Dell DD and PowerProtect Hardware 8.0 Features and Specifications

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DD9900 SSD usage and configurations

DD9900 system uses an 8 x 2.5" drive slot midplane. However, metadata cache devices are implemented using the external flash shelf FS25. This allows dual access to all SSD devices which doubles the SSD access bandwidth.

SSD configurations

The SSD slots on the front of the enclosure are shown below. The system come from the factory with SSDs populated in the enclosure.

DD9900 supports 2.5% SSD option out of factory. Based on 3.84 TB SSD capacity, the required number of SSDs for each DD9900 configuration is provided in the following table.

Table 1. DD9900 SSD configurations
Configuration		Single node	HA
Cache SSDs		10 (External FS25) 3.84 TB

SSD boot drives

Other SAS SSDs are used to boot the operating system. Boot disks and external disk shelves are used to log system information. Boot disks are installed from the other end of the front 2.5" disk slots to physically differentiate the cache SSDs.

Table 2. SSD boot drives
# of boot disks	Installed in slots
Four 1.92TB SSDs	0,1,2,3