We are using a Cisco Catalyst 3110X in a IBM Blade Centre
Uplink to a Nexus 5010.
The Uplinks are 10GB using the Cisco X2-10Gb-SR modules.
When we are doing large transfers (such as server builds) from the Netapp Filers to the Blade Servers we are getting dropped frames on the output queue of the 1GB Interfaces connecting to the Blade Servers. We are using Jumbo Frames.
It appears that the 1GB Interfaces are receiving more traffic than they can handle. Unfortunately the 3110X doesn't have any shaping ability (WRR is not supported for Jumbo Frames) we can police traffic but we can't rate-limit and shape. The Nexus also is the same no shaping.
Has anyone else come across this issue or have suggestions on how to reduce the number of frames dropping as the result severely degraded performance.
When we copy data to the Filers we get:
47mbps 1GB - > 10GB with Jumbo Frames
68mbps 1GB -> 10GB with MTU set to 1500
4.2mbps 10GB - > 1GB with Jumbo Frames
50mbps 10GB -> 1GB with MTU set to 1500