LSI 1600 User Manual
Chapter 7 Cluster Installation and Configuration
105
SCSI Drive Installations
This information is provided as a generic instruction set for SCSI drive installations. If the SCSI
hard disk vendor’s instructions conflict with the instructions in this section, always use the
instructions supplied by the vendor.
hard disk vendor’s instructions conflict with the instructions in this section, always use the
instructions supplied by the vendor.
The SCSI bus listed in the hardware requirements must be configured prior to installation of
Cluster Services. This includes:
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.
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.
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.
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.
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.
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.
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.
Trilink connectors can be connected to certain devices. If the device is at the end of the bus, you
can use a trilink connector to terminate the bus. This method of termination requires either
disabling or removing any internal terminators the device contains.
Y cables and trilink connectors are the recommended termination methods, as they provide
termination even when one node is not online.
can use a trilink connector to terminate the bus. This method of termination requires either
disabling or removing any internal terminators the device contains.
Y cables and trilink connectors are the recommended termination methods, as they provide
termination even when one node is not online.
Note:
Any devices that are not at the end of the shared bus must have their internal termination disabled.