Compaq VAX 7000 Guía de instalación descargar pdf (Pagina 15)

3.3.3 Futurebus+ PIU

Only supported on DEC7000/10000 systems.

The Futurebus+ PIU houses a Futurebus+ card cage and regulators. It occupies 1 (lower,

rear) PIU quadrant. A maximum of 2 per cabinet and 3 per system is allowed (1 XMI must

be present).

The Futurebus backplane has 10 slots. Slot 5 contains the FLAG module, leaving 9 slots

for I/O.

See Section 5 for a discussion of the Futurebus+ itself.

3.3.4 SCSI Disk and Tape PIU

Only supported on DEC7000/10000 systems.

The SCSI disk and tape PIU houses any combination of 3.5" disk and tape drives and 5.25"

disk drives. It occupies 1 (any) PIU quadrant. A maximum of 2 in the system cabinet and

4 in the expander is allowed.

This PIU contains 2 vertical sections (called shelves!) Each shelf has 7 slots for disks or

tapes. 3.5" devices, RZ26-VA or TLZ06-VA, use 1 slot. 5.25" devices, RZ73-VA, use 3 slots.

To satisfy airﬂow requirements, the PIU is mounted upside-down if ﬁtted in the top of an

expander cabinet.

3.3.5 DSSI Disk PIU

The DSSI disk PIU houses 1 to 3 disk "bricks". Each brick contains 2 x 5.25" disks (EG:

RF73). It occupies 1 (any) PIU quadrant. A maximum of 2 in the system cabinet and 4 in

the expander is allowed. To satisfy airﬂow requirements, disk bricks are installed starting

closest to the blower and working down (or up). Also, the PIU is mounted upside-down if

ﬁtted in the top of an expander cabinet.

3.3.6 Battery PIU

The battery PIU houses 1 to 3 battery blocks. Each block contains 4 x 12v batteries. 1

block is required for each 48v regulator. This PIU requires 2 (lower) PIU quadrants due

to it’s size and weight. A maximum of 1 per cabinet is allowed. If the 48v regulators are

reconﬁgured for phase balancing (see Section 3.1.3, Power ), then the batteries must also be

reconﬁgured. See Platform Service Manual for more details.

The batteries are used as a UPS rather than BBU. They supply power to everything in the

cabinet and provide ’ride-through’ for short duration power outages. On a fully conﬁgured

7000 system they provide a UPS for 10 minutes. On a 10000 system special half-width

battery cabinets are supplied, containing sufﬁcient battery PIUs to provide a UPS for 1

hour.

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Compaq VAX 7000 Guía de instalación Pagina 15