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Excessive latency after power outage

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fas-systems
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HW
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Applies to

  • FAS2750
  • ONTAP 9.7P3
  • Power outage

Issue

  • After a power outage which causes both nodes to reboot, excessive latency is seen on the system
  • High latency is coming from Cluster

Workload            ID    Latency    Network    Cluster       Data       Disk    QoS Max    QoS Min      NVRAM 
--------------- ------ ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- 
volume1          17347    36.05ms   106.00us    35.09ms   641.00us     5.09ms        0ms        0ms    25.00us 
volume2          20282    34.12ms    90.00us    33.41ms   420.00us     3.41ms        0ms        0ms    11.00us

  • One of the controller cluster ports shows multiple CRC and symbol error
-- interface  e0b  (0 hours, 10 minutes, 30 seconds) --

RECEIVE
 Total frames:      839k | Frames/second:    1332  | Total bytes:      3980m
 Bytes/second:     6318k | Total errors:    20924  | Errors/minute:    1993 
 Total discards:      0  | Discards/minute:     0  | Multi/broadcast:    50 
 Non-primary u/c:     0  | CRC errors:      20877  | Runt frames:         0 
 Fragment:            0  | Long frames:         0  | Jabber:             45 
 Length errors:       2  | No buffer:           0  | Xon:                 0 
 Xoff:                0  | Pause:               0  | Jumbo:             483k
 Noproto:             0  | Error symbol:      319  | Illegal symbol:     66 
 Bus overruns:        0  | Queue drops:         0  | LRO segments:      571k
 LRO bytes:        3925m | 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

 

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