Dell DD and PowerProtect Hardware 8.0 Features and Specifications
External storage shelves
DD6400 systems store data on internal disk drives. In addition, external disk array shelves provide optional additional storage. ES40 shelves (with 8 TB drives) are connected to the DD6400 systems using 12 Gb Mini-SAS HD ports which are implemented on the SAS HBAs.
Storage shelves and usable storage capacity
The ES40 SAS shelf contains 15 x 8 TB drives, two of which are parity drives and one is a hot spare, so each ES40 shelf provides 12 drives of usable storage. The rough estimate of usable capacity of each shelf is 76 TB of usable capacity, which means that two shelves plus the base would support approximately 184 TB and the associated CT metadata capacity. Only 172 TB is presented. If necessary, either a smaller maximum can be supported to meet performance requirements or an additional shelf can be added.
The table below shows capacity for each physical increment.
| Hard drive size (TB) | Shelf |
|---|---|
| 8 | ES40-120T |
| Configuration | Supported capacity |
|---|---|
| Base (8 internal 8 TB drives) | 32 TB |
| Base and one ES40 | 104 TB |
| Base and two ES40s | 172 TB |
Each SAS chain is a dual-path SAS connection requiring two Mini-SAS HD connections, which protects against ES40 controller failures and improves reliability. Only a single, 2-port, SAS controller is used. One port is connected to LCC-A and the other is connected to LCC-B.
NOTE:While the system is designed to use only two shelves, there are no checks or alerts if more than two shelves are added.
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