Compaq ProLiant 6400R Compaq Parallel Database Cluster Model PDC/05000 for Ora - Page 106

5-10 Compaq Parallel Database Cluster Model PDC/O5000 for Oracle8i and Windows 2000 Administrator Guide Installing Hardware Into an MA8000/EMA12000 Storage Subsystem Installing Hardware into a Controller Enclosure The controller enclosure for the MA8000/EMA12000 Storage Subsystem houses the two HSG80 Array Controllers, one cache module for each controller, an environmental monitoring unit (EMU), one or two power supplies, and three dual-speed fans. In addition, the controller enclosure houses the six I/O modules that connect the enclosure's six SCSI buses to up to six disk enclosures. For detailed instructions on installing hardware components in a controller enclosure, refer to the documentation provided with the MA8000/EMA12000 Storage Subsystem. Installing Hardware into a Disk Enclosure Each disk enclosure houses up to 12 or 14 form factor hard disk drives, depending on the number of SCSI buses connected to the enclosure's I/O module. Disk enclosures using a single-bus I/O module can contain up to 12 disk drives. Disk enclosures using both connectors on a dual-bus I/O module can contain up to 14 disk drives (7 per SCSI bus). When you have more than three disk enclosures in your subsystem, they must all use single-bus I/O modules, for a maximum of 72 disk drives in each MA8000/EMA12000 Storage Subsystem. Each disk enclosure also contains redundant power supplies, an EMU, and two variable-speed blowers. A single-bus or dual-bus I/O module connects each disk enclosure by UltraSCSI cable to one I/O module in the controller enclosure. For detailed instructions on installing hardware components in a disk enclosure, refer to the documentation provided with the MA8000/EMA12000 Storage Subsystem.