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NVMe I/O timeouts and SCSI errors in NS224 shelf

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Applies to

NS224 shelves

Issue

  • Latency issues in Consistency Points and SCSI errors detected from Virtual Machines hosts.
  • EMS messages with timeouts: 
Thu Dec 03 20:51:03 CET [node_name: intr: nvmeof.timeout:notice]: Timeout on subnqn nqn.2014-08.org.nvmexpress.discovery, controller ID 5, qpair ID 0, sequence number 45417.
Thu Dec 03 20:51:03 CET [node_name: intr: nvmeof.rdma.disconnect.status:notice]: NVMe-oF disconnect on subnqn nqn.2014-08.org.nvmexpress.discovery, controller ID 5, qpair ID 0.
  • NVMe high counters, in ifstat outputs, for controller to shelf port(s).

-- interface  e0c  (53 days, 23 hours, 58 minutes, 41 seconds) --
      RECEIVE
       Total frames:    11625k | Frames/second:       2  | Total bytes:      5312m
       Bytes/second:     1139  | Total errors:        0  | Errors/minute:       0
       Total discards:   1789k | Discards/minute:    23  | Multi/broadcast:  4969k
       Non-primary u/c:     0  | CRC errors:          0  | Runt frames:         0
       Fragment:            0  | Long frames:         0  | Jabber:              0
       Length errors:       0  | Alignment errors:    0  | No buffer:           0
       Pause:               0  | Jumbo:           25792m | Error symbol:        0
       Bus overruns:     1789k | Queue drops:         0  | LRO segments:        0
       LRO bytes:           0  | LRO6 segments:    6520k | LRO6 bytes:       4178m
       Bad UDP cksum:       0  | Bad UDP6 cksum:      0  | Bad TCP cksum:       0
       Bad TCP6 cksum:      0  | Mcast v6 solicit: 1552k
      TRANSMIT
       Total frames:    10504k | Frames/second:       2  | Total bytes:      1081m
       Bytes/second:      232  | Total errors:        0  | Errors/minute:       0
       Total discards:      0  | Queue overflow:      0  | Multi/broadcast:  3259k
       Pause:             471k | Jumbo:           29818m | Cfg Up to Downs:     2
       TSO segments:        0  | TSO bytes:           0  | TSO6 segments:       0
       TSO6 bytes:          0  | HW UDP cksums:       0  | HW UDP6 cksums:   3104k

 

 

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