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______________________ Note _______________________
We could list the UltraSCSI hubs 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.
• If you observe any “bus hung” messages, your DWZZA signal converters
may have the incorrect hardware. In addition, some DWZZA signal
converters that appear to have the correct hardware revision may cause
problems if they also have serial numbers in the range of CX444xxxxx
to CX449xxxxx.
To upgrade a DWZZA-AA or DWZZA-VA signal converter to the correct
revision, use the appropriate field change order (FCO), as follows:
– DWZZA-AA-F002
– DWZZA-VA-F001
2.7 DS-DWZZH-03 and DS-DWZZH-05 UltraSCSI Hubs
The DS-DWZZH-03 and DS-DWZZH-05 series UltraSCSI hubs are the only
hubs supported in a TruCluster Server configuration. They are SCSI-2-
and draft SCSI-3-compliant SCSI 16-bit signal converters capable of data
transfer rates of up to 40 MB/sec.
These hubs can be listed with the other SCSI bus signal converters, but as
they are used differently in cluster configurations they will be discussed
differently in this manual.
A DS-DWZZH-03 or DS-DWZZH-05 UltraSCSI hub can be installed in:
• A StorageWorks UltraSCSI BA356 shelf (which has the required
180-watt power supply).
Hardware Requirements and Restrictions 2–11