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Virtual machine HA definition, principle, HA self-made and virtual machine FT

Latest reply: Jan 22, 2022 02:07:56 568 1 14 0 1

Hello, everyone!

This post is regarding the Virtual machine HA definition, principle, HA self-made, and virtual machine FT. Have a look by reading further down for a more detailed explanation.

Virtual machine HA

When the physical host or the source VM fails, the VM that is smashed is opened on the working host according to the cluster HA policy. The scope is within the cluster. The HA has the cluster policy control. The HA restores the VM when the VM is down. Requires shared storage. When the VRM fails, all CAN nodes in the cluster can be autonomous.

Virtual machine HA principles

VM failure or physical node failure.

VRM queries the VM status and finds that the VM is faulty.

The VRM node determines that the VM has the HA feature, and selects an available CNA host to start the VM according to the saved VM information (specification, volume, etc.).

The CAN node receives the HA request and creates a new VM based on the VM specification and volume information.

Remount the volume before the VM, including the user volume, during the boot process.

HA self-made

The host in the cluster monitors the status of each host and maintains a list of virtual machines by electing a master node. When the host fails, the master node is responsible for starting the virtual machine on the failed node on other hosts.

The 3.0 version of the heartbeat is the management plane, the node state, the virtual machine state is controlled and judged by the VRM, and whether the HA mechanism is enabled.

The 5.0 version is determined by the master system, but it is determined whether HA needs to be enabled according to the management heartbeat and storage heartbeat between each slave node and the master node in the cluster.

The management heartbeat defaults to the management network. The storage heartbeat does not configure the management network by default.

You can switch the virtualized SAN storage heartbeat plane by adding a service interface. The storage heartbeat function is to isolate the faulty host in time to ensure that the virtualized SAN storage is not affected.

That's all, thanks!


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little_fish
Admin Created Jan 22, 2022 02:07:56

Virtual machine HA
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