Skip to main content
NetApp Knowledge Base

Persistent false SinglePathToDiskShelf_Alert after shelf added

Views:
1,354
Visibility:
Public
Votes:
1
Category:
disk-shelves
Specialty:
hw
Last Updated:

Applies to

  • Storage shelf expansion
  • Correct SAS cabling 
  • HA pair in MultiPath

Issue

  • SinglePathToDiskShelf alert example: 
::> system health alert show
Node: node_name
Resource: Shelf 1.1
Severity: Major
Indication Time: Wed May 11 21:14:22 2022
Suppress: false
Acknowledge: false
Probable Cause: Controller node_name has only a single-path configuration to disk shelf 1.1. This might occur
when the controller does not have dual-path configuration to stack 1, a SAS HBA port on the
controller connected to the disk shelf is disabled, or shelf-to-shelf cabling is incorrect.
Possible Effect: Access to disk shelf 1.1 via controller node_name might be lost with a failure of controller 0a port, a
single shelf-to-shelf cable or a single disk shelf IOM.
Corrective Actions: 1. Consult the guide applicable to your IOM12 disk shelf to review cabling rules and complete the SAS cabling worksheet for your system.
2. Connect controller node_name to the first and last disk shelf of stack 1 using active SAS HBA ports.
3. Verify that controller node_name is cabled to IOM A at one end and IOM B at another end of stack 1.
4. If disk shelf 1.1 is located between two disk shelves within stack 2, verify that IOM A and IOM B are properly cabled to their independent domains.
5. Contact technical support if the alert persists.
  • Temporary EMS alert messages:
Tue May 17 20:08:01 +0200 [node_name: mgwd: callhome.hm.alert.major:alert]: Call home for Health Monitor process nchm: SinglePathToDiskShelf_Alert[12345678912345678912].
Tue May 17 20:09:31 +0200 [node_name: schmd: hm.alert.raised:alert]: Alert Id = DualControllerHa_Alert , Alerting Resource = 0a:0b:0c:0d:0e:0f:00:0a raised by monitor system-connect
Tue May 17 20:13:01 +0200 [node_name: mgwd: callhome.hm.alert.major:alert]: Call home for Health Monitor process schm: DualControllerHa_Alert[0a:0b:0c:0d:0e:0f:00:0a].
Tue May 17 20:24:31 +0200 [node_name: schmd: hm.alert.cleared:notice]: Alert Id = DualControllerHa_Alert , Alerting Resource = 50:0a:09:80:0e:97:15:80 cleared by monitor system-connect

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.