We are looking at moving our ESXi 5.5 hosts to a new stack of switches.
Right now, we have 4 hosts connected with a minimum of 2 physical NIC's each to our storage network. On our storage network, we have 2 Nimble arrays with 5 iSCSI connections each. I was wanting to try to move these servers and storage arrays to the new switches without downtime if possible.
My plan was to take a couple NIC's from the SAN's and connect them to the new switch, then run through the esxi hosts pulling 1-2 NIC's from each server and connecting them to the new SAN one at a time. Then once that is done, removing the rest of the NIC's on the old switch and move them to the new switch.
Essentially walking off the cables 1 by 1.
When I pull the cable on a NIC that has active I/O traffic on it, will the failover to a secondary NIC be relatively seamless, or are we looking at the possiblity of a little disruption while traffic fails over to another NIC.
Our hosts are setup so that we have iSCSI vswitch 1 with VMNIC0, iSCSI vswitch2 with VMNIC 1, iSCSI vswitch 3 with VMNIC 2 etc etc. Then all of those are setup on the software iSCSI adapter as active adapters for failover.
Would this be possible, is there a better way to move to a new switch live, or would my best be to bite the bullet and get some downtime scheduled to do this move.