Home > Storage > PowerFlex > White Papers > Dell APEX Block Storage for Azure: Microsoft SQL Server 2022 Deployment and Performance Best Practices > Multiple availability zones
The Dell APEX Block Storage self-healing architecture simplifies and increases the infrastructure availability. It is designed to remain running even when it encounters failures. The mesh-mirror architecture enables fast rebuilds, allowing Dell APEX Block Storage to recover rapidly from failures and to keep operating, without degrading performance or compromising availability. You can also extend this availability and configure it to protect your application availability across multiple availability zones.
Durability means:
Architecting APEX Block Storage with instances spanning across availability zones as fault sets, or fault domains, within the public hyperscalers provides new levels of storage availability and resiliency to the public cloud platforms.
The following figure shows the unique multi-AZ architecture: