Specifications

Configuring the Hardware and Installing Windows NT 41
2.6 Installing Internal Hard Drives in the IBM Netfinity 7000
You can install 12 hot-swap hard drives in a Netfinity 7000. The hot-swap
capability is realized through two hot-swap
backplanes in the Netfinity 7000. Each
of the two backplanes connects six hot-swap slimline hard drives. These
backplanes use the industry standard 80 pin Single Connector Attach (SCA) to
connect the Ultra/Wide SCSI II hard drives.
Every SCSI device on a SCSI bus needs a unique SCSI ID. The SCSI hard-disk
drives in the Netfinity 7000 get their SCSI IDs from the hot-swap backplane. On
every backplane is a SAF-TE Enclosure Processor integrated which sends and
receives SAF-TE system management commands across the SCSI bus. This
information are about the status of the hard drives. As the SCSI controller and
backplanes are SCSI devices they require a SCSI ID as well.
Each Netfinity 7000 backplane is connected to each of the two on-board SCSI
adapters. If you want to connect a ServeRAID adapter to these backplanes you
only have to remove the 16-bit SCSI cables from the on-board adapters and
connect these to the ServeRAID adapter. You can connect both backplanes to
one or two channels of the ServeRAID adapter. Due to performance reasons we
recommend to distribute the hard drives over several ServeRAID channel.
But if you want to connect the both backplanes to one ServeRAID adapter
channel or one on-board adapter Ultra/Wide channel you will need a
Backlane
Repeater Kit
part #94G7426. It contains two repeater cards and a SCSI cable to
connect the backplanes and ServeRAID adapter together. The repeater cards will
be connected to every backplane. They ensure the SCSI signal quality so it is
possible to use the Wide Ultra SCSI transfer mode for daisy-chained backplanes.
In the case where you use two backplanes at one SCSI channel you have to
change some settings on the backplanes for the SCSI-IDs and termination. The
option jumper block J10, located on every backplane, determines these settings.
There are default no jumpers on the jumper block installed.
Do the following settings to prepare the backplanes for daisy chaining.
1. Disable the termination on the backplane connected at the middle SCSI cable
connector by installing a jumper on the pins 3-4 of the jumper block J10.
2. Change the SCSI ID settings for the other backplane connected at the last
SCSI cable connector (end of the SCSI bus) by installing a jumper on the pins
5-6 of the jumper block J10, so that all devices get a unique SCSI ID.