UCS Fiber Channel FI for San switch wiring & config

My question is about the correct wiring & vSAN configuration by the UCS FI switch San (Cisco MDS).

Currently my wiring is as follows:

Fi1 port 25 - SW1 port 3

Fi1 port 26 - SW2 port 3

Fi2 port 25 - SW1 port 4

Fi2 port 26 - SW2 4 port

On the side of the switch San, our guys of storage configured vlan10 SW1 and SW2 as vlan20. For this reason, I was not able to have a vSAN by FI, I read is recommended, because the VLAN switch cross FIs. Now, when I created vHBAs I have 4 vHBAs per server, 2 by IFS by vlan if I want redundancy with a switch or a loss of FI.

Question: Is this the correct configuration on the side of the SAN switch? Do I actually create 4 vHBAs per server? I do not have my incorrect wiring & I should just be linking FI1 to SW1 on two ports & FI2 to SW2?

Help or advice would be appreciated!

~ Tara

Hi Tara,

There are two ways of wiring of your SAN infrastructure.  It boils down to a design decision. Traditionally the SAN admins prefer to keep their separate/isolated tissue.  In this design THAT MDS-1 only connect to FI - A and MDS-2 would connect only to the FI - B.

Another option is to connect each MDS at each END.  This gives each FI SAN fabric access and allows to create double VSANS (that exists on each FI) rather than separate them.

You don't need four vHBAs by UCS Server - some adapters support no more than two in any case.   What you do is create two vHBA by the Service profile, each host will have access both to VSAN 10 and 20.  What you can do is to shift your tissue of vHBA while 1/2 access your Service VSAN 10 via FI - profiles and the other half access VSAN 10 FI - B.  This will help to distribute the load accordingly.

E.g.

First 1/2 of SPs

vHBA0 - VSAN10 - fabric-A

vHBA1 - VSAN20 - fabric-B

1/2 second of SPs

vHBA0 - VSAN20 - fabric-A

vHBA1 - VSAN10 - fabric-B

As you can see a bit of a manual balancing can act.  The best scenario would be to isolate (re-cable) to your network SAN fabrics according to the traditional SAN design above.

Kind regards

Robert

Tags: Cisco DataCenter

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