high availability, clusters, replication etc

Can you give some pointers on what should be checked around vsphere clusters, HA, replication? I.e. some specific checks for risk assurance? And ideas on what can go wrong?
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pma111Asked:
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
VMware HA does not function correctly.

1. Check DNS resolution, forward and reverse DNS lookups work.

2. You can ping your isolation address. (e.g. default gateway)

Risks - Not Test VMware HA, does not failover correctly.

See here for troubleshooting, this is a massive subject....

Troubleshooting VMware High Availability (HA) in vSphere
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amarchandkCommented:
5.0 onwards HA has no dependency on DNS.
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