Configuring The Scsi Devices; Terminating The Shared Scsi Bus - Fujitsu Siemens Computers MegaRAID 320 User Manual

Storage adapters

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The SCSI bus listed in the hardware requirements must be configured

prior to installation of Cluster Services. This includes:

•

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.

4.5.1

Configuring the SCSI Devices

Each device on the shared SCSI bus must have a unique SCSI ID. Since

most SCSI storage adapters default to SCSI ID 7, part of configuring the

shared SCSI bus is to change the SCSI ID on one storage adapter to a

different SCSI ID, such as SCSI ID 6. If more than one disk is to be on

the shared SCSI bus, each disk must also have a unique SCSI ID.

Some SCSI storage adapters 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,

disable SCSI bus resets, if possible.

4.5.2

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.

4-28

Installing and Configuring Clusters

Configuring the SCSI devices.

Configuring the SCSI storage adapters 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.

Note:

Any devices that are not at the end of the shared bus must

have their internal termination disabled.

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