Failure Handling in Virtual SAN

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Virtual SAN implements mechanisms for indicating failures and rebuilding unavailable data for data protection.

Failure States of Virtual SAN Components
In Virtual SAN, components that have failed can be in absent or degraded state. According to the component state, Virtual SAN uses different approaches for recovering virtual machine data.
Object States That Indicate Problems in Virtual SAN
Examine the compliance status and the operational state of a virtual machine object to determine how a failure in the cluster affects the virtual machine.
Accessibility of Virtual Machines Upon a Failure in Virtual SAN
If a virtual machine uses Virtual SAN storage, its storage accessibility might change according to the type of failure in the Virtual SAN cluster.
Storage Device is Failing in a Virtual SAN Cluster
Virtual SAN monitors the performance of each storage device and proactively isolates unhealthy devices. It detects gradual failure of a storage device and isolates the device before congestion builds up within the affected host and the entire Virtual SAN cluster.
Capacity Device Not Accessible in a Virtual SAN Cluster
When a magnetic disk or flash capacity device fails, Virtual SAN evaluates the accessibility of the objects on the device and rebuilds them on another host if space is available and the Primary level of failures to tolerate is set to 1 or more.
A Flash Caching Device Is Not Accessible in a Virtual SAN Cluster
When a flash caching device fails, Virtual SAN evaluates the accessibility of the objects on the disk group that contains the cache device, and rebuilds them on another host if possible and the Primary level of failures to tolerate is set to 1 or more.
A Host Is Not Responding in a Virtual SAN Cluster
If a host stops responding because of a failure or reboot of the host, Virtual SAN waits for the host to recover before Virtual SAN rebuilds the components on the host elsewhere in the cluster.
Network Connectivity Is Lost in the Virtual SAN Cluster
When the connectivity between the hosts in the cluster is lost, Virtual SAN determines the active partition and rebuilds the components from the isolated partition on the active partition if the connectivity is not restored.
A Storage Controller Fails in a Virtual SAN Cluster
When a storage controller fails, Virtual SAN evaluates the accessibility of the objects on the disk groups that are attached to the controller and rebuilds them on another host.
Stretched Cluster Site Fails or Loses Network Connection
A Virtual SAN stretched cluster manages failures that occur due to the loss of a network connection between sites or the temporary loss of one site.

Parent topic: Handling Failures in Virtual SAN

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