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August, 2008

Shadow VMs on Site Recovery Manager

Occasionally when implementing SRM we get asked about the Shadow VMs created in the recovery site.  What are they for?  How much space do they require?  Where should they be stored?  Shadow VMs are actually very simple.  They are place holders for the VMs in the protected site.  They consist of three very small files containing configuration and meta-data for their respective VM.  The total size for all three files is just a few KBs.  Therefore, even if you protected the current limit of 500 virtual machines with SRM the total size would not be concerning.  The files should be stored on a volume that is accessible by all servers in the recovery site and that volume can be just a few GB in size.  There is no reason to replicate this volume to any other site as it is only used locally in the recovery site.

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