Improving UltraSCSI RAID Subsystem Operation

This document, "Improving UltraSCSI RAID Subsystem Operation," updates the procedures for setting temperature sensors in DIGITAL DS-BA370-series UltraSCSI enclosures.

Key points include:

• Default Set Points: Recommends specific temperature set points: 41°C (106°F) for the EMU (intake) sensor and 48°C (118°F) for the two backplane (exhaust) sensors.
• Sensor Types & Setting: Explains there are three sensors (two backplane exhaust, one EMU intake). Users can set overtemperature conditions in whole degrees Celsius (0-49°C) using specific CLI commands (set emu sensor_N set point=XX).
• Expansion Configuration: In an expansion setup, only the master EMU temperatures are set, and other enclosures automatically match.

• Rules for Custom Settings: If setting custom temperatures, strict rules apply:

  • All entries must be in whole degrees Celsius.
  • The EMU set point must be at least 6°C (11°F) higher than the highest expected ambient temperature.
  • The two backplane set points must be identical and at least 13°C (23°F) higher than the highest expected ambient temperature.

• Caution: Warns against using the set emu sensor_n set point=default command, as it sets the temperature too low, causing erroneous subsystem alarms.

• Conversion Table: Includes a table for converting Celsius to Fahrenheit.