How to swap the powersupply source for Cisco and Brocade switches on a SAN environment-VMware


We have VMware infrastructure
3 ESX server  
1 San and
2 Brocade switches
2 Cisco core switch (LACP is configured)

Here Brocade Switch-A and Cisco Switch-A (doesn’t have a redundant power supply) and both the switches are connected to UPS- A
The UPS-A battery has become faulty not behaving well. Now planning replace the UPS-A with a new UPS.

If I pull out the power cord of Brocade Switch-A and Cisco Switch-A and connect to the new UPS
Will it be ok and will there be any downtime?

Or is there a better way of swapping the power supply for this unit.
Please advise and thanks
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
very much depends on your network design, and storage design.

Is this a FC SAN ?

do you have multipathing, and trunks created to reduce single points of failure ?

if you do , then there should be no downtime.

Without looking over some design and configuration, it's very difficult to make a guess!?

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lianne143Author Commented:
Hi Andrew

It is not FC SAN and it must be iSCSI
andyalderSaggar maker's framemakerCommented:
Actually it's pretty easy to guess that there would be no downtime given that the kit list is pretty standard for a small VMware FC attached cluster, but to be sure that guess was right you would have to verify all the paths first. Maybe you should see if the UPS has hotswap battery, that would mean there would be no power interruption anyway,

You added it is not FC after my post, but Brocade do not make Ethernet switches so it must be FC.
David Johnson, CD, MVPOwnerCommented:

If I pull out the power cord of Brocade Switch-A and Cisco Switch-A and connect to the new UPS
Will it be ok and will there be any downtime?

If the switches have no power source then they will obviously not be available on the network. So yes there will be downtime as the switches restart and relearn the paths. The downtime will only last a short period of time.
I would make sure that the are no unsaved configurations
andyalderSaggar maker's framemakerCommented:
There would be no downtime on the FC (Brocade) network if it is cabled up correctly as that would be dual-fabric.
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