HP RA7000 manual Perform a System Backup, Plan the Basic Cluster Layout Scsi Bus Interconnect

RA7000 / ESA10000 High Availability Solution Kit for HP-UX

1.3 Perform a System Backup

Follow normal procedures to backup the RAID subsystem and the host servers in your cluster, as applicable, prior to installing any of the cluster components.

1.4Plan the Basic Cluster Layout (SCSI Bus Interconnect)

To plan the layout of cluster components through the SCSI bus, first define the two ends of the SCSI bus by selecting where you want to locate the RAID subsystem on the bus relative to the other components (the two HP hosts and, if applicable, the SCSI Hub). Determining the RAID location depends on your preference or any physical limitations of your facility (see “Note” below). You can locate the RAID subsystem:

∙In the middle of the SCSI bus - (Mid-Bus RAID)

∙Radiating from a Hub - (Hub-Radiant RAID)

∙On an end of the SCSI bus - (End-Bus RAID)

NOTE

The maximum bus length for a mid-bus or an end- bus RAID layout is 25M (include the Y-cable length when calculating total bus length).

For a hub-radiant RAID layout, the maximum distance of each radial arm (from the hub to a device) is 25M.

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