SAN

Mike Kramer on November 17th, 2011

Having problems using diskpart in Windows 7 or Windows 2008?

Do you get errors such as “Disk is offline because of policy set by administrator” or “media is write protected” when trying to create partitions in Windows, especially for SAN storage volumes or LUNs?

Have no fear, there are easy fixes for both. These usually occur on SAN disks presented to Windows servers, either physical or virtual.

Issuing the following commands will solve both problems per incident. Below that I posted an option to avoid the offline disk problem on each server for the future by changing the policy per server.

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Mike Kramer on September 11th, 2010

A new way to expand a VMFS Datastore: Expand a LUN on the SAN to the desired size (up to 2 TB), then expanding the VMFS datastore from your VSphere Client.

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Mike Kramer on March 2nd, 2010

VMWare’s VMFS 3 allows adding extents on the fly, and from either a separate LUN on a SAN or from extra space within a LUN that was expanded or migrated to a larger LUN.  However, because it is possible doesn’t mean it should be done.  There are 2 accepted ways to increase the size of [...]

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