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NoPathToNSMB_Alert after adding shelves to an existing config

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Applies to

  • AFF A900, AFF A800, AFF A700, AFF A400, AFF A320
  • New NS224 shelves added and working properly, following best practices for cabling 
  • Storage configuration change from directly-attached storage to switch-attached storage
  • Cisco Nexus 3232C or 9336C-FX2 switch

Issue

  • Health alert for both NSMA and NSMB modules

Monitor                 node-connect
Alert ID                NoPathToNSMA_Alert
Alerting Resource       01234567890123456789
Subsystem               SAS-connect
Indication Time         Sun May 08 21:34:51 2022
Perceived Severity      Major
AutoSupport Triggered   true
Probable Cause          Cable_tamper
Corrective Actions   1. Consult the guide applicable to your NVMe storage shelf to review cabling rules for your system.
                     2. Connect controller amsnapc01n01 to module A and module B of shelf 1.2.

  • The alerts are raised and cleared periodically: 

::> event log show -event hm.alert*
Time                Node      Severity   Event
------------------- --------  --------   ---------------------------
4/22/2022 16:12:01  node_name-1   NOTICE     hm.alert.cleared: Alert Id = NoPathToNSMB_Alert , Alerting Resource = 01234567890123456789 cleared by monitor node-connect
4/22/2022 15:42:00  node_name-2   ALERT      hm.alert.raised: Alert Id = NoPathToNSMB_Alert , Alerting Resource = 01234567890123456789 raised by monitor node-connect

  • Repeated EMS messages:

...
[node_name-1: nchmd: hm.alert.cleared:notice]: Alert Id = NoPathToNSMB_Alert , Alerting Resource = 01234567890123456789 cleared by monitor node-connect
[node_name-1: nchmd: hm.alert.cleared:notice]: Alert Id = NoPathToNSMB_Alert , Alerting Resource = 01234567890123456789 cleared by monitor node-connect
[node_name-1: nchmd: hm.alert.raised:alert]: Alert Id = NoPathToNSMB_Alert , Alerting Resource = 01234567890123456789 raised by monitor node-connect
[node_name-1: nchmd: hm.alert.raised:alert]: Alert Id = NoPathToNSMB_Alert , Alerting Resource = 01234567890123456789 raised by monitor node-connect

...
[node_name-2: nchmd: hm.alert.cleared:notice]: Alert Id = NoPathToNSMB_Alert , Alerting Resource = 01234567890123456789 cleared by monitor node-connect
[node_name-2: nchmd: hm.alert.raised:alert]: Alert Id = NoPathToNSMB_Alert , Alerting Resource = 01234567890123456789 raised by monitor node-connect
[node_name-2: nchmd: hm.alert.cleared:notice]: Alert Id = NoPathToNSMB_Alert , Alerting Resource = 01234567890123456789 cleared by monitor node-connect
[node_name-2: nchmd: hm.alert.raised:alert]: Alert Id = NoPathToNSMB_Alert , Alerting Resource = 01234567890123456789 raised by monitor node-connect

  • No storage switches listed in system switch ethernet show output.

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