troubleshooting Question

ESX3.5 to ESX4.1 questions

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col_a_274 asked on
Virtualization
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My company has asked me to look at upgrading our ESX infrastructure and have been asked to look at certain areas the hosts are ESX3.5 and are running in VC2.5 and these require to upgraded to ESX4.1 and VC4.1, I have checked the hardware and it is compatible for with ESX4.1 so that is not an issue however I have a few questions:

1. is it possible to migrate data from VC2.5 to 4.1 if so is the a best practices for doing this?

2. I have been asked to look at these areas and would like to know how best to tackle them      
VM & LUN ratio/placement?
CPU/memory resource allocation?
Define & apply ESX host firmware baseline?
Root password & usage?
Hardware alerting including HP SIM integration?

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