Home > Storage > PowerFlex > White Papers > Installing and configuring Oracle Linux KVM on Dell PowerFlex > Logical architecture
The following figure shows a logical view of the 3-node setup:
Figure 28. Logical architecture
In the two-layer PowerFlex system, the SDC is installed on the compute-only host (Oracle Linux KVM), while the MDM and SDS components are installed on backend, storage-only nodes. The SDS aggregates and serves raw local storage in each node and shares that storage as part of the PowerFlex cluster. A single Storage Pool is created using all the disks on each node within the Protection Domains, volumes are then provisioned from the Storage Pool and presented to the compute hosts, which Oracle Linux Virtualization Manager uses as storage domains. From the storage domain, respective size disks are carved out to meet the Oracle RAC ASM disk group database requirements, including volumes for data, redo logging, voting disk, and the flash recovery area. The volumes are mapped and shared between the virtual machines and then consumed by ASM to create the groups. While the Oracle Grid and database software is installed independently on each VM, the Oracle RAC database itself is built on ASM and thus made available to all the nodes.