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Setting up Storage for Clustering

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We have 3 Dell servers we are trying to put into a cluster, and a 4th machine will be added later (VM). My issue now is I do not know how to set up the storage on the machines PRIOR to creating the Cluster so that the disks will be recognized as usable by the cluster. Currently when I use Cluster Manager and hit storage>right click disks>add disk, I get an error saying "No disks suitable for cluster disks were found. For diagnostic info about disks available to the cluster, use the Validate a Configuration Wizard to run Storage Tests." 

So I checked the validation test and this is what I see (copy and pasted from validation test):

    No disks were found on which to perform cluster validation tests. To correct this, review the following possible causes:
    * The disks are already clustered and currently Online in the cluster. When testing a working cluster, ensure that the disks that you want to test are Offline in the cluster.
    * The disks are unsuitable for clustering. Boot volumes, system volumes, disks used for paging or dump files, etc., are examples of disks unsuitable for clustering.
    * Review the "List Disks" test. Ensure that the disks you want to test are unmasked, that is, your masking or zoning does not prevent access to the disks. If the disks seem to be unmasked or zoned correctly but could not be tested, try restarting the servers before running the validation tests again.
    * The cluster does not use shared storage. A cluster must use a hardware solution based either on shared storage or on replication between nodes. If your solution is based on replication between nodes, you do not need to rerun Storage tests. Instead, work with the provider of your replication solution to ensure that replicated copies of the cluster configuration database can be maintained across the nodes.
    * The disks are Online in the cluster and are in maintenance mode.
    No disks were found on which to perform cluster validation tests.


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