Silicon Graphics Total Performance 9300, User Manual

Page: 47 / 120

Turning the Power On after an Unexpected Shutdown
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Turning the Power On after an Unexpected Shutdown
The enclosure (and the entire storage array) may shut down unexpectedly under the
following conditions:
• If the internal temperature of the enclosure exceeds the maximum operating
temperature (an overtemp condition). See the “Troubleshooting an Overtemp
Condition” section for more information on overtemp conditions.
• If there is a general power failure or a loss of power to the storage array.
• If you are forced to shut down the storage array without performing the normal
shutdown procedures (in “Turning the Power Off” on page 32) due to an emergency
situation.
Note that in each of these cases, some data may be lost.
Warning:
To avoid damage to the hardware, take special care when restarting the
enclosure after an unexpected shutdown.
If the enclosure shuts down unexpectedly, but there is still power to the site, use TPSSM
to determine if the enclosure has overheated.
• If an overtemp condition is indicated, follow the steps in “Turning the Power On
after an Overtemp Shutdown” on page 30 to restart the drive enclosure.
• If the enclosure has shut down due to a power failure or an emergency shutdown,
follow the steps in “Turning the Power On after an Emergency Shutdown” on
page 31 to restart the enclosure.
Troubleshooting an Overtemp Condition
If both fan units fail or are unable to maintain an internal temperature below 70 º C (158
º F), one or both of the power supplies in the enclosure will shut down. If both power
supplies shut down, the enclosure is inoperable.
TPSSM warns you if the temperature of the enclosure is rising (before it has risen
sufficiently to shut down the power supplies). The first warning comes when the
enclosure temperature exceeds 40
º C (104 º F). The enclosure shuts down if the
temperature rises above 70 º C (158 º F).