Failure Handling in vSAN

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vSAN implements mechanisms for indicating failures and rebuilding unavailable data for data protection.

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Failure States of vSAN Components
In vSAN, components that have failed can be in absent or degraded state.
Object States That Indicate Problems in vSAN
Examine the compliance status and the operational state of a virtual machine object to find how a failure in the cluster affects the virtual machine.
Accessibility of Virtual Machines Upon a Failure in vSAN
If a virtual machine uses vSAN storage, its storage accessibility might change according to the type of failure in the vSAN cluster.
Storage Device is Failing in vSAN Cluster
vSAN monitors the performance of each storage device and proactively isolates unhealthy devices.
Capacity Device Not Accessible in vSAN Cluster
When a magnetic disk or flash capacity device fails, vSAN evaluates the accessibility of the objects on the device.
Storage Pool Device Is Not Accessible in vSAN ESA Cluster
When a storage pool device fails, vSAN evaluates the accessibility of the objects on the device.
A Flash Caching Device Is Not Accessible in a vSAN Cluster
When a flash caching device fails, vSAN evaluates the accessibility of the objects on the disk group that contains the cache device.
A Host Is Not Responding in vSAN Cluster
If a host stops responding due to failure or reboot of the host, vSAN waits for the host to recover and rebuilds the components elsewhere in the cluster.
Network Connectivity Is Lost in vSAN Cluster
When the connectivity between the hosts in the cluster is lost, vSAN determines the active partition.
A Storage Controller Fails in vSAN Cluster
When a storage controller fails, vSAN evaluates the accessibility of the objects on the disk groups that are attached to the controller.
vSAN Stretched Cluster Site Fails or Loses Network Connection
A vSAN 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 vSAN

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