Data Domain DD9800 System Installation and Storage Expansion Guide

Connecting multiple DS60 shelves to the DD9800 system

The cabling diagrams in this section show the maximum configurations for the DD9800 systems. Not all systems will have all the disk shelves shown in the diagrams.

Some of the DS60 configurations described in the following sections also include ES30 shelves for DD Cloud Tier metadata, or FS15 shelves for Metadata on flash.

Add shelf-to-shelf cables between shelves in a loop and to the controller as shown in the diagrams.

1. The recommended cabling for DD9800 systems with HA utilizes a maximum of three loops.
2. There are no specific placement or cabling requirements for SSD shelves, or the metadata shelves for DD Cloud Tier configurations. These shelves can be installed and cabled the same way as standard ES30 shelves.
3. The SSD shelf counts towards the total number of shelves connected to the system.
4. Data Domain recommends installing the SSD shelf in the V1.1 positon, but if that is not possible, the shelf can be placed in a different location in the rack so long as cables of sufficient length are available.
   NOTE V1.1 is recommended for better performance because this will the 1^st hop where data will be written. If the SSD shelf is connected to the last enclosure in a chain, then each read/write request has to go through many hops, which introduces latency issues when compared to when the SSD shelf is on the 1^st shelf of a chain.
5. Use the cable management assembly to support and organize all cables from the DD9800 system.

Select the appropriate configuration from the following list, and connect the disk shelves to the Data Domain controller.

• DD9800
• DD9800 with HA
• DD9800 with DD Cloud Tier (Single node)
• DD9800 with DD Cloud Tier (HA)
• DD9800 with ERSO