We have 2 Nexus 5010 switches (SW-A and SW-B) and two Nexus 2148T fabric extenders (FEX-A and FEX-B). Currently FEX-A is connected to SW-A and FEX-B to SW-B. The intent is to have almost every server or storage device dual-homed to a FEX on a different Nexus 5000 switch for path redundancy.
I've been looking through "Cisco Nexus 2000 Series Fabric Extender Software Configuration Guide, Release 4.1", specifically the "Upgrading the Fabric Extender in a vPC Topology" section on pages 21-22 to try to find out what happens if a FEX is dual-homed to multiple switches.
I understand that if one or more FEXs are connected to a single switch, that when the firmware on that switch is upgraded, all attached FEXs will reboot along with the switch. What I can't clearly determine is if I dual-home both FEX's to both Nexus 5010 switches, is it possible to upgrade/reboot one switch at a time without rebooting all the FEX's at once. If dual-homing FEX's means taht all FEX's would reboot at the same time, that sort of defeats the point of multiple network paths to the attached servers.