Technical data

• Only RA3000 storage units visible to the host as LUN0 (storage units
with a zero (0) as the last digit of the unit number such as D0, D100,
D200, and so forth) can be used as a boot device.
• StorageWorks Command Console (SWCC) V2.2 is the only configuration
utility that will work with the RA3000. SWCC V2.2 runs only on a
Microsoft Windows NT or Windows 2000 PC.
• The controller will not operate without at least one 16-MB SIMM
installed in its cache.
• The device expansion shelf (DS-SWXRA-GN) for the rackmount version
must be at revision level B01 or higher.
• The single-ended personality module used in the DS-SWXRA-GN
UltraSCSI storage expansion shelves must be at revision H01 or higher.
• The RA3000 order includes an uninterruptible power supply (UPS),
which must be connected to the RA3000.
2.6 SCSI Signal Converters
If you are using a standalone storage shelf with a single-ended SCSI
interface in your cluster configuration, you must connect it to a SCSI signal
converter. SCSI signal converters convert wide, differential SCSI to narrow
or wide, single-ended SCSI and vice versa. Some signal converters are
standalone desktop units and some are StorageWorks building blocks (SBBs)
that you install in storage shelves disk slots.
______________________ Note _______________________
UltraSCSI hubs logically belong in this section because they
contain a DOC (DWZZA on a chip) chip, but they are discussed
separately in Section 2.7.
The restrictions for SCSI signal converters are as follows:
• If you remove the cover from a standalone unit, be sure to replace the
star washers on all four screws that hold the cover in place when you
reattach the cover. If the washers are not replaced, the SCSI signal
converter may not function correctly because of noise.
• If you want to disconnect a SCSI signal converter from a shared SCSI
bus, you must turn off the signal converter before disconnecting the
cables. To reconnect the signal converter to the shared bus, connect the
cables before turning on the signal converter. Use the power switch to
turn off a standalone SCSI signal converter. To turn off an SBB SCSI
signal converter, pull it from its disk slot.
2–12 Hardware Requirements and Restrictions