Isilon: Onefs: How to change Node LNN number from CLI

Below is the procedure to change the Logical Node Number (LNN) number for a Node according to your workflow requirements.

*NOTE: If the cluster is doing protocol auditing, do the steps below in order to avoid data unavailability. The cluster does not audit protocol traffic while auditing is disabled. Proceed with caution.
 

**WARNING:  If the cluster is using CloudPools, the additional steps in KB 000260843 must also be followed to avoid risks to CloudPools data.
See KB 000260843 - CloudPools lnn rename cookie reservation

Step 1: SSH into any node in the cluster
If you are unsure if the cluster has protocol auditing enabled, you can verify with the following command:

# isi audit settings global view
Protocol Auditing Enabled: Yes  <<<<<<<<<<<<<<<<
            Audited Zones: -
          CEE Server URIs: -
                 Hostname: 
  Config Auditing Enabled: No
    Config Syslog Enabled: No
    Config Syslog Servers: -
  Protocol Syslog Servers: -
     Auto Purging Enabled: No
         Retention Period: 180

 Step 2: Disable auditing before performing the LNN change:

Disable Audit: 
# isi audit settings global modify --protocol-auditing-enabled=no
# isi services -a isi_audit_d disable

Step 3: Run the command "isi config"  then use "lnnset <old lnn> <new lnn>"
(For example if you want to change the LNN number for node 3 to 4)

# isi config      {Press enter}
>> lnnset 3 4                                  {Press enter}

Step 4: Node 3 has now changed to Node 4. The change is applied on 'commit'.

>> commit                                      {Press enter} 
Commit succeeded.

 Re-check if the lnn number changed successfully by running "isi status" or "isi config" then "lnn"

Step 5: Re-enable isi_audit_d and protocol auditing if applicable:

Enable Audit:
# isi services -a isi_audit_d enable

ONLY re-enable if the cluster was doing protocol auditing from the first step:
# isi audit settings global modify --protocol-auditing-enabled=yes

NOTE: Changing a node's LNN with lnnset does not instantly update the node's LCD front panel to display the new LNN. See KB 15082 for details.