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Figure 35 Fan LEDs
The two fan modules are physically identical, but their control is not. The Fault/health LED on FAN
1 is a single bi-color LED controlled by the EMU via the Health Monitor – it is either off, steady
green, or flashing amber. The lens of the fan LED is colorless and looks grayish-white when off.
System Fan — Fan 1
Fan 1 LED is driven by the EMU firmware. The fan microprocessor inside the Fan module cannot
sense or control this LED. If the EMU fails, or if the connection between the EMU and the fan fails,
the LED cannot be controlled and thus may not reflect actual state. Also, because Fan 1 LED has
no power unless enclosure power is on, the EMU cannot indicate Fan status in standby mode.
There is no autonomic hardware circuit controlling the FAN Fault LED. Assuming the LED is working,
it flashes Amber by the EMU if one or two of the 3 fan rotors is not functioning, or if the
microprocessor on the fan module is unresponsive, or if code on the module is unreadable.
Drive Fan — Fan 2
The Fault/health LED on FAN 2 is not controlled at all by the EMU – but is controlled by one of
the management processors inside the SAS I/O Module. This LED cannot be lit unless enclosure
power is on, and its state depends upon signals from one of the SAS I/O modules.
To troubleshoot a degraded fan, you can use the EMU CLI commands SHOW ENCLOSURE STATUS
and SHOW ENCLOSURE FAN ALL described in
EMU CLI SHOW commands
Use the EMU CLI SHOW commands described in
information about component status as indicated by the hardware LEDs described in
LEDs" (page
34). To access the CLI, log in to the EMU as Administrator.
The system is shipped with a single enabled user account: Administrator. The password of the
Administrator account is unique, programmed at the factory, and printed on the tear-away label
on the back of the unit and the label on top of the EMU. Logging in to the system requires the
Secure Shell protocol (SSH). Windows systems can use ssh clients such as PuTTy, which can be
freely downloaded.
To log in to the EMU:
1.
Note the IP address of the EMU.
2.
ssh to the EMU.
3.
Log in as Administrator.
The following is a sample login session:
login as: Administrator
-----------------------------------------------------------------------------
WARNING: This is a private system.
authorized user.
tored and can result in criminal or civil prosecution under applicable law.
42
Monitoring and troubleshooting the storage system
Do not attempt to login unless you are an
Any authorized or unauthorized access and use may be moni-
"Managing the EMU" (page
"Managing the EMU" (page 131)
131).
to obtain additional
"Component
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