Scsi Storage Requirements - Red Hat CLUSTER SUITE - CONFIGURING AND MANAGING A CLUSTER 2006 Manual

Appendix A. Supplementary Hardware Information
Figure A-2. Dual-controller RAID Array Connected to Single-initiator Fibre Channel
Interconnects
A.3. SCSI Storage Requirements
A single-initiator SCSI bus has only one node connected to it, and provides host isolation
and better performance than a multi-initiator bus. Single-initiator buses ensure that each
node is protected from disruptions due to the workload, initialization, or repair of the other
nodes.
When using a single- or dual-controller RAID array that has multiple host ports and pro-
vides simultaneous access to all the shared logical units from the host ports on the storage
enclosure, the setup of the single-initiator SCSI buses to connect each cluster node to the
RAID array is possible. If a logical unit can fail over from one controller to the other, the
process must be transparent to the operating system. Note that some RAID controllers re-
strict a set of disks to a specific controller or port. In this case, single-initiator bus setups
are not possible.
A single-initiator bus must adhere to the requirements described in Section A.3.1 SCSI
Configuration Requirements.
To set up a single-initiator SCSI bus configuration, perform the following steps:
Enable the onboard termination for each host bus adapter.
•
Enable the termination for each RAID controller.
•
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