This is something that we do once in months so you might forget the process and then come across errors few time before recalling the right process at least this have happened with me more than twice so thought of making a note of the process of adding RDMs to already up and running MSCS cluster nodes.
Adding RDM to Microsoft Cluster nodes is little different from adding RDM LUN to an independent Virtual Machine.
The first part is same in both cases, you can add RDM disk while VM is powered on however in case of MSCS node one need to power off the VM before initiating the same on secondary node.
Open VM Settings => Click on Add Hardware, Select Hard disk => select Disk type as RAW device mapping =>now this the screen you can select the intended LUN,
On next screen Select, where you want to store the RDM pointer files, Next => on this screen you would select the RDM compatibility, it could be Physical or Virtual (description of both is available in screenshot), Select Physical
On next screen you would select controller => then you would see summary here, click finish and you are done.
Again go to the fist node's VM settings and select the newly added RDM drive and copy/right down the path of RDM Pointer file, do the same for any other RDM...
Now power off the node if its not already powered off(if this was the primary node, cluster resources would automatically move to another available node or move the resources to secondary node manually and power off the VM).
If you wouldn't power off the first node and try to add the rdm to secondary VM, you will get following error,
And if you power off the secondary node then you would able to add the RDMs to it however when you would try to power it on, you will end up with this error,
So if you are not already aware you would wonder, what;s the right way to do that. Here it is:
Power off the node where you have already added the RDM LUNs(if not already) and Now Add the RDMs to the Secondary Node while its a active cluster host and online.
Open VM Settings => Click on Add Hardware, Select Hard disk => now this the screen you need to select add an existing disk
On next screen you would select controller => then you would see summary , click finish and you are done.
That's it... :)
Adding RDM to Microsoft Cluster nodes is little different from adding RDM LUN to an independent Virtual Machine.
The first part is same in both cases, you can add RDM disk while VM is powered on however in case of MSCS node one need to power off the VM before initiating the same on secondary node.
Open VM Settings => Click on Add Hardware, Select Hard disk => select Disk type as RAW device mapping =>now this the screen you can select the intended LUN,
Again go to the fist node's VM settings and select the newly added RDM drive and copy/right down the path of RDM Pointer file, do the same for any other RDM...
Now power off the node if its not already powered off(if this was the primary node, cluster resources would automatically move to another available node or move the resources to secondary node manually and power off the VM).
If you wouldn't power off the first node and try to add the rdm to secondary VM, you will get following error,
Power off the node where you have already added the RDM LUNs(if not already) and Now Add the RDMs to the Secondary Node while its a active cluster host and online.
Open VM Settings => Click on Add Hardware, Select Hard disk => now this the screen you need to select add an existing disk
On Next screen you need to provide/browse the path earlier noted/copied RDM Pointer file,
On next screen you would select controller => then you would see summary , click finish and you are done.
That's it... :)
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