12 Gbit/s SAS Expansion Module
An expansion module provides expansion ports that are used for communication between a controller enclosure and a SAS disk enclosure.
Function
A 12 Gbit/s SAS expansion module provides four 4 x 12 Gbit/s mini SAS HD expansion ports that provide connectivity to disk enclosures. The SAS expansion module connects to the back-end storage array of the storage system via a mini SAS HD cable. When the transfer rate of the connected device is less than that of the expansion port, the expansion port automatically adjusts the transfer rate to that of the connected device to ensure the connectivity of the data transfer channel.
Ports
Figure 4-31 shows the appearance of a 12 Gbit/s SAS expansion module. In the label, BE indicates back-end.
Indicators
Table 4-20 describes indicators on a 12 Gbit/s SAS expansion module of a powered-on storage system.
Indicator |
Status and Description |
|---|---|
Module Power indicator |
|
Indicator of the mini SAS HD expansion port |
|