[openib-general] IB and FC

[Mohit Katiyar, Noida]

Hi all,
Sorry previous mail got scrapped due to HTML pictures so  now with text
pictures
I just cant clear a doubt about IB.
In the first figure given below the max speed that can be obtained
between the client and the IO storage is 2Gb/s

Client --------|
Client --------|			|--- FC Switch---|
  .		   | 			|		     |
  .		   |---FC Cables--|		     |-----I/O storage
  .		   |	Each client	|	           |
Client --------|	connected	|--- FC Switch---|
			To both switch


                                       Figure 1

 

While in the figure given below the client to IB FC gateway speed is >
10 GB/s and from Gateway to I/O storage is 2GB/s and if port aggregation
is applied at gateway then 4GB/s. So the total effective speed from
client to I/O storage can max be reached at 4GB/s

	   IB cables  
Client --------|
Client --------|				     |----- FC
Switch---|						
  .		   |	IB cables  		     |
|				
  .		   |------------IB FC ------ |	            |---FC
Cables------I/O storage
  .		   |		  Gateway/Router |
|	
Client --------|				     |----- FC
Switch---|	


                                                Figure 2

 

So can anyone explain me am I correct in my approach? Are there any
other advantages in shifting from figure 1 architecture to figure 2
architecture?

It does not seem any advantageous in shifting from FC SAN to IB FC SAN
through such a pattern?

Can anyone help me in deciding about this??

 

 

 

Thanks in advance

 

Mohit Katiyar