Administrator's Guide

NOTE: A large number of disk errors may indicate that an I/O module has failed. Inspect the
I/O module LEDs on the messaging system and any expansion disk enclosures, and replace any
failed component.
• Because both a system and drive fan are required, the maximum and minimum number of
fans required is two. If either fan becomes degraded, the system could shut down quickly.
Because the fans are not mutually redundant, even if the status of a single fan has changed,
the new status is reported immediately in the Components Status Summary section on the SMH
main page.
• When the Enclosure Manager IP address is set incorrectly, the enclosure status displayed is
Lost communication. Because the Enclosure Manager has lost communication with the external
network, none of the other items in the Enclosure Information section can be displayed.
The enclosure I/O ports are numbered from 1 to 8 in the SMH.
Figure 25 I/O module
These numbers correspond to the I/O modules in the enclosure bays.
Figure 26 I/O module bays
5. PCIe module1. LOM module
6. PCIe module2. LOM module
7. SAS I/O module3. MEZZ module
8. SAS I/O module4. MEZZ module
40 Monitoring and troubleshooting the messaging system