Check these out:
- VSA Resilience [Failed Node] - http://blogs.vmware.com/vsphere/2011/08/vsphere-storage-appliance-part-2-resilience.html
- VSA Resilience [Back-End Network] – http://blogs.vmware.com/vsphere/2011/09/vsphere-storage-appliance-vsa-network-outage-scenario-1-back-end.html
- VSA Resilience [Front-End Network] – http://blogs.vmware.com/vsphere/2011/09/vsphere-storage-appliance-vsa-resilience-network-outage-scenario-2-front-end.html
HTH
Cormac