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Former Member

Clustering Virtual Machines on a single Host...Pro's /Con's

Hi,

We are moving to a new VM environment runinng ESX 4 Update 1 on HP c7000 enclosure, 8 ESX Hosts.

Our exisiting Produciton systems are clustered MSCS / SQL Server.

What is the value in clustering two VM's on the same host? typical clustering was to provide HA if one physical machine failed...but in a VM environment both VM's are on the same host.

I know I need to provide HA for production and would like to hear your comments and experience.

thanks,

Ld

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4 Answers

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    Former Member
    May 17, 2010 at 09:00 PM

    Hi Linwood,

    I don't see much value of an MSCS cluster on two VMs on the same physical ESX host. This setup would only provide protection against OS and/or DB failure and not hardware failure. Since you have 8 ESX host is there a reason you would not put the VMs on different physical ESX hosts (anti-affinity rules to always keep the VMs on different physical hosts)? The below link is to a guide from VMware regarding MSCS options on ESX 4 / vSphere 4.

    http://www.vmware.com/pdf/vsphere4/r40_u1/vsp_40_u1_mscs.pdf

    Regards,

    Bill

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  • May 17, 2010 at 11:38 PM

    And just to add:

    Check

    Note 1374671 - High Availability in Virtual Environment on Windows

    Markus

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    Former Member
    May 18, 2010 at 01:25 PM

    ...and last but not least 😊

    [SAP Solutions on VMware vSphere: High Availability|http://www.vmware.com/resources/techresources/10031]

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    Former Member
    May 18, 2010 at 04:55 PM

    Thanks for the links and feedback.

    I think a very good solution is not to use MSCS...and use VMware HA or VMware FT (or both). Less complexity according to the doc "Sap Solutions on VMware".

    http://www.vmware.com/files/pdf/SAP_vsphere_high_availability.pdf

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