Destroy LUN when reattaching server - What can cause it?

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

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