Tag Archives: mscs

Virtualizing MSCS 2012R2 on vSphere

I was working lately to Virtualize MSCS 2012R2 clusters on vSphere.

According to this kb, it is officially supported on vSphere 5.5 update 1.

I have been spending some time on it and, but for some reason the cluster validation kept failing because of “disk arbitration” test problems.

After contacting all vendors (VMware, HDS, Microsoft) i found out, there is a bug that is related to active-active arrays (in my case VSP) that causes the validation to fail.

If you use any kind of ALUA array, you are bug free, and should be able to implement this.

This bug is handled at the moment by vmware engineering and a fix should be released soon.

UPDATE: this kb popped up , that explains the situation. No solution yet.

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MSCS on vSphere unknown

I have been doing clustering on vsphere  for a while now, but this configuration has eluded me.

VM’s that are part of MSCS lock their RDM’s in a way that ESXi’s cant discover them during boot time.

That causes the boot time to extend because the ESXi tries to discover each LUN until it times out.

But, there is a solution for that, you can configure the LUN’s used for MSCS as perennially reserved, so the ESX’i knows not to try to discover them.

Also, there is a kb for that.

So, dont forget this part of building MSCS on vSphere, it can extend the boot time to several hours.

Hope someone can use it.

 

 

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