How to prevent VMware single point failure

Most of our clients with VMware infrastructure. We never heard anything going/went wrong with that infrastructure other than in-house tech ask us ,How to do ?  What to do ? etc . In my past two years, i have not seen a failure/down time. They have been running without  a single point failure.
I was asked to document for DR. I have no idea what can go wrong !. Experts out there, Can you please list me few things can go wrong with VMware and bring the infrastructure down. Of course ,core switch can bring entire network down , but it is not VMware admin job.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
1. SAN failure (hardware fault)
2. UPS or Generator failure (all hosts and SAN down)
3. PSU failure in Hosts (but I'm sure you've got redundant PSUs?)
4. Network failure (but I;m sure you have redundant nics)
5. Switch failure for storage
6. Switch failure for networks

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sara2000Author Commented:
We have enterprise SAN, more unlikely will go wrong. No signlepoint failure in switches, PSU, NICs,UPS and air conditioners.They all have fault tolerance.
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
We have enterprise SAN, more unlikely will go wrong.

how much would you like to bet ?

That's what a local authority said, when it was down for 3 DAYS!
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