Network Isolation and Host Isolation

[Ranjna Aggarwal]

What is the difference between network isolation and host isolation?

[vGuy]

I guess there is no difference when discussing HA...both the terms are being used synonymously.

in networking terms, network isolation may also refer to an internal only vSwitch or a physically separated network.

[rickardnobel]

Ranjna Aggarwal wrote:

What is the difference between network isolation and host isolation?

Perhaps "network isolation" is another way to speak about a network partition?

[VirtuallyMikeB]

Good day!

What I'm going to assume you're speaking of is the difference between a network partition and host isolation in vSphere 5.  This information is covered nicely in Epping and Denneman's VMware vSphere 5 Clustering Technical Deepdive.  I've referenced the following parts from the book.

...a host is considered to be either Isolated or Partitioned when it loses network access to a master but has not failed.

<> Isolated

     - Is not receiving heartbeats from the master

     - Is not receiving any election traffic

     - Cannot ping the isolation address [usually the default gateway]

<> Partitioned

     - Is not receiving heartbeats from the master

     - *Is* receiving election traffic (emphasis mine)

     - (at some point a new master will be elected at which the state will be reported to vCenter)

Anybody that's elbows deep in vSphere should read this book, by the way.

Cheers,

Mike Brown

http://VirtuallyMikeBrown.com

https://twitter.com/#!/VirtuallyMikeB

http://LinkedIn.com/in/michaelbbrown

[Duncan Epping]

Google would have returned:

http://www.yellow-bricks.com/vmware-high-availability-deepdiv/#HA-50isolated

[Ranjna Aggarwal]

In Official Course book it's written as 2 separate topics. Check the attached pic please.

[Duncan Epping]

Yes, and the point is?

[Ranjna Aggarwal]

The Point is i am agree with you that both are same but why this is written as two separate concepts in the book?

[Duncan Epping]

I don't know... everyone makes mistakes right.

Those two "network isolation" and "network partition", should have been straight under "host isolation".

[Ranjna Aggarwal]

Ok....Thanks....So that's mistake in the book

[rickardnobel]

Ranjna Aggarwal wrote:

Ok....Thanks....So that's mistake in the book

Unfortunately there are a couple in the ICM course.