Archive for August, 2011

OSM Ratio’s on MDS blades

Author: brian

Aug 24

Recently the topic came up on the Cisco Learning Network on OSM ratio’s for the 18/4 module.  Here is a summary of many of the ratios for various modules as well as some handy notes:

Generation 2 Switches and Modules

9216 does not support Gen-2 modules

If dedicated ports are not using all of their allocated bandwidth, the unused bandwidth is made available for use by all ports configured for shared bandwidth mode.

Performance Buffers are used on 12-port 4GB, 4-port 10GB modules only.

Port Groups

Module Ports Per Group Bandwidth Per Group Max BW Per Port Dedicated Shared
DS-X9148 12 12.8 4GB Yes Yes
DS-X9124 6 12.8 4GB Yes Yes
DS-X9304-18K9 6 12.8 4GB Yes Yes
DS-X9112 3 12.8 4GB Yes No
DS-X9704 1 10 10GB Yes No
DS-C9134-K9 4 16 4GB Yes Yes
1 10 10GB Yes No
DS-C9124-K9 4 16 4GB Yes No
DS-C9222i-K9 6 12.8 4GB Yes Yes

 

48-port Module 4:1 – 5:1
BB Credit Allocation Type BB Credit Per Module Dedicated (2-250) Shared (2-16)
ISL Fx ISL Fx
User Defined BB 6000 125 16 16 16

 

24-port Module 2:1 – 4:1
BB Credit Allocation Type BB Credit Per Module Dedicated (2-250) Shared (2-16)
ISL Fx ISL Fx
User Defined BB 6000 250 16 16 16

 

18-port Module 2:1 – 4:1
BB Credit Allocation Type BB Credit Per Module Dedicated (2-250) Shared (2-16)
ISL Fx ISL Fx
User Defined BB 4509 250 16 16 16

 

12-port Module 1:1
BB Credit Allocation Type BB Credit Per Module Dedicated (2-250)
ISL Fx
User Defined BB 5488 250 16
Performance 512 (shared) 145 12

 

With regards to the 12-port module:

There are 2488 extra buffers available as extended BB_credit buffers after allocating all the default BB_credit buffers for all the ports in ISL mode (5488 – (250 * 12)).

Extended BB_credits are allocated across all ports on the switch. That is, they are not allocated by port group.

4-port Module 1:1
BB Credit Allocation Type BB Credit Per Module Dedicated (2-250)
ISL Fx
User Defined BB 5488 250 16
Performance 512 (shared) 145 12

With regards to the 4-port module:

The ports in the 4-port 10-Gbps switching module only support 10-Gbps dedicated rate mode. FL port mode and shared rate mode are not supported.

There are 4488 extra buffers available as extended BB_credits after allocating all the default BB_credit buffers for all the ports in ISL mode (5488 – (250 * 4)).

9134 Switch
BB Credit Allocation Type BB Credit Per Port Group BB Credit Per Port Defaults (2-250)
ISL Fx
User Defined BB 64 16 16

 

9124 Switch
BB Credit Allocation Type BB Credit Per Port Group BB Credit Per Port Defaults (2-250)
ISL Fx
User Defined BB 64 16 16

 

9222i Switch
BB Credit Allocation Type BB Credit Per Port Group BB Credit Per Port Defaults (2-250)
ISL Fx
User Defined BB 4509 250 16
  • 5 Comments
  • Filed under: CCIE Storage, Generation-2 Modules, MDS

    • The Company You Keep

    Author: brian

    Aug 3

    THE COMPANY YOU KEEP
    (Anonymous)
    IT IS BETTER TO BE ALONE, THAN IN THE WRONG COMPANY
                    Tell me who your best friends are, and I will tell you who you are. If you run with wolves, you will learn to howl. But, if you associate with eagles, you will learn how to soar to great heights. “A mirror reflects a man’s face, but what he is really like is shown by the kind of friends he chooses.” The simple but true fact of life is that you become like those with whom you closely associate — for the good and the bad.
                The less you associate with some people, the more your life will improve. Any time you tolerate mediocrity in others, it increases your mediocrity. An important attribute in successful people is their impatience with negative thinking and negative acting people. As you grow, your associates will change. You will make new friends. Some of your friends will not want you to go on. They will want you to stay where they are. Friends that don’t help you climb will want you to crawl. Your friends will stretch your vision or choke your dreams. Those that don’t increase you will eventually decrease you.
    Consider this:
    ·         Never receive counsel from unproductive people.
    ·         Never discuss your problems with someone incapable of contributing to the solution, because those who never succeed themselves are always the first to tell you how. Not everyone has a right to speak into your life. You are certain to get the worst of the bargain when you exchange ideas with the wrong person.
    ·         Don’t follow anyone who’s not going anywhere. Remember, with some people you spend an evening, with other you invest it.
    ·         If you ask someone who is going nowhere fast where to go or what to do, guess where you will be going —nowhere, and guess what you will be doing—nothing.
    ·         Be careful where you stop to inquire for directions along the road of life.
    ·         Wise is the person who fortifies his life with the right friendships.
  • 2 Comments
  • Filed under: Uncategorized