Dell DD and PowerProtect Hardware 8.0 Features and Specifications

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Cache SSD

The DD6400 system requires a certain minimum number of disk drive read I/O operations per second per second (IOPs) in order to properly maintain rated backup throughput performance. Due to the increase of disk drive capacities, large system storage capacities can be created that do not provide enough IOPs since there are fewer disks operating in parallel. SSDs are used to overcome the lack of read IOPs using larger disk drives as a metadata cache to provide the required read IOPs to that metadata.

Table 1. DD6400 SSD characteristics
Writes Per Day Read IOPs Sequential Read Throughput Random Write Throughput
External Capacity SSD 1 WPD 102K@4K 409 MB/s 30 MB/s

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