We have two domains with B series UCS servers. Recently I’ve been upgrading and fixing various issues. While working with Cisco TAC, we had to bring down one of our Fabric Interconnects and when that was done, all storage communication stopped. Our first thought was that the hosts weren’t configured correctly network wise but as soon as I triggered a rescan, all my ESXi hosts immediately started talking to the VMs again
I’m not sure what’s going on but with two FIs and no redundancy, it’s kinda silly.. so here’s a quick breakdown.
Two iSCSI networks on different subnets
If one FI goes down, storage communication is lost until a rescan is triggered
No networking on either iSCSI network fails
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