I have an interesting issue where I am seeing high output queue drops between two servers on the same VLAN.
Servers are 1Gb attached and speed/duplex has been verified. The servers run around 40-50Mb/s and then burst up to 150-300Mb/s. It is during these bursts that I am seeing very high (in the 1000/10000's) of output queue drops.
I see these bursts both on the port connected to the server itself, as well as on the Port-Channel interfaces between the two 6509's.
mls qos is enabled, and TAC recommended disabling this; due to other services on the switch this is not an option and not one I think should be 'encouraged' to solve an issue.
The two servers are on two seperate 6509's, both connected via 6748-GE-TX. The traffic itself is traversing a 4Gb/s port-channel. Both the port-channel and the destination server port show very high rates of output drops during bursts of traffic.
Any suggestions or other information I could provide that could help diagnose this issue.
Everything from Cisco seems to suggest this being a simple link congestion issue, but we've seen time and time again that the links are simply not congested, and are only running at 20-30% of line rate.