User`s guide

Table 5–4 (Cont.) Environment Variables Set During System Configuration
Variable Attributes Function
os_type NV Sets the default operating system.
‘‘vms’’ or ‘‘osf’’—Sets system to boot the SRM
firmware.
‘‘nt’’—Sets system to boot the ARC firmware.
pci_parity NV Disables or enables parity checking on the PCI bus.
‘‘on’’—Enables parity checking for all devices on
the PCI bus.
‘‘off’’—Disables parity checking for all devices on
the PCI bus.
pk*0_fast NV Enables Fast SCSI devices on a SCSI controller to
perform in standard or fast mode.
0—Sets the default speed for devices on the
controller to standard SCSI.
If a controller is set to standard SCSI mode, both
standard and Fast SCSI devices will perform in
standard mode.
1—Sets the default speed for devices on the
controller to Fast SCSI mode.
Devices on a controller that connect to both
standard and Fast SCSI devices will automatically
perform at the appropriate rate for the device,
either fast or standard mode.
pk*0_host_id NV Sets the controller host bus node ID to a value between
0 and 7.
0 to 7—Assigns bus node ID for specified host
adapter.
Key to variable attributes:
NV —- Nonvolatile. The last value saved by system software or set by console commands is
preserved across system initializations, cold bootstraps, and long power outages.
W —- Warm nonvolatile. The last value set by system software is preserved across warm bootstraps
and restarts.
5–16 System Configuration and Setup