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how actually host isolation works ?

any difference in 4.x and 5.x ?
how actually it works  ?
how master slave is decided and changed during host isolation ?
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patron
Asked:
patron
1 Solution
 
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
In simple terms, it's done by hosts communicating with each other (the Agent on each host), sending heartbeats via the network every 15 seconds.

Host isolation occurs, when it cannot communicate with any other hosts in the HA Cluster.
This is a long and complicated subject

I would start reading the King of DRS and HA - here

The differences between, 4.1, 5.0 and 5.5 are highlighted, also Master and Slave is discussed.

I would recommend any VMware Admin, purchase the HA Deep Dive books.

http://www.yellow-bricks.com/vmware-high-availability-deepdiv/

VMware vSphere 4.1 HA and DRS Technical deepdive (Volume 1)

By Duncan Epping and Frank Denneman

(http://www.yellow-bricks.com/vmware-high-availability-deepdiv/)

ISBN-10: 1456301446
ISBN-13: 978-1456301446

Written by Duncan Epping and Frank Denneman, both of whom are Consulting Architects at VMware and are perceived by the industry as Subject Matter experts on VMware High Availability and VMware Distributed Resource Scheduler.
This book zooms in on two key components of every VMware based infrastructure. It covers the basic steps needed to create a VMware HA and DRS cluster, and goes on to explain the concepts and mechanisms behind HA and DRS which will enable you to make well educated decisions. You will get the tools to understand and implement e.g. HA admission control policies, DRS resource pools and resource allocation settings and more.

On Amazon US

[Paperback]

http://www.amazon.com/gp/product/1456301446?ie=UTF8&tag=yellowbricks20&linkCode=as2&camp=1789&creative=9325&creativeASIN=1456301446

[ebook]

http://www.amazon.com/dp/B004V49JGW/ref=as_li_tf_til?tag=yellowbricks20&camp=0&creative=0&linkCode=as1&creativeASIN=B004V49JGW&adid=0ED4RKK85G6ZTGTH9ENP

on Amazon UK


[Paperback]

http://www.amazon.co.uk/Vmware-Vsphere-4-1-Technical-Deepdive/dp/1456301446/ref=sr_1_2ie=UTF8&s=books&qid=1305637596&sr=8-2


[ebook]

http://www.amazon.co.uk/VMware-vSphere-4-1-technical-deepdive/dp/B004V49JGW/ref=sr_1_1?ie=UTF8&s=digitaltext&qid=1305637596&sr=8-1

Available in Europe from

http://www.comcol.nl/detail/73133.htm
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patronAuthor Commented:
Great Stuff.Thanks
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