You can validate it yourself with minimal effort - RDP to the server and use the cluster administrator console (is this windows 2008 also, or 2003?). The administration of clusters had changed in windows 2008 and I'm not familiar with it yet.
What you want to do is validate that the drive has been added to the same resource group as SQL Server and that SQL Server is dependent upon that drive.
As for validating that the mount point is added to all nodes - you need to follow up with the SAN guys on that.
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Managing Transaction Logs