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Why would there be excessive usage (90% on ethernet switch port) coming from ports e0a or e0b ?

Why would there be excessive usage (90% on ethernet switch port) coming from ports e0a or e0b on a mirrored set of v3240s (OnTap 8.2.3P4 7-Mode)?

 

We have SANs in two buildings. One is production, the other a backup site using Snapmirrors.

 

Our network guys noticed and traced the 90% usage to the e0a or e0b ports on the SAN.

 

All of our data is accessed via fibre-channel, and I use the SP ports for management.

 

Thanks in advance.

 

Gregg

 

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