Dell Unity: SSH connection may not be available when running the SP is failed over to the secondary SP. (Dell Correctable)

Summary: This article describes one solution for SSH connection failure after unplugging the cable connected to the management port and management IP failover occurs. Also, in this example, the connection is still available using the Unisphere UI. ...

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Symptoms

After a Management IP failover occurs, it is possible to connect to the Unisphere UI but not using SSH.

This behavior has been reported with Dell Unity OE 5.1.

When this event occurs, although SSH Protocol is enabled in the Unisphere UI, the menu shows the same state as when it is disabled.

Unisphere UI showing Enable SSH option

SSH Connection was not restored after trying to disable and enable SSH from the Unisphere UI.
 

Cause

This event is caused when a Race Condition occurs in an internal processing due to a timing problem in the code execution.

Resolution

Resolution:
The fix is in Unity OE 5.2.0.

Workaround:
A workaround exists, but interaction by Dell Support is required. Contact Dell Support and reference this KB number.

Additional Information

We can check the current status of SSH by following KB000022376 to connect to IPMI.
Dell Unity: Using the IPMI Tool on Unity Systems (User Correctable)

- When connecting to Dell Unity via IPMI, if there is a problem, the command result will be displayed as follows. 
# svc_view_services -c |grep -i ssh
(The result is not displayed.)
  
# svc_ssh -s
State: disabled
Checking for external sshd:                                           failed
or 
# svc_ssh -s
State: enabled
Checking for external sshd:                                           failed
- If there is no problem, the command result will look like this
  
# svc_view_services -c |grep -i ssh
 sshd_external  (ocf::heartbeat:CFRA):  Started sp(a or b)

# svc_ssh -s
State: enabled
Checking for external sshd:                                           done

Produse afectate

Dell EMC Unity, Dell Unity 300, Dell EMC Unity 300F, Dell EMC Unity 350F, Dell EMC Unity 400, Dell EMC Unity 400F, Dell EMC Unity 450F, Dell EMC Unity 500, Dell EMC Unity 500F, Dell EMC Unity 550F

Produse

Dell EMC Unity XT 380, Dell EMC Unity XT 380F, Dell EMC Unity XT 480, Dell EMC Unity XT 480F, Dell EMC Unity 600, Dell EMC Unity 600F, Dell EMC Unity 650F, Dell EMC Unity XT 680, Dell EMC Unity XT 680F, Dell EMC Unity XT 880, Dell EMC Unity XT 880F , Dell EMC Unity Family |Dell EMC Unity All Flash, Dell EMC Unity Family, Dell EMC Unity Hybrid, Dell EMC UnityVSA Professional Edition/Unity Cloud Edition ...
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Article Number: 000193337
Article Type: Solution
Ultima modificare: 30 Nov 2023
Version:  4
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