Why the interconnections of fabric can be connected to the two MDS?

Hi all

1. why the white paper below says that if FI is connected to two MDS, then it will create a single point of failure?

http://www.Cisco.com/c/en/us/products/collateral/storage-networking/MDS-9500-series-multilayer-directors/white_paper_c11_586100.html

This image below is used to describe the scenario for question 2 to 4.

2 and why the SAN design best practices to create SAN A and SAN B? Where when the switch 1 has failed, then it will use the b in SAN. And in this case, user can configure to connect to the storage using SAN B first, instead of using SAN first? And by default, the behavior of the SAN like that, what I mean is that she will check SAN failed, then it will use SAN B?

3. and why there is no connection between the left more server and switch 2? They can not who design when switch 1 has failed, then it will use the other link first to switch 2, by linking the left more server for 2? Then when the core SAN switch one down, he uses the SAN B connection.

4. can you the server to different SAN multipath? In this case, SAN A and B.

Thank you

Osbin

Hi Osbin,

Why the white paper below says that if FI is connected to two MDS, then it will create a single point of failure?

Protocol FC build tissue, using the FSPF (such as OSPF) of the Protocol in order to MDS, FI (switch mode) Nexus 5 k, 7 k (storage VDC) form a single fabric using the links intercommutation.

If a problem is occur in tissue alone device's problem (zoning, FSPF, EENT)

If you connect fabric and fabric B (connect a FI for switch 1 and switch 2) in other words, this is no fabric A and B - it became a unique fabric (fabric single = single point of failure). That's why we use two FI, connected to two independent fabrics (isolation and redundancy)

Technically, you can avoid this problem by using VSANS, but if some problem in a NX - OS or SAN - OS occure you may lose the two fabrics in a single failure (the worst of the world SAN)

2 and why the SAN design best practices to create SAN A and SAN B? Where when the switch 1 has failed, then it will use the b in SAN. And in this case, user can configure to connect to the storage using SAN B first, instead of using SAN first? And by default, the behavior of the SAN like that, what I mean is that she will check SAN failed, then it will use SAN B?

Point main initiator is in the answer above, can use both at the same time (multipath) fabrics with special drivers.

It is configurable by the user to use any fabric (A and B - is just for engineers) first.

It depends on the OS and drivers.

3. and why there is no connection between the left more server and switch 2?

I believe that this picture is schematic diagram and imagine if you have enough ports in the switch 1

They can not who design when switch 1 has failed, then it will use the other link first to switch 2, by linking the left more server for 2?

Remember the idea of FC fabric. If you spend 1 it will affect every single switch fabric, and it is much faster to use stable fabric B instead of A fabric converging.

Then when the core SAN switch one down, he uses the SAN B connection.

4. can you the server to different SAN multipath? In this case, SAN A and B.

Yes

Best regards

Alex

Tags: Cisco DataCenter

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