Single-Ended I/O Modules
UltraSCSI RAID Enclosure 5–7
Rules for Expanding an UltraSCSI Bus
By connecting the master enclosure to one or two expansion enclosures, you
can expand the SCSI bus from a 4-device bus to an 8-device or 12–device
bus. See Chapter 4, “Power Verification and Addressing Assembly,” for a
discussion of the valid enclosure SCSI bus addresses and the associated
array controller and storage device SCSI bus IDs.
___________________ Caution _____________________
The UltraSCSI bus can support a maximum of 16 devices (2
array controllers and 14 disk drives), However, DIGITAL does
not support any configuration with more than 12 disk devices.
This precludes creating device ID conflicts between the array
controllers and the disk drives, or between disk drives.
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To expand a SCSI bus, use the 68-pin VHDCI receptacle connectors on the
I/O module and a BN37A–series cable. See Table 5–2 for a list of the rules
for expanding and UltraSCSI bus.
___________________ Caution _____________________
The DIGITAL UltraSCSI controller does not support connecting
or disconnecting a SCSI bus when both data and power are
present on the connector, a "hot swap." You can only connect
or disconnect SCSI bus cables using the cold swap method.
To replace a cable, (1) Clear the cache module. (2) Shut down
the array controller, and (3) turn off the enclosure power before
removing an I/O module.
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_____________________ Note ______________________
Connecting a cable to the right I/O module connector removes
the external SCSI bus termination from the module.
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Summary of Contents for StorageWorks UltraSCSI DS-BA370 Series
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