Fibre Channel (SAN)

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New Contributor
Posts: 3
Registered: ‎03-21-2013

DS5300 Buffer Credits,

Hello:

We are experiencing a lot of time spent with the buffer credits hitting 0. On average for of our ISL ports are hitting 0 between 30 and 50% of the time. The buffers are set to the default 16, would increasing the number of credits help our issue. I know there will be many questions on this thread back to me about the current setup and I will do my best to answer them. I am new to this environment so I will do my best.

Valued Contributor
Posts: 761
Registered: ‎06-11-2010

Re: DS5300 Buffer Credits,

Hi,

What's the current config in the ISLs?

New Contributor
Posts: 3
Registered: ‎03-21-2013

Re: DS5300 Buffer Credits,

How would I go about getting the current config on the ISL ports?

Contributor
Posts: 57
Registered: ‎08-12-2009

Re: DS5300 Buffer Credits,

portbuffershow will display allocated bb credits. There are a lot of reasons why credits will continually hit 0. This could range from long distance settings incorrect for actual distance, poor SAN design, non-recommended oversubscription of ISL's or high latency / slow drain devices in the network.

Valued Contributor
Posts: 761
Registered: ‎06-11-2010

Re: DS5300 Buffer Credits,

the amount of BB credits could be different in both ends of the ISL, that depends on the settings configured and the type of ASIC and switch.

I agree with . To check the config you can run portcfgshow <port> and the amount of BB credits with portbuffershow <port>

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