LRC needs upgrading or LRC, ESH, or ESH2 fails

About the modules

The LRC, ESH, or ESH2 module in a DS14/DS14mk2 FC includes a SCSI-3 Enclosure Services Processor. It maintains the integrity of the loop when disks are swapped and provides signal retiming for enhanced loop stability. There are two modules in the middle of the rear of the disk shelf, one for Channel A and one for Channel B.

Note
The Input and Output ports on module B on the DS14/DS14mk2 FC are inverted from module A.

Connectors in an LRC, ESH, or ESH2

The module has the following connectors.

Module connector	Function
Input	Provides the interface between the disk shelf and the storage appliance.
Output	Provides the interface between two disk shelves to create a loop of daisy-chained disk shelves.

For detailed information

This section provides information about the following topics:

Upgrading LRC modules to ESH or ESH2 modules
Hot-swapping an LRC, ESH, or ESH2