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Scope of the issue
Troubleshooting ESX host storage issues begins with identifying how far reaching (the scope) the problem is. In many cases, a detected problem may be misidentified until the scope has been ascertained.
Identify the scope of your issue below:
Storage Device is viewable by a subset of ESX Server Cluster.
A single host cannot see the Shared Storage.
LUN is presented and is available.
ESX Server cannot see the Datastore.
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Assistance Steps
Scope of the issue