RA8000 and ESA12000 Storage Subsystems
4–20
387404–001
EK–SMCPR–UG. A01
4.7
I/O Module and Expansion Cable Error Conditions
The EMU monitors the status of all the I/O modules for the following error conditions:
•
The installation of incompatible I/O modules
•
A TERMPOWER problem
Either of these error conditions might cause the array controller to cease operation
without implementing procedures to protect the data.
4.7.1 I/O Module or Expansion Cable
Follow these procedures to remove an I/O module or expansion cable:
CAUTION
Before removing an I/O module or an expansion cable,
completion of the following procedures is mandatory to
prevent inducing an array controller error condition.
1. Clear the cache and shut down the array controller.
2. Turn OFF the subsystem power.
NOTE
For dual-redundant array controller configurations, you can
remove the I/O module while the subsystem is running
using the field replacement utility (FRUTIL). Refer to
“Replacement Procedures” in the
HSG80 or HSZ80 Array
Controller ACS Version 8.x Maintenance and Service
Guide.
4.7.2 Incompatible I/O Modules
Only when all I/O modules are the same type can an UltraSCSI RAID subsystem function
properly. The Compaq UltraSCSI array controller only supports single-ended, UltraSCSI
buses. Therefore, you can only use single-ended I/O modules. Installing any other module
type creates an error condition that the EMU reports to the array controller.
4.7.3 No I/O Module Installed
Failure to install an I/O module, or installing an I/O module incorrectly, automatically
disables the SCSI bus within the enclosure. Without an I/O module, the TERMPOWER
becomes unavailable to the internal SCSI bus and the bus cannot function.