LSI MegaRAID SCSI 320-2 RAID Controller Series 518 - Manual (Page 122)

7-28 Installing and Configuring Clusters
Copyright © 2002 by LSI Logic Corporation. All rights reserved.
The SCSI bus listed in the hardware requirements must be configured
prior to installation of Cluster Services. This includes:
•
Configuring the SCSI devices.
•
Configuring the SCSI controllers and hard disks to work properly on
a shared SCSI bus.
•
Properly terminating the bus. The shared SCSI bus must have a
terminator at each end of the bus. It is possible to have multiple
shared SCSI buses between the nodes of a cluster.
In addition to the information on the next page, refer to the
documentation from the SCSI device manufacturer or the SCSI
specifications, which can be ordered from the American National
Standards Institute (ANSI). The ANSI web site contains a catalog that
you can search for the SCSI specifications.
7.5.1 Configuring the SCSI Devices
Each device on the shared SCSI bus must have a unique SCSI ID. Since
most SCSI controllers default to SCSI ID 7, part of configuring the shared
SCSI bus will be to change the SCSI ID on one controller to a different
SCSI ID, such as SCSI ID 6. If there is more than one disk that will be
on the shared SCSI bus, each disk must also have a unique SCSI ID.
Some SCSI controllers reset the SCSI bus when they initialize at boot
time. If this occurs, the bus reset can interrupt any data transfers
between the other node and disks on the shared SCSI bus. Therefore,
SCSI bus resets should be disabled if possible.
7.5.2 Terminating the Shared SCSI Bus
You can connect Y cables to devices if the device is at the end of the
SCSI bus. You can then attach a terminator to one branch of the Y cable
to terminate the SCSI bus. This method of termination requires either
disabling or removing any internal terminators the device has.
Note: Any devices that are not at the end of the shared bus must
have their internal termination disabled.