SAN Terminology Question

We have a SAN using a Dell/EMC CX500 and CX300. I took the Dell training a
while back but now I am going over the books. I ran across this statement:

"Fibre Channel data transfers are fast, delivering up to 2 Gb/sec with a
single loop; rates of up to 400 MB/sec are possible with dual-loop
configurations."

I remember the instructor saying that too. I don't understand how with two
HBAs it is not 4 Gb/sec instead of 400 MB/sec. Isn't 4 Gb/sec faster then
400 MB/sec? Just need a little clarity.

Thanks for any and all help.


Clayton

Clayton Sutton wrote:
We have a SAN using a Dell/EMC CX500 and CX300. I took the Dell training a
while back but now I am going over the books. I ran across this statement:

"Fibre Channel data transfers are fast, delivering up to 2 Gb/sec with a
single loop; rates of up to 400 MB/sec are possible with dual-loop
configurations."

I remember the instructor saying that too. I don't understand how with two
HBAs it is not 4 Gb/sec instead of 400 MB/sec. Isn't 4 Gb/sec faster then
400 MB/sec? Just need a little clarity.


2Gb/s FC is about 200MB/s. Bits vs. bytes, watch the capitals. In any
event, FC uses 8b/10b encoding, so you get one byte out of each 10 raw
"bits."

"Clayton Sutton" wrote in message
.. .

I remember the instructor saying that too. I don't understand how with
two HBAs it is not 4 Gb/sec instead of 400 MB/sec. Isn't 4 Gb/sec faster
then 400 MB/sec? Just need a little clarity.


It's actually the same. 4Gb/s is 4 GigaBIT serial signalling speed. This
transfers 400 MegaBYTE of data per second.

Rob

Thnaks guys,

I think I got it now.


Clayton



"Clayton Sutton" wrote in message
.. .
We have a SAN using a Dell/EMC CX500 and CX300. I took the Dell training
a while back but now I am going over the books. I ran across this
statement:

"Fibre Channel data transfers are fast, delivering up to 2 Gb/sec with a
single loop; rates of up to 400 MB/sec are possible with dual-loop
configurations."

I remember the instructor saying that too. I don't understand how with
two HBAs it is not 4 Gb/sec instead of 400 MB/sec. Isn't 4 Gb/sec faster
then 400 MB/sec? Just need a little clarity.

Thanks for any and all help.


Clayton

Thx


Clayton



"Clayton Sutton" wrote in message
...
Thnaks guys,

I think I got it now.


Clayton



"Clayton Sutton" wrote in message
.. .
We have a SAN using a Dell/EMC CX500 and CX300. I took the Dell training
a while back but now I am going over the books. I ran across this
statement:

"Fibre Channel data transfers are fast, delivering up to 2 Gb/sec with a
single loop; rates of up to 400 MB/sec are possible with dual-loop
configurations."

I remember the instructor saying that too. I don't understand how with
two HBAs it is not 4 Gb/sec instead of 400 MB/sec. Isn't 4 Gb/sec faster
then 400 MB/sec? Just need a little clarity.

Thanks for any and all help.


Clayton