Home > Storage > PowerFlex > White Papers > Dell APEX Block Storage for AWS: Microsoft SQL Server 2022 on Linux with Multi-AZ Resiliency > PowerFlex architecture using Amazon Public Cloud
The following figure represents the logical architecture used to demonstrate this solution:
In each AZ, two SDS instances are installed on c5n.9xLarge Amazon EC2 instances with the Red Hat Enterprise Linux AMI. The Amazon EC2 instances that are deployed by APEX Block Storage in AWS are backed by EBS drives. There are six APEX Block Storage SDS instances hosted across three availability zones that are part of Fault Set and all are configured into a single protection domain. A single storage pool is created, using all the storage devices available within the protection domain.
APEX Block Storage software maintains the user data in a mesh mirrored layout such that each piece of data has two copies (primary and secondary) stored on two different storage optimized Amazon EC2 instances (SDS). The copies are evenly distributed across the SDS instances, which enables the system to maintain data availability and high-performance if there is a failure of a storage device or Amazon EC2 storage optimized instance.
The volumes that are created from the storage pool are mapped to Amazon EC2 compute instances running APEX Block Storage SDC services. The volumes mapped to instances are then used to create the file system to host the database data, log, and tempdb files as needed.