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52 Hardware Maintenance Manual: xSeries 250
— SCSI Device Configuration
Select this choice to configure SCSI device parameters. Before you can make
updates, you must know the ID of the device whose parameters you want to
configure.
Note: The Maximum Sync Transfer Rate represents the transfer rate for Ultra
SCSI devices.
– The transfer rate for Ultra-3 SCSI LVD devices is 160.0
– The transfer rate for Ultra-2 SCSI LVD devices is 80.0
– The transfer rate for Fast SCSI devices is 20.0
— Advanced Configuration Options
Select this choice to view or change the settings for advanced configuration
options. These options include enabling support for large hard disk drives
and support for drives with UltraSCSI speeds.
• SCSI Disk Utilities
Select this choice to view the SCSI IDs that are assigned to each device or to
format a SCSI device.
To use the utility program, select a drive from the list. Read the screens carefully
before making a selection.
Note: If you press Ctrl+A before the selected drives are ready, an Unexpected
SCSI Command Failure screen might appear. Restart the server and watch
the SCSISelect messages as each drive spins up. After the drive that you
want to view or format spins up, press Ctrl+A.
• Format Disk
Attention: The Low-Level Format program erases all data and programs.
Select this choice to perform a low-level format on a hard disk drive. Depending
on the hard disk drive capacity, the Low-Level Format program could take up to
two hours.
Use the Low-Level Format program:
— When you are installing software that requires a low-level format
— When you get recurring messages from the diagnostic tests directing you to
run the Low-Level Format program on the hard disk drive
— As a last resort before replacing a failing hard disk drive
Note: If the server has a PCI RAID adapter installed, refer to the RAID adapter
documentation for instructions for performing low-level formats on hard
disk drives attached to the adapter.
To start the Low-Level Format program:
1. If the hard disk is working, make a backup copy of all the files and programs
on the hard disk drive. (See the operating system information for
instructions.)
2. Select Format Disk; then, follow the instructions on the screen.
Note: Hard disks normally contain more tracks than their stated capacity (to
allow for defective tracks). A message appears on the screen if the
defect limit is reached. If this happens, replace the hard disk drive.