Fibre Channel (SAN)

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New Contributor
Posts: 3
Registered: ‎07-12-2016

QOS AE enabled negative impact on performance?

We currently have all ports on our fibre switches set to AE for QOS but we have no zones defined.  It looks to me like we would get better performance if we disabled QOS because from my understanding when you have AE ports and no zones defined all your traffic is given medium priority and is only able to use the medium assigned buffer credits. (https://www.ibm.com/developerworks/community/blogs/sanblog/entry/san_myths_uncovered_quality_of_service_in_brocade_fabricos2?lang=en).

As our Brocade 300's are  Dell badged I have had to go to Dell for support.  They have said "you can try disabling QOS on the ports".

I am looking for something more definite than that.  Can someone tell me if our current configuration be negatively impacting performance or if the AE port settings is something that can be ignored?

 

thank you

 

Joe

 

 

Frequent Contributor
Posts: 132
Registered: ‎02-05-2014

Re: QOS AE enabled negative impact on performance?

I wrote an entire article on that.

 

http://www.erwinvanlonden.net/2014/10/8-quality-of-service/

 

Sorry is for subscribers to the "Config Guide" only.

Kind regards,
Erwin van Londen
Former Brocade Distinguished Architect
http://www.erwinvanlonden.net The Fibre Channel blog


New Contributor
Posts: 3
Registered: ‎07-12-2016

Re: QOS AE enabled negative impact on performance?

Thanks for responding Erwin.  Unfortunately I don't have access to your article. Would you recommend we change the QOS on our ports from AE to OFF?

 

Joe

New Contributor
Posts: 3
Registered: ‎07-12-2016

Re: QOS AE enabled negative impact on performance?

Does anyone else have experience of this?  I think it would be fairly common not to configure QOS and to leave the ports at their default AE setting.

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