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the disk is offline because of policy set by an administrator

setting a vmdk to online and initializing

A new disk (vmdk) added to Windows Server 2008 R2 shows “unallocated” and “Offline” in Disk Management.


Prerequisite: Administrator or Domain Administrator
Begin by checking value of default SAN policy in CMD:
SAN Policy : Offline Shared

If “Offline Shared”, right-click the word “offline” for the specific disk, in the Disk Management interface. Select “Online” and then initialize the disk as on a physical server.


Typical steps in building a virtualized EPM environment on Windows Server 2008 R2 on VMWare ESXi 5 includes adding disks. Some examples are:

  • Moving the AD domain database and its log locations off C:\
  • Creating a separate disk from the OS for the EPM system installation

By default the new vmdk will be set to “offline” making it inaccessible.
See the external link below for more detail, or open Disk Management diskmgmt.msc and follow the steps above.

external links

Additional thanks for the post: by @sysadm2010.

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