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Note:  SRR can be automated by using IBM PowerVC. 

If you start with LPM, the source and targets servers (and their VIOSs) must be running and active. Although the VM that you want to move can be offline, the server it is hosted on must be online. If this criteria is met, then using LPM on an active VM does not result in any downtime. If that VM crashes, LPM does not automatically restart the VM or migrate it to another server because manual intervention is required. Therefore, for applications and VMs where a basic form of planned HA is required, using just LPM is sufficient. However, it is not sufficient when automatic mobility is required or recovery from an offline source server. 

As with LPM, SRR requires the destination server to see the same shared storage as the source server to rebuild the VM. The key difference between SRR and LPM is that the source server must be offline so that the rebuild is successful. 

## 1.3 VM Recovery Manager HA 

HA management is a critical feature of business continuity plans. Any downtime to the software stack can result in loss of revenues and disruption of services. IBM VM Recovery Manager HA for Power Systems is a HA solution that is easy to deploy and provides an automated solution to recover the VMs (LPARs). 

The VM Recovery Manager HA solution implements recovery of the VMs based on the VM restart technology. The VM restart technology relies on an out-of-band monitoring and management component that restarts the VMs on another server when the host infrastructure fails. The VM restart technology is different from the conventional cluster-based technology that deploys redundant hardware and software components for a near-real-time failover operation when a component fails. The cluster-based HA solutions are commonly deployed to protect critical workloads. 

The VM Recovery Manager HA solution is ideal to ensure HA for many VMs. Additionally, the VM Recovery Manager HA solution is easier to manage because it does not have clustering complexities. 

The VM Recovery Manager HA solution provides the capabilities that are described in the following sections. 

