Provisioning bare metal Windows servers could be tricky, but here you can find step-by-step instructions (with a workflow) explaining how to do it on UCS and EMC VNX FCoE storage.
For your convenience, a sample WinPE.wim file with embedded UCS drivers and WinPE PowerShell packages is available here: WinPE.zip - Box
If your setup is based on NetApp iSCSI storage, you should take a look at this post https://communities.cisco.com/docs/DOC-75028
