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Vsphere 4.1 HA Cluster

Posted on 2011-03-21
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Last Modified: 2012-05-11
I have 4 ESX4i servers with shared iSCSI storage.

No HA cluster has been setup as yet & he servers are in production mode.

Can anyone see any problems with creating a HA cluster in the live enviroment?

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Question by:esitrepxe
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13 Comments
 
LVL 40

Expert Comment

by:coolsport00
ID: 35182483
Nope...as long as you meet the requirements for HA, specifically licensing.

~coolsport00
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LVL 40

Expert Comment

by:coolsport00
ID: 35182493
The availability guide should help you if needed:
http://www.vmware.com/pdf/vsphere4/r41/vsp_41_availability.pdf

~coolsport00
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LVL 10

Expert Comment

by:jramsier
ID: 35182519
It could.  But if you do some testing you should be fine.  

I would make sure you can ping each ESX server from the ESX servers.  Also make sure the ESX servers can ping servers that are located on other ESX servers.  

Since you have vSphere Server up it seems these steps might be unnecessary but they are double assurance that there will be no issues.
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Expert Comment

by:coolsport00
ID: 35182546
The main issue that users encounter is not 'downtime', but errors...specifically DNS errors. You need to make sure you have DNS set up properly. Here is a VMware KB that discusses 'troubleshooting HA':
http://kb.vmware.com/kb/1001596

~coolsport00
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Author Comment

by:esitrepxe
ID: 35182734
Thanks for the info

Any thoughts on any  best practice changes I should make to the default settings a cluster creates?
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Expert Comment

by:coolsport00
ID: 35182764
Hmm...well, the Guide I provided is what is suggested by VMware, of course, but any setting changes from the defaults would really be determined by your org requirements.

~coolsport00
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Expert Comment

by:jramsier
ID: 35182782
I would turn on VMware DRS as well as long as VMotion is setup correctly.  This will move servers when an ESX is overloaded.  

A nice feature is the Power Management (it will move VM;s and power off unused ESX's) but with iSCSI you have to watch out.  VMware does not take into play the iSCSI and you can overload your iSCSI bandwidth,
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Expert Comment

by:alreadyinuse
ID: 35186138
Do all of the ESX hosts have the same processors?
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LVL 1

Expert Comment

by:Rehman_itends
ID: 35197598
Hi,

Adding HA in live environment it will not effect anything,but if you make sure that all requirements of HA should be fulfilled,there is a document for this http://www.vmware.com/pdf/vsphere4/r41/vsp_41_availability.pdf
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Accepted Solution

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coolsport00 earned 1000 total points
ID: 35197610
That document was already provided by me above.

~coolsport00
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LVL 1

Expert Comment

by:fbmeit
ID: 35225834
Hi esitrepxe,

The default HA policy is set to "Host failures cluster tolerates" which is very conservative. This will affect the available (not reserved) resource capacity of your cluster. I believe that setting your policy to reserve a percentage of cluster resources is more appropriate in most situations; using the percentage policy make sure you also enable DRS since it takes care of resource fragmentation in case HA is initiated.

Also in order to avoid false isolation response it's a good practice to have a redundant service console (ESX)/management network (ESXi) since this is the network HA uses to exchange heartbeats. These are also the IPs other hosts will try to ping before declaring a host failed/isolated.
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Author Closing Comment

by:esitrepxe
ID: 35728485
Not a concise answer, pointing to standard doc's i had already looked at. I was asking for real world answers not just to be pointed to vmware manuals
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LVL 40

Expert Comment

by:coolsport00
ID: 35728540
"exitrepxe", your initial post didn't ask for 'real world answer', but regardless, the Guides provide the answer for that as those *are* best practices and what most org's implement. Regardless, being that I'm one who uses vSphere and an HA/DRS cluster, to answer that question specifically, yes, you obviously can create a cluster in a 'live' environment. Since you didn't explicitly ask for real world scenario, your grade of "C" shouldn't be warranted. When creating posts, make sure you ask specifically what you're wanting. That will help us provide the best answer to your question.

Regards,
~coolsport00
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