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The Cluster Mailbox Server Prerequisites test may fail when installing Exchange Server 2007 on a Windows Server 2003 cluster node.� During the Exchange Server 2007 setup process, a check will be performed on the volume selected for hosting the mailbox, to ensure that the volume is a clustered resource.� This is accomplished by sending IOCTL_VOLUME_IS_CLUSTERED.� In the failure case, the IOCTL will fail to recognize the volume as a clustered resource.� A error similar to the following will be logged in the Exchange setup log:
[ERROR] The storage path 'R:\Mailbox' for a single copy cluster must be a clustered disk. Please specify a different path for the shared storage.
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This issue is caused by a race condition in the cluster disk driver, where it will fail to attach to the volume stack intermittently.
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In testing, it has been found that you may be able to work around the issue by restarting, removing MPIO (if installed), or by shutting down all but one cluster node.
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