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.