[openib-general] IB and FC

[Mohit Katiyar, Noida]

Hi all,
Sorry previous mail got scrapped due to HTML pictures andsecond due to
tabs so  I hope this reaches correctly
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 ------ |                  |-------I/O storage
           |  Gateway      |                  |
Client ----|   Router      |----- 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