Virtual machines with oscillating clusters RDM

People,

We have two clusters at two knots with all nodes running ESX3.5 U1. Clusters have different CPU types that prevent from VMotion between clusters. All nodes are attached CF and share storage on an EMC CLARiiON CX3-80. Currently VMFS data warehouses, which are for most of the OS disks, are shared by all clusters, but the RDM (data readers) are presented specifically to one or other of the clusters. We are planning a major reorganization of our infrastructure which means Exchange effectively clusters for the majority of our virtual machines. Is there a more effective way of migration that detach the RDM, cold, migrate virtual machines and adding the back ROW on the other side?

As you can tell my experience of internals VMware is currently quite limited, but I learn - as sometimes the hard way!

Kind regards

Paul Esson

Hi Paul:

Everyone here has some excellent suggestions. However, cold migrate a virtual machine that has the RDM will actually convert or clone the content of the ROW in a virtual disk. The original content of the RDM will be left intact, and the only way to avoid the conversion with a cold-migrate is to remove from the configuration of your virtual machine first ROW (as you mentioned). With the help of Storage Vmotion will only move the pointer of the RDM files and actually does nothing with the RDM themselves. You'd still have to place them in your storage array to another cluster.

See the following article for a bit more detail:

http://KB.VMware.com/selfservice/microsites/search.do?cmd=displayKC&docType=kc&externalId=1005241&sliceId=1&docTypeID=DT_KB_1_1&dialogID=42936094&StateID=0%200%2041484096

-Dave

Tags: VMware

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