Skip to main content
NetApp Knowledge Base

NAS access slow or hung caused by CRC errors on network port

  1. Last updated
  2. Save as PDF
Views:
311
Visibility:
Public
Votes:
0
Category:
ontap-9
Specialty:
perf
Last Updated:

Applies to

  • ONTAP 9
  • NFS

Issue

  • Observed slow data transfer and high read latency every time application is run
  • QOS statistics volume latency command slows little latency
  • NFS client report below error and hang:

kernel: nfs: server 10.xx.xx.xx not responding, still trying 

  • Packet trace (from client or storage) may show retransmit and out of order packets
  • Check for network errors
    • From the filer you can check ports with the below command
      • >>: node run -node node1 -command "ifstat-a" for the affected ports
    • Engage network team to review connected switch ports as well
  • cluster::> system node run -node "nodename" -command ifstat -a

-- interface  e4a  (2 days, 10 hours, 22 minutes, 35 seconds) --
 
RECEIVE
 Total frames:     5161m | Frames/second:   24558  | Total bytes:      5152g
 Bytes/second:    24516k | Total errors:    35927  | Errors/minute:      10 
 Total discards:      0  | Discards/minute:     0  | Multi/broadcast: 26826k
 Non-primary u/c:     0  | CRC errors:      35927  | Runt frames:         0 
 Fragment:            0  | Long frames:         0  | Jabber:              0 
 Length errors:       0  | No buffer:           0  | Xon:                 0 
 Xoff:                0  | Pause:               0  | Jumbo:             218k
 Noproto:             0  | Error symbol:        0  | Illegal symbol:      0 
 Bus overruns:        0  | Queue drops:         0  | LRO segments:     2060m
 LRO bytes:        4909g | LRO6 segments:       0  | LRO6 bytes:          0 
 Bad UDP cksum:       0  | Bad UDP6 cksum:      0  | Bad TCP cksum:       0 
 Bad TCP6 cksum:      0  | Mcast v6 solicit:    0  | Lagg errors:         0 
 Lacp errors:         0  | Lacp PDU errors:     0
  • CRC errors indicate a receive side data issue
  • CRCs result in packet loss due to re-transmissions and out-of-order packets received.

Sign in to view the entire content of this KB article.

New to NetApp?

Learn more about our award-winning Support

NetApp provides no representations or warranties regarding the accuracy or reliability or serviceability of any information or recommendations provided in this publication or with respect to any results that may be obtained by the use of the information or observance of any recommendations provided herein. The information in this document is distributed AS IS and the use of this information or the implementation of any recommendations or techniques herein is a customer's responsibility and depends on the customer's ability to evaluate and integrate them into the customer's operational environment. This document and the information contained herein may be used solely in connection with the NetApp products discussed in this document.