Microsoft has released a KB article to avoid data loss occurring when a SCSI disk turns off in a Windows Server 2012-based failover cluster.


Consider the following scenario:

  • You deploy a Windows Server 2012-based failover cluster. The cluster contains two nodes (node A and node B).
  • A SCSI disk is used for the failover cluster. The disk is a shared disk and is accessible by both node A and node B.
  • Node A restarts or crashes. Then, the cluster fails over to node B.
  • Node A comes back online.
  • Node B is shut down and the cluster fails over to node A.
  • You write some data to the disk.
  • The disk turns off unexpectedly. For example, the device losses power.

In this scenario, the data that you write to the disk is lost.

  • This issue also occurs when the cluster contains more than two nodes.
  • This issue does not occur if the SCSI disk supports the SCSI Primary Commands – 4 (SPC-4) standard.

To resolve this issue, install update rollup 2903938.  It’s an update rollup, so update rollup rules apply – either test like nuts in a lab or wait a month before you approve/deploy it.

2 comments so far

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  1. Link “released” at beginning doesn’t work

    • Firefox copy/paste issue. Fixed, thanks.

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