Simple mapping of RDM vs file several mapping of RDM files?

Hello

When you configure Microsoft Cluster nodes in a scenario of cluster-across-boxes (stream clustering) (two ESXi hosts, two-node cluster MSCS, with a bow on each ESXi host), I realize that using physical RDM Mode (pass-through RDM) is the way to go.  I also usually have to locate the C: drive (zero eager thick) for each cluster node on another volume VMFS to ensure two distinct areas of failure.  So, for example the C: drive of node of Cluster 1 (VM1) could be the Datastore1 and the C: drive of Cluster 2 node (VM2) might be on Datastore2.  Similarly, I always created RDM mapping files for each virtual computer as well, pointing to the same raw LUN.  For example, I would put the mapping of RDM for the quorum shared LUN on Datastore1 for VM1 and file a new mapping file RDM pointing to the same conditions of quorum LUN on Datastore2 for VM2.  In this way, the failure of Datastore1 will affect only VM1 and VM2affect only the failure of Datastore2 .  I did this for years (probably since ESX 2.5) and MSCS works very well in this configuration.

However, I was re-reading of the official documentation of "configuration of Failover Clustering and the Microsoft Cluster Service" VMware and noticed that specific VMware at several locations as "a map file of RDM single and shared for each clustered disk is necessary."  In other words, they call for me to select 'existing hard drive' VM2, and then tap the RDM mapping file that I created on VM1, rather than creating a new fresh RDM for VM2 mapping file.  This seems to be "less safe" because the failure of Datastore1, or RDM 1 mapping file corruption, would result in the failure of VM2.  A separate mapping RDM for VM2, on a separate data store file would provide two distinct areas fault to two virtual machines.

Does anyone know why VMware requires a shared single RDM mapping file?  Are there specific problems, caused by the presence of two separate files RDM mapping?

Thank you

Bill

It seems that VMware has posted a KB that explicitly indicates that a pointer/mapping "single" RDM file must be used on all nodes of the cluster.  So I guess this settles my question!

Several files of RDM pointer after the migration of storage (2131011)

http://KB.VMware.com/kb/2131011

Bill

Tags: VMware

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