Microsoft Cluster in vSphere using RDM disks

Gentlemen, I have doubts that sounds simple, but it is better to ask than to the hurt things.

Here, in the company where I started work two weeks ago. We have two servers of files Windows Server 2012, both are part of Microsoft Cluster Services, these two servers are virtualized on VMware ESXi 5.5, each on a host, here we use vCenter HA and DRS.

Well, these file servers 03 RDM disks connected to the fibre channel, storage only disks are online only on node 1, node 2 drives are present in the computer Manager, but marked offline.

To my knowledge, my experience of simple Microsoft cluster, the disks must be online on all nodes for disaster recovery is quick, for example through cluster in Windows Server 2008 R2 and Hyper-V Server R2 of 2012 using iSCSI storage and always leave the disks online on all nodes.

My question is: is there a reason why a node drives remain online and the other node is taken offline? Because of RDM technology?

I can then do disks on node 2 as well as online without risk?

I'm an environment that left another analyst configured, had never made Windows Server 2012 in virtualized VMware vSphere servers cluster using RDM disks, so made the questions, so instead of simply in clicking on node 2 of disks and makes them online it is better to ask before

Thank you!

Ivanildo, is the normal Windows Server Failover Clustering behavior, since it is an active/passive cluster architecture, where a single node read/write a disk at a time, and is not a problem due to the use of RDMS in vSphere environment.

The bellow image show two discs a WSFC, where 6 disk Offline on that particular node and the 7 disc is online:

And, do TRY not to put the disks as offline being online on another node through disk management, this task must be performed by using the Failover Cluster Management console.

Tags: VMware

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