RA7000 and ESA10000 Storage Subsystems
1–16
EK–SMCPP–UG. A01
The PVA has two status indicators:
•
The green power status LED in the power Shut down switch. This LED is
ON whenever there at least four operational power supplies. When an error
condition occurs, the LED is OFF and the PVA reports the error to the
EMU. The EMU also monitors the power supplies for this condition
•
An audible alarm that beeps at a slow rate when the PVA detects removal of
or improper installation of the EMU. This ensures you are aware the EMU
must be replaced within 8 minutes to prevent a system shut down
The primary functions of the PVA include the following:
1) Ensures that there is a minimum of four operational power supplies in the
enclosure. If the PVA senses less than four power supplies, it notifies the
EMU.
2) Allows the user to select the DIGITAL-supported device SCSI bus
addresses for the master and each expansion enclosure.
3) Monitors the EMU status and:
•
Notifies the user of removal of the EMU
•
Notifies the user when there is no master EMU
•
Notifies the user when there are multiple master EMUs
•
Provides the user a switch to disconnect dc power from the enclosure
power buses
•
Monitors the optional UPS for proper operation and reporting the UPS
status
1.3.3.1 Monitoring Power Supply Operation
For accurate, reliable transfer of data without data corruption or loss, the
enclosure requires a minimum of four operational power supplies to furnish both
+5 and +12 Vdc for operation of the following:
•
Storage Devices (SBBs)
•
Controllers and cache memories
•
EMU
•
PVA
Содержание ESA10000
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