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NFS access slowness due to the incremental bus overruns and discards count

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232
Visibility:
Public
Votes:
0
Category:
ontap-9
Specialty:
nas
Last Updated:

Applies to

  • ONTAP 9
  • NFS

Issue

  • NFS client gets severe slowness to access export volumes.
  • The slowness disappears after moving the data interface to the partner node
  • ifstat shows a high amount of bus overrun and discards counts on the port
-- interface  e0c  (339 days, 13 hours, 40 minutes, 23 seconds) --

RECEIVE
 Total frames:      120g | Frames/second:    4124  | Total bytes:       365t
 Bytes/second:    12450k | Total errors:        2  | Errors/minute:       0 
 Total discards:  21080k | Discards/minute:    43  | Multi/broadcast: 23896k
 Non-primary u/c:     0  | CRC errors:          0  | Runt frames:         0 
 Fragment:            0  | Long frames:         0  | Jabber:              2 
 Length errors:       0  | No buffer:           0  | Xon:                 0 
 Xoff:                0  | Pause:               0  | Jumbo:           42929m
 Noproto:             0  | Error symbol:       27  | Illegal symbol:      1 
 Bus overruns:    21080k | Queue drops:         0  | LRO segments:    60391m
 LRO bytes:         360t | 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:    1  | Lagg errors:         0 
 Lacp errors:         0  | Lacp PDU errors:     0 
TRANSMIT
 Total frames:      127g | Frames/second:    4337  | Total bytes:       745t
 Bytes/second:    25411k | Total errors:        0  | Errors/minute:       0 
 Total discards:      0  | Queue overflow:      0  | Multi/broadcast:  1568k
 Collisions:          0  | Xon:                 0  | Xoff:                0 
 Pause:               0  | Jumbo:           44549m | Cfg Up to Downs:     4 
 TSO non-TCP drop:    0  | Split hdr drop:      0  | Timeout:             0 
 TSO segments:    17931m | TSO bytes:         555t | TSO6 segments:       0 
 TSO6 bytes:          0  | HW UDP cksums:      12  | HW UDP6 cksums:      0 
 HW TCP cksums:   69589m | HW TCP6 cksums:      0  | Mcast v6 solicit:    0 
 Lagg drops:          0  | Lagg no buffer:      0  | Lagg no entries:     0 
DEVICE
 Mcast addresses:     3  | Rx MBuf Sz:       4096 
LINK INFO
 Speed:           10000M | Duplex:            full | Flowcontrol:       none
 Media state:     active | Up to downs:          8

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