Channels - HP D5970A - NetServer - LCII Configuration Manual

Chapter 4

Channels

In this section you determine which physical devices will connect to each SCSI
channel. As explained in Chapter 1, "Introduction," for each channel, you have
either one internal or one external connection. The integrated HP NetRAID
controller supports both internal and external connectors for Channels 0 and 1.
SCSI Channels on the HP NetServer LH 3 and LH 3r
The HP NetServers LH 3 and LH 3r have two SCSI channels: A and B.
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. (For the HP NetServer
LH 3, SCSI A is connected to the right drive cage; for the HP NetServer
LH 3r, SCSI A is connected to the lower drive cage.)
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 SCSI B connectors: one SCSI B connector is
designed for the single-ended (SE), non-hot-swap devices; the other
SCSI B connector supports Ultra2 (LVD) drives. The two connectors are
on the same SCSI bus, but are separated electrically by an LVD to SE
converter. The slow devices on SE are not affected by LVD operation.
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 may 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
Planning
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