Power Verification and Addressing (PVA)
UltraSCSI RAID Enclosure 4–5
Use the PVA address switch to establish SCSI bus IDs for all the devices on
the same shelf. This switch has eight (0 through 7) positions.
Always set the master enclosure switch is to 0.
Monitoring Power Supply Operation
Even when there are four operational power supplies, it is possible that a
power supply problem will cause one or both of the dc voltages to be too
low. Both the PVA and the EMU monitor power supply operations to ensure
that the dc voltages are within the ranges specified in Table 4–1
Table 4–1 DC Voltage Ranges
Nominal Voltage
+ 5 V dc
+ 12 V dc
Minimum Voltage
+4.7 V dc
+ 11.4 V dc
When there are at least four operational power supplies both the minimum
voltages, which are sufficient to run the system, will be present. Fewer than
four operational power supplies cannot maintain the minimum voltages.
Should this occur, the EMU will notify the array controller. The EMU can
automatically initiate the standby power mode.
_____________________ Note ______________________
Only the EMU monitors the system dc voltages and the I/O
5 V dc TERMPOWER. The PVA only monitors the
system dc voltages.
________________________________________________
Summary of Contents for StorageWorks UltraSCSI DS-BA370 Series
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