Integrated HP NetRAID Controller Config. Guide

Chapter 4 Planning

Detailed descriptions of the SCSI channels are as follows:

• HP NetServer LH 3/3r and LH 4/4r:

◊ SCSI A has these characteristics:

∗ By default, SCSI channel A is connected to the hot-swap mass

storage cage that was shipped with your HP NetServer.

∗ By default, the integrated HP NetRAID subsystem is enabled for

SCSI A.

◊ SCSI B has these characteristics:

∗ By default, SCSI channel B is connected to the non-hot-swap

devices. If you install a second hot-swap mass storage cage, you

can connect it to SCSI B. There are two connectors on SCSI

channel B: the SE connector is designed for the single-ended (SE),

non-hot-swap devices; the other connector, SCSI B, supports

Ultra2 (LVD), hot-swap drives. The two connectors are on the

same SCSI bus, but LVD operation does not affect devices

connected to the SE connector. However, SE devices and LVD

devices cannot share the same SCSI ID. To resolve a conflict,

change the SCSI address of the non-hot-swap device by resetting

its SCSI address switches.

∗ By default, the integrated HP NetRAID subsystem is disabled for

SCSI B. However, you can enable the integrated HP NetRAID

subsystem on SCSI B, as described in Step D in Chapter 5 of this

guide.

∗ If you enable HP NetRAID for SCSI B, all non-hot-swap SCSI

devices and all hot-swap drives in the second hot-swap mass

storage cage become part of the HP NetRAID subsystem.

∗ If you enable HP NetRAID for SCSI B, you cannot use devices

with multiple LUNs (logical units) in the non-hot-swap shelves.

An example of a device with multiple LUNs that you cannot use is

an autoloader tape device. If you want to use a device with multiple

LUNs, and you want to enable HP NetRAID for SCSI B, you must

connect the device to a SCSI controller accessory board.

∗ If you enable HP NetRAID for SCSI B and you plan to use a tape

backup device, you must connect the device to a SCSI controller

accessory board.