Users Guide
Assigning backup lead
In a multi-chassis environment, the lead chassis may sometimes fail temporarily or retire. In such situations, it is necessary to
nominate a member chassis in the MCM group as a backup to the lead chassis. The backup lead chassis is promoted as a lead
chassis when the existing lead chassis fails or retires.
1. On the MCM dashboard, click Configure > Edit Backup Lead Settings.
The Edit Backup Lead Settings window is displayed.
If a backup is already assigned, the name of the backup chassis is displayed in the Current backup field.
2. From the Assign backup drop-down, select the name of the member chassis that you want to select as the backup lead
chassis.
3. Click the Lead Virtual IP Configuration (Optional) and select the Enable Virtual IP check box.
The virtual IP, if configured, facilitates consistency in the IP when the lead chassis role is transferred from one chassis to
another.
4. Click Additional Information to view details about enabling the virtual IP. The details are:
● Modifying the network settings may impact the virtual IP configuration
● Disabling the NIC will also disable the virtual IP
● Disabling IPv4 will not disable the virtual IP
● Enabling VLAN will leave the virtual IP accessible only within the specified VLAN
● Enabling/disabling DHCP for IPv4 will reconfigure the virtual IP to match the new subnet mask and gateway
Also, see the section, Use case scenarios.
When a job for assigning a member chassis as the backup lead is stopped, the status of the job on the Jobs page is displayed
as Stopped. However, the member chassis is assigned as the backup lead of the group.
Promoting backup chassis as lead
You can promote the backup chassis as the new lead chassis when the existing lead chassis fails. If the initial lead chassis is
available, you can also assign it as a member chassis. To promote the backup chassis as the lead chassis, you must log in to the
backup chassis.
After promoting a backup lead as lead chassis, detach and reattach any profiles that are attached to a slot containing a compute
sled, in the new lead. Detaching and reattaching the profiles ensures that the assignment is persistent. The "promote" task does
not affect profiles that are assigned to empty slots. Also, see the section, Use case scenarios.
1. On home page of the backup chassis, click Configure > Promote As Lead Chassis.
The Promote As Lead Chassis window is displayed.
2. Click Promote.
After promoting the backup lead as the new lead of the chassis group, if you have the chassis administrator privileges, perform
the following steps before putting the old lead chassis back into the production environment:
1. From the new lead chassis, remove the old lead chassis from the group to remove all references to the old lead chassis.
2. Remove the old lead chassis from the stacking network.
3. Run a forced reset configuration action by using the REST API, URI:/api/ApplicationService/Actions/
ApplicationService.ResetApplication For details, see the OpenManage Enterprise and OpenManage Enterprise -
Modular Edition RESTful API Guide.
The reset configuration task transitions the old chassis to a stand-alone chassis and ready to be part of the production
environment.
When a backup lead is promoted as the lead chassis, join requests from other member chassis sent to the earlier lead chassis,
are not displayed on the MCM dashboard of the new lead. As a result, the particular member chassis cannot send joining
requests to other groups in the stack. To unblock the pending requests, run the following API from the member chassis from
which the joining requests were sent and resend the requests:
URI—/api/ManagementDomainService/Actions/ManagementDomainService.DeletePendingDomains
Method—POST
Payload—empty
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Logging in to OME-Modular