Maintenance Mode

When a physical machine (PM) enters maintenance mode, it goes offline for service. When you finalize service, the PM exits maintenance mode and goes back online, becoming available for running virtual machines (VMs).

For a system configured with two nodes (that is, two PMs), note the following:

When one PM enters maintenance mode, the PM migrates the VMs running on it to the other PM, which protects the VMs from any potential disruption caused by the service. When both PMs enter maintenance mode, the PMs perform an orderly shutdown of all VMs, which protects their memory state before the PMs shut down or reboot.
When the primary PM (nodex (primary)) enters maintenance mode, the other PM becomes primary.
If you want both PMs in maintenance mode, first enter the secondary PM into maintenance mode, and then enter the primary PM into maintenance mode. This sequence avoids the unnecessary migration of VMs.

For a system configured with one node (that is, one PM), the PM shuts down VMs when it enters maintenance mode. So, place the PM in maintenance mode only during a planned maintenance period.

Shut down the PMs only from the Physical Machines page with the PM in maintenance mode because the ztC Edge Console protects the system from disruptive action that results from manually powering down a PM.

Cautions:

The system is not fault tolerant when a PM is in maintenance mode. For continuous uptime, finalize service as soon as possible so that the PM can exit maintenance mode and go back online.
Place all PMs in maintenance mode only if you are able to shut down all business processing. If you need to keep VMs running on a system configured with two PMs, avoid entering both PMs into maintenance mode at the same time. To keep VMs running, at least one PM must be up and running normally. (If you need to shut down the entire ztC Edge system, see Shutting Down a Physical Machine.)

Note: Shut down any unprotected VMs before entering a PM into maintenance mode. If the PM contains unprotected VMs, the system automatically shuts them down before initiating maintenance mode. For more information, see Unprotected Operation.

To enter a PM into maintenance mode

Select a PM from the Physical Machines page.
Click Work On.

When the PM is in maintenance mode, its state displays .

To finalize and exit a PM from maintenance mode

Select a PM from the Physical Machines page.
Click Finalize, which exits the PM from maintenance mode.

Maintenance Mode

To enter a PM into maintenance mode

To finalize and exit a PM from maintenance mode

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