The PowerStore base enclosure can be configured with NVMe SCM or SSD drives for user data. While NVMe SCM drives provide better performance, the disk capacity of an NVMe SCM-based appliance is limited to the disks in a base enclosure and cannot be expanded with an expansion enclosure.
PowerStore systems require a minimum of six and a maximum of 23 NVMe SCM drives in the base enclosure, as shown in the following figure:
Figure 5. PowerStore with NVMe SCM drives
NVMe SSD-based systems can also be expanded with an expansion enclosure using SAS SSD drives to increase the amount of available storage capacity. It is recommended that all drives within a PowerStore system be the same size to maximize the usable capacity from each drive. PowerStore systems require between six and 23 NVMe SSD drives in the base enclosure.
The SAP HANA certification was achieved with NVMe SSD-based systems, as shown in the following figure:
Figure 6. PowerStore with NVMe SSD and SAS SSD drives
The system does not change the stripe width as more drives are added. Given that
RAID 5 8+1 provides greater usable capacity from the same number of drives, we recommend initially installing a PowerStore system with a minimum of 10 drives.
All drives in the system are automatically used to provide storage capacity. User configuration of the drives is not necessary and dedicated hot spare drives are not required in PowerStore systems. Spare space for a rebuild is automatically distributed across all drives, providing better resource utilization and enabling a faster rebuild in case of a drive failure.