If there is not corruption on the LUN itself where metadata got lost, you should be able to rebuild the server and re-attach the LUN. It gets funky if you are using dynamic partitions but you should still be able to import it. If you are using basic partition then once you rebuild the server it’s just a matter of presenting the LUN and assigning a drive letter ( you might need to bring it online if it’s Win2k8/12)
I'm playing in the lab with a VNX 5300, and I'm going through a test scenario of my fiber attached Windows server blowing up and needing a rebuild. The basic idea is to rebuild the windows box, reconnect the SAN, and NOT lose data.  The specs are a Windows 2008 server connected via Fiber(direct, no switches) with (2) HBAs and MPIO.  The question is, in this type of scenario, what can cause the LUN to get destroyed(lose data) or is there best practice for reattaching a rebuilt server(or connecting a new server) to a SAN?    Thanks in advance, Jon
Destroy LUN when reattaching server - What can cause it?