11-25-2015 08:30 AM
We have 8 backend paths from each of a set of switches to a flash array with Load Balancing on the Op/Sys.
3 of those backend paths on each switch report pcs_err counts around 1000. All other counters are 0 or very low.
I've searched and found nothing about this new counter field except that it is 16GB + only and is for the Physical Coding Sublayer.
So, I am wondering if these counts indicate a physical SAN problem or possibly a storage, switch or HBA configuration problem ?
11-25-2015 01:40 PM
11-26-2015 12:06 AM
as per my experience, the pcs_err refert to ITW = Invalid Transmission Word and can occur due a Incoding_in and Incoding_out Violations. Encoding violation occur only at 8G or lower, PCS Violation at 10G or higher speed.
11-26-2015 05:20 AM