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11
Disk I/O module
The expansion enclosure houses one or two Disk I/O modules. They provide the drive expansion
for the RAID enclosure. When expanding the system, you may add up to four expansion enclosures.
This will give you a total of five enclosures including the RAID enclosure. A fully loaded system
will provide a total of 60 disk drives.
Processors housed on the Disk I/O modules provide enclosure management and an interface to
the devices on the backplane, PSU, Disk I/O module and Ops panel, which monitor internal
functions. These Disk I/O module processors operate in a master-slave configuration to allow for
failover.
The enclosure may be configured with either one or two modules. If only one Disk I/O module is
installed, a blank module must be installed in the unused bay.
Each SAS connector has four LEDs adjacent to the connector. The LEDs indicate I/O activity on that
specific SAS port lane where each port has four lanes.
Important
Do not mix Disk I/O modules and RAID Controller modules in the same enclosure. Disk
I/O modules are only installed in the expansion enclosure and RAID Controllers are only
installed in the RAID enclosure.
Important
The OUT port on the RAID Controller or DIsk I/O module connects to the IN port on
the Disk I/O module in the next E-842R enclosure in a multiple enclosure configuration, See
“Enclosure cabling - multiple enclosures” on page 25 for further information on enclosure
expansion.