Dell DD and PowerProtect Hardware 8.0 Features and Specifications
DD9400 storage capacity and configurations
The following table provides storage capacity and configuration information for the DD9400 system.
| Tier | CPU-SP SKU | Memory | Front 2.5" SSDs | Max. Useable Capacity | Cloud Tier Metadata |
|---|---|---|---|---|---|
| DD9400 Active Tier | 16 core, 125 W 5218 | 576 GB (12 x 16 GB) + (12 x 32 GB) | 5 (2.5%) | 768TBu | N/A |
| DD9400 with Cloud Tier 1 | 16 core, 125 W 5218 | 576 GB (12 x 16 GB) + (12 x 32 GB) | 5 (2.5%) | 1248TBu | 240 TB raw/192 TB usable |
1Cloud Tier can be added to a DD9400 and is enabled by a license and disk packs for the Cloud Tier metadata.
The Memory column lists the total memory that is required and the number and type of the DIMMs used. All memory DIMMs are DDR4 RDIMMs at the highest supported speed of 2666 MT/s.
High Availability
DD9400 supports Active-Passive High Availability (A-P HA or just A-P). The following table summarizes the hardware changes to support A-P HA:
| Hardware Change to support HA | Active-Passive HA |
|---|---|
| Additional memory | No extra memory required. |
| HA private interconnect | Cluster Interconnect : A-P requires the use of two ports from the onboard quad-port 10 GbE Network Daughter Card. |
| NVRAM | A-P requires a single 16 GB NVRAM card (the same as non-HA). |
| SAS Connectivity | Both nodes of an A-P HA pair require redundant SAS connectivity to the storage array. (Note: a single node system also has redundant connectivity to the storage array.) |
| SSD Requirements | SSDs are contained within FS25 and are available from both nodes. |
HA Network Interconnect
The HA Network Interconnect, required for HA configurations, is a dedicated 10 GbE connection between the two nodes of an HA pair. The interconnect is used to write data (and metadata) from NVRAM of the active node to NVRAM of the passive node.
Two 10GbE links are used to meet the bandwidth requirements for the private interconnect. Traffic across the private interconnect has roughly the same bandwidth as is written to the NVRAM card. The dual 10-GbE links can move about 2 GB/s in each direction.
See Connecting the HA interconnect section in PowerProtect DD9400 System Installation and Storage Expansion Guide for more information about specific ports to connect interconnect.
HA SAS Interconnect
HA configurations require that the cache drives of the SSDs be shared between both nodes and have redundant SAS connections to all shelves.
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