Dell PowerVault MD1220 Техническое руководство - Страница 15
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Item
Indicator, Button, or
Connector
Enclosure Failover When Two EMMs are Installed
If two EMMs are installed, a certain degree of failover is offered. Control and monitoring of the
enclosure elements can be transferred from one EMM to another in the event of an EMM failure. A
failover occurs whenever communication is lost between an EMM and its peer. In the event of a peer
EMM failure, the surviving EMM activates the amber status LED of the failed EMM. The surviving EMM
then takes over the responsibility of enclosure management, which includes monitoring and control of
the audible alarm, enclosure LEDs, power supplies, and fans. When a failed EMM is replaced,
enclosure management functions do not automatically return to the replaced EMM unless an additional
failure occurs that triggers another failover event.
Note: When the enclosure is configured with dual EMMs in a redundant path configuration, all drives
are still accessible, even after an EMM failure, since the EMMs are joined mode via the PERC H800
redundant path. When the enclosure is configured in split mode, only half of the drives are accessible
in the event of an EMM failure.
EMM Thermal Shutdown
If critical internal temperatures are reached, the enclosure shuts down automatically through either a
thermal shutdown command issued by the EMM firmware or through a command from Dell™™
OpenManage™ Server Administrator (OMSA).
Enclosure Alarms
An audible alarm is activated if any of the fault conditions listed below occur. The alarm sounds
continuously if:
• More than one fan has failed or a power supply/cooling fan module is not installed.
• One or more temperature sensors are in critical range.
The alarm sounds every 10 seconds if:
• One power supply has failed.
• One cooling fan has failed.
• One or more temperature sensors are in warning range.
• One EMM has failed.
NOTE: The alarm is disabled by default. To enable the alarm, change the default setting in OMSA. For
more information, see the OMSA documentation.
** Available in Q3 2010
EMM INDICATOR AND FETAURE DESCRIPTION
Icon
update is in progress.
Blinks amber (On 250 ms Off 250 ms [two times]; Off 1000 ms)
when the enclosure is unable to communicate with enclosure
devices.
Blinks amber (On 250 ms *Off 250 ms [four times]; Off 1000 ms)
when a
firmware update fails.
Blinks amber (On 250 ms Off 250 ms [five times]; Off 1000 ms)
when the firmware versions are different between two EMMs in
an enclosure.
*indicates that the LED blinks fast.
+indicates that the LED blinks slowly.
Description
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