User's Manual

Figure 4 Disk enclosure (rear view)
9. Enclosure status LEDs5. Fan 1 status LED1. Power supply 1
10. Fan 26. I/O module A2. Power supply 1 status LED
11. Power push button7. I/O module B3. Fan 1
12. Power supply 28. Rear UID push button4. Enclosure product number and serial number
I/O modules
Two I/O modules provide the interface between the disk enclosure and the host controllers, see
Figure 5 (page 11). For redundancy, only dual-controller, dual-loop operation is supported. Each
controller is connected to both I/O modules in the disk enclosure.
Figure 5 I/O module detail
4. Manufacturing diagnostic port1. Double 7-segment display: enclosure ID
5. I/O module status LEDs2. 4-Gb I/O ports
3. Port 1 (P1), Port 2 (P2) status LEDs
Each I/O module has two ports that can transmit and receive data for bidirectional operation.
Activating a port requires connecting a Fibre Channel cable to the port. The port function depends
upon the loop.
I/O module status indicators
There are five status indicators on the I/O module. See Figure 5 (page 11). The status indicator
states for an operational I/O module are shown in Table 1 (page 11). Table 2 (page 12) shows
the status indicator states for a non-operational I/O module.
Table 1 Port status LEDs
DescriptionStatus LED
Green (left)
• Solid green—Active link.
• Flashing green—Locate: remotely asserted by application client.
Amber (right)
• Solid amber—Module fault, no synchronization.
• Flashing amber—Module fault.
M6412 disk enclosures 11