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CHAPTER 11 Input-Output Units
11.1 Disk Units
Key features
The following features of the disk units are applied for the GP7000F main cabinet, Expansion Disk
Cabinet and Expansion File Unit.
3.5-inch UltraSCSI wide disk drive, up to 40 MB/s transfer rate.
SCA-II (Single Connector Attachment II) connector, which support hot-swap.
Geographical SCSI addressing, which depend upon disk drive bay, simplifies SCSI address
selection.
Hot-swapping a disk unit
The hot swap feature, combined with disk mirroring, improves system availability. The system
administrator or service engineers can determine the status of disk unit using the software
management command for disk mirroring. In addition, each disk unit has two status LEDs along
each disk drive bay.
Table 11.1 Disk Units LEDs
Name Color Status
ACTIVE LED Green Lights when the SCSI command is executed.
FAULT LED Amber Lights when the hot replacement command is executed.
IMPORTANT
To hot-swap a disk unit, you need to use the software tool which is provided in "Basic
Software Extension" or "Enhanced Support Facility". Please refer to user’s guide of the
"Basic Software Extension" or "Enhanced Support Facility" for more information. The
FAULT LED lights up according to the procedures described in the user’s guide to identify
the failed disk unit. If the FAULT LED does not light up even if you follow the procedures
described in the user’s guide, hot-swapping is not possible. In this case, power-off the
entire system, then replace the disk unit.
When adding a new disk unit while the system is running, use the software tool, as well.
The POWER LED is installed in the disk cage. If the FAULT LED and ACTIVE LED of a disk
drive bay that has a disk drive doesn’t light up, check the POWER LED if it is light up or not.
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