PowerFlex Cannot add a standby node to an MDM cluster

Summary: Cannot add standby node to the MDM cluster.

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Symptoms

When trying to replace a Slave MDM node with a standby node, getting the following error in the events log:

22892 2017-10-03 07:50:21.908 CLI_COMMAND_FAILED        WARNING          Command REPLACE_CLUSTER_MDM was not successful. Error code: The MDM could not be found [3982]

The command used was:

#scli --replace_cluster_mdm --add_slave_mdm_name Manager2 --remove_slave_mdm_name Manager3 --allow_leave_failed --i_am_sure

Where query all would look like:

#scli --query_cluster
Cluster:
    Name: SIO: 3_node, State: Normal, Active: 3/3, Replicas: 2/2
Master MDM:
   Name: Manager1 ID: 0x123456789
        IPs: X.X.Y.X, X.X.Y.X, Management IPs: X.X.X.X, Port: 9011
        Version: 2.0.5014
Slave MDMs:
    Name: Manager3, ID: 0x987654321
        IPs: X.X.Y.X, X.X.Y.X, Management IPs: X.X.X.X
        Status: Normal, Version: 2.0.5014
Tie-Breakers:
    Name: TB1, ID: 0x213546789
        IPs: X.X.X.X, X.X.X.X, Port: 9011
        Status: Normal, Version: 2.0.5014
Standby MDMs:
    Name: Manager2, ID: 0x2455547834b33141, Manager
        IPs: X.X.X.X, X.X.X.X, Management IPs: X.X.X.X, Port: 9011
    Name: TB, ID: 0x123457689, Tie Breaker
        IPs: X.XX.X, x.x.x.x, Port: 9011

 

Cause

There was no MDM package installed on the standby node.

Resolution

Remove the standby node:

#scli --remove_standby_mdm --remove_mdm_name Manager2

Install the MDM package on the standby mode - for svm: 

#MDM_ROLE_IS_MANAGER=1 rpm -i < package >

Add the standby node back to the cluster:

#scli --add_standby_mdm --mdm_role manager --new_mdm_ip x.x.x.x,x.x.x.x --new_mdm_name Manager2 --new_mdm_management_ip x.x.x.x

Then run the '--replace_cluster_mdm ' command again.

Additional Information

See PowerFlex How to replace an MDM Cluster node member | Dell US 

Affected Products

PowerFlex rack, VxFlex Product Family
Article Properties
Article Number: 000033324
Article Type: Solution
Last Modified: 29 Jan 2025
Version:  4
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