Compaq AA-RHGWC-TE manual 2 BA356 Storage Shelf, Non-UltraSCSI BA356 Storage Shelf

Figure 9–6: BA350 Internal SCSI Bus

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9.3.2 BA356 Storage Shelf

There are two variations of the BA356 used in TruCluster Server clusters: the BA356 (non-UltraSCSI BA356) and the UltraSCSI BA356.

An example of the non-UltraSCSI BA356 is the BA356-KC, which has a wide, single-ended internal SCSI bus. It has a BA35X-MH 16-bit personality module (only used for SCSI ID selection) and a 150-watt power supply. It is referred to as the non-UltraSCSI BA356 or BA356 in this manual. You use a DWZZB-VW as the interface between the wide, differential shared SCSI bus and the BA356 wide, single-ended SCSI bus segment.

9.3.2.1 Non-UltraSCSI BA356 Storage Shelf

The non-UltraSCSI BA356, like the BA350, can hold up to seven StorageWorks building blocks (SBBs). However, unlike the BA350, these SBBs are wide devices and can therefore support up to 16 disks (in two BA356 shelves). Also, like the BA350, the SBB SCSI IDs are based upon the slot they are installed in. The switches on the personality module (BA35X-MH) determine whether the disks respond to SCSI IDs 0 through 6 (slot 7 is the power supply) or 8 through 14 (slot 15 is the power supply). To

9–10Configurations Using External Termination or Radial Connections to Non-UltraSCSI Devices