Scenario: You connect your Windows or Hyper-V system to a FiberChannel or iSCSI target device that supports multi-path I/O (MPIO). When you view Disk Management, it shows up twice (or more). You can bring one online, but any others show “Offline (The disk is offline because it has a redundant path with another device)”.
The basic issue is that multipath I/O needs to be configured at the Windows level. If you have specialized software from your hardware vendor, use that first. They will often enable and configure the necessary Windows components for you.
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