HA Response Types – Host Isolation – Vmware KB
Host Isolation can be a troubling thing in the Enterprise Virtual Data Center. As we have been moving forward with ESX we have noticed some of these things happening from time to time. Somewhere in the beginning we forgot to do homework and find that when we run into Host Isolation that it almost always means some VM’s are down and unresponsive. Understanding how H/A is different from DRS and vMotion is sometimes important to know. Today I read a VMware KB that described HA response times in the case of a Host Isolation response. I recall going through this in our fast track class and learned how to avoid this from happening.
The Best Practice “Rule of Thumb”:
When configuring and setting up your enterprise its important to know the little things that go on to help you avoid potential downtime. Currently Host Isolation pretty much means that you have Zero control over your VM while the Host is flagged as being Isolated. There are a couple of ways to avoid this by setting manual thresholds for isolation response times before claiming the host is actually isolated or by doubling the redundancy of your management network heartbeat as well. This could come back and tell you what exactly you are having a problem with. I have seen host isolation responses occur due to storage connectivity and even if the network goes down or some other configuration that was missed and now you have no redundancy. Setting manual thresholds is important to avoid that worst case scenarios. Below is the quick way of fixing these things without having to do any manual advanced options. The KB listed this as well here: VMware KB: VMware High Availability host isolation resp…
HA Response Types
I particularly like after page 21 in this document in the above line. Have a good read and Merry Christmas!
***Disclaimer: The thoughts and views expressed on VirtualNoob.wordpress.org and Chad King in no way reflect the views or thoughts of his employer or any other views of a company. These are his personal opinions which are formed on his own. Also, products improve over time and some things maybe out of date. Please feel free to contact us and request an update and we will be happy to assist. Thanks!~