'd say try the interactive CD upgrade, but make sure you have an up-to-date backup of your VMs.

UPGRADE VM's:

The option to upgrade the virtual hardware will only show up for VMs with older hardware versions. If you want to see how this looks like, create a dummy VM with HW version 4 by selecting "custom" in the installation wizard.

UPGRADE (general):

Except for the order of upgrading tools and HW version this sounds ok. First upgrade the tools to ensure the VM has the required drivers for the upgraded hardware.

André

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