Chapter 1 Configuring Disk Slot Associations

This chapter describes how to set up proper associations between disk slot numbers and the physical and logical device names used to identify internal disk drives in a Sun Ultra 450 workstation or Ultra Enterprise 450 server. You must perform the procedure in this chapter if you install one or more optional 8-bay storage expansion kits in a Sun Ultra 450 workstation or Ultra Enterprise 450 server.

Overview

The internal disk array in a Sun Ultra 450 workstation or Ultra Enterprise 450 server can accommodate up to 20 low-profile UltraSCSI disk drives. The basic system configuration includes support for one to four disk drives connected to a 4-slot backplane.

To support five to twelve internal disk drives, you must install an optional 8-bay storage expansion kit, which includes an eight-slot backplane, one dual-channel single-ended UltraSCSI PCI controller card, and all necessary cabling. A second 8-bay storage expansion kit is required to support any more than 12 internal disk drives. These kits may be factory-installed when you purchase your system, or installed later as an upgrade.

If you install an 8-bay storage expansion kit as a system upgrade, you must perform the following procedure to ensure that the system will properly recognize the new UltraSCSI controller cards. The procedure uses a new NVRAM configuration parameter called disk-led-assoc to set up the proper associations between disk slot numbers (0 through 19) and the physical and logical device names used to identify the disk drives installed in each slot.

Setting Disk Slot Associations

Perform the following procedure after you complete the hardware installation of the 8-bay storage expansion kits:

Power on the system.

See "How to Power On the System" in the Sun Ultra 450 Workstation Owner's Guide or Ultra Enterprise 450 Server Owner's Guide.

When the system banner is displayed on the monitor, press Stop-a on the Sun keyboard.

If you are using an alphanumeric terminal instead of a monitor, press the Break key on the terminal's keyboard.

When the ok prompt is displayed, enter the following command:
```
ok setenv disk-led-assoc 0 x y
```
where:
- x is an integer between 1 and 10 identifying the rear panel PCI slot number where the lower UltraSCSI controller is installed
- y is an integer between 1 and 10 identifying the rear panel PCI slot number where the upper UltraSCSI controller is installed
For example, if the controller cards are installed in PCI slots 5 and 7, enter the following:
```
ok setenv disk-led-assoc 0 5 7
```

For a system with only one controller card installed in PCI slot 2, enter the following:

ok setenv disk-led-assoc 0 2

Enter the following command at the ok prompt:
```
ok reset
```

When the system banner is displayed on the monitor, press Stop-a on the Sun keyboard.

If you are using an alphanumeric terminal instead of a monitor, press the Break key on the terminal's keyboard.

Enter the following command to perform a reconfiguration boot:
```
ok boot -r
```
This command rebuilds the device trees for the system, incorporating any newly installed options. After a device has been added to a device tree, it can be recognized by the system. After the reconfiguration reboot has successfully completed, the system prompt is displayed.