Home » VMware » VCP550D » What can be done to ensure virtual machines at one site can be restarted at the remote site?
An administrator is configuring a stretched HA configuration and has HA errors on all of the hosts at the remote site.
What can be done to ensure virtual machines at one site can be restarted at the remote site?
A. Ensure any firewalls between the hosts are allowing port 8182
B. Create separate HA clusters at each site and enable Stretch Cluster on each
C. Ensure the latency between the sites is less than 5 milliseconds
D. Ensure each site has no more than 4 primary hosts
Correct Answer: C
Explanation/Reference:
Explanation:
A stretched HA cluster has the following requirements:
The sites must be closer than approximately 100 kilometers apart (due to latency requirements).
The sites must have a minimum of 622Mbps redundant network links.
The sites must have round-trip time latency of 5 milliseconds or less (10ms or less for vMotion if using vSphere Enterprise Plus licenses, 1ms or less for cross-site fault tolerance).
Incorrect Answers:
A: vSphere HA uses TCP and UDP port 8182 for agent-to-agent communication. However, the firewall ports open and close automatically to ensure they are open only when needed.
B: A stretched cluster is a vSphere Cluster that is configured with host located in different locations or sites.
D: A vSphere HA cluster has a single primary host known as a master host. This will apply to a stretched cluster as well as a stretched cluster is a vSphere Cluster that is configured with host located in different locations or sites.
References:
http://www.vmware.com/files/pdf/techpaper/Stretched_Clusters_and_VMware_vCenter_Site_Recovery_Manage_USLTR_Regalix.pdf
http://pubs.vmware.com/vsphere-50/index.jsp#com.vmware.vsphere.avail.doc_50/GUID-7442EF04-56C9-4910-ACBA-DF42E97ED311.html