In this scenario, we assume you deploy four business VM instances on a host named Host A to run MySQL database services. If a failure occurs to the business NIC of Host A, all four VM instances are expected to migrate to another host, guaranteeing the high availability of your business. To accomplish this, you need to set the HA mode of these VM instances to NeverStop and enable the failover strategy that is applied when the business NIC status turns abnormal. Before you start, make sure there are enough hosts on the Cloud.

VM HA Migration

After you enable the VM failover strategy, if the business NIC of Host A, zsn3 in this scenario, fails, the four VM instances on Host A will immediately migrate to Host B and start.

In this scenario, we assume you deploy three VM instances on a host named Host A to run important business applications and use Ceph primary storage for data storage. If Host A loses connection with the Ceph storage network, all three VM instances are expected to migrate to another host, guaranteeing the high availability of your business. To accomplish this, you need to set the HA mode of these VM instances to NeverStop and enable the failover strategy that is applied when the storage network connectivity status turns abnormal. Before you start, make sure there are enough hosts on the Cloud.

VM HA Migration

After you enable the VM failover strategy, if Host A loses connection with the Ceph storage network, the three VM instances on Host A will immediately migrate to Host B and start.

In this scenario, we assume you deploy four business VM instances to run important business applications, with two residing on SharedBlock storage and two on local storage. If any VM instance is unexpectedly stopped due to host powered-offs, business overloads, or other factors, it is expected to auto restart, guaranteeing your business continuity.

VM Instances Residing on SharedBlock Storage HA Start

VM-SharedBlock-1 and VM-SharedBlock-2 are deployed on Host B, and both VM instances reside on SharedBlock primary storage. If Host B is powered off, these two VM instances will HA start on Host A.

VM Instances Residing on Local Storage HA Start after Unexpected Shutdown

VM-LocalStorage-1 and VM-LocalStorage-2 are deployed on different hosts, and both VM instances reside on local primary storage. If these two VM instances are unexpectedly stopped, they will auto HA start.