05-24-2012 08:18 PM
I have a 24 port 8Gb SAN switch.
To get the best performance out of the switch I would like to connect the storage array to port 0,4,8 and 12.
Does anybody know how the ASIC's are allocated (wired)?
Or is it better to make an offset of 8 ?
05-24-2012 08:39 PM
Thanks for the quick answer,
yeah I am using a Brocade 300.
How can I understand that?
Each port has its own ASIC?
Or are all 24 ports sharing a single ASIC.
So in general, it wouldn't make sense to share the load over different ASIC boundaries?
What I try to explain is: It's not important if I connect the storage array into port 0,1,2,3?
05-24-2012 08:55 PM
So it's not important if, I connect the storage array into port 0,1,2,3?
The reason why I ask this is, an Engineer from HP told me to connect the storage array into port 0,8,15,22.
He told me this is better for performance and high availability.
05-24-2012 09:09 PM
Port Groups, 0-7; 8-15; and 16-23; called Octet are relevant by Trunking, because the Trunking feature can be bounded only betwen the same Octet.
--->>>an Engineer from HP told me to connect the storage array into port 0,8,15,22.
Port 0, is in Octet Group 1;
Port 8 and 15 are in Octet Group 2;
Port 22 is in Octet Group 3;
ask this HP Engineer, what is the difference instead to connect Array to Port "22" maybe to another Port 16-23 ?
and why get a better Performance when Array is connected to Port 8 and 15 ?
05-24-2012 09:27 PM
--->>> Of course I'll ask the guy.
I would be curious about the argumentation from HP.
--->>> Port 23 is used for ISL. Maybe this is the reason.
change nothing in such case if Port 23 or xy is used for ISL
such an Argumentation like this from HP Engineer make sense by Multi ASIC, e.g. Blade based switches, see attached ASIC layout.
as you can see, in such case 8G 32 Port Blade is based on TWO ASIC,
Port 0-7; 16-23; are Assigned to ASIC 0
Port 8-15; 24-31 are assigned to ASIC 1
05-30-2012 04:14 AM
If you reach the storage array from hosts connected to other switches over an ISL, maybe he wanted to avoid a situation like this:
Beside of that I'm not aware of any other effects that would influence the decision.
I would just connect it at random ports. 0, 8, 15, 22 sounds good