Isolation process difference in 4.1 and 5.1

Need to understand isolation process difference in 4.x and 5.x..

How actually Isolation Ping start/configured in 4.1 and 5.1 ?
use of HA advanced option: das.isolationaddress
and how Isolation address assigned/configured and work during fail over?
major ha difference in 4.1 and 5.1 like any time difference during fail over to be started ?
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patronAsked:
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
You are correct there are differences between 4.x and 5.x, normally you would use the defaults, unless you have  a specific requirement, where you do not have a default gateway, or it's not reliable.

The Default out of the box is your default gateway, and some organisations add a second address.

see here

http://www.yellow-bricks.com/2012/05/25/use-dasisolationaddressx/

The differences are complex, and are fully listed in the following links for your to compare

You can read all about it at this link

Advanced Configuration options for VMware High Availability for pre-5.0 (1006421)

Advanced configuration options for VMware High Availability in vSphere 5.x (2033250)
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AbhilashBloggerCommented:
Also in 4.1 it used to check only for network isolation and declare the host is isolated. Now with 5.x it also checks for datastore heartbeat.
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patronAuthor Commented:
DAS.ISOLATIONADDRESS 192.168.1.1 [ICMP ALLOWED FOR 192.168.1.1 AND 2 ONLY] is this the config required to test for customized isolation address,as other ips are with icmp blocked?
how can we verify if this is rightly configured for customized isolation address?
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
login to the host, and check you can ping the IP Address
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patronAuthor Commented:
yes,i am able to ping that ip before/after config!!

how can we make sure if i have given 2 entries like das.isolationaddress | 192.168.1.31 and
das.isolationaddress | 192.168.1.34 [able to ping form host]

if it fine with required config to be done on Cluster for customized isolation address ?
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
if you can ping the addresses you have defined the configuration will work.

if you want to test failover, you will have to disocnnect from the network.
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patronAuthor Commented:
Thanks.
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