• When this LED is flashing, it indicates that the drive is actively reading or writing data.
• For SAS and SATA drives, this LED is off when the drive is powered but not active.
• For NVMe (PCIe) SSDs, this LED is on solid when the drive is powered but not active.
Note: The drive activity LED might be in a different location on the front of the drive, depending on the
drive type that is installed.
4 Drive status LED (yellow)
The state of this yellow LED indicates an error condition or the RAID status of the associated hard disk
drive or solid-state drive:
• When the yellow LED is lit continuously, it indicates that an error has occurred with the associated
drive. The LED turns off only after the error is corrected. You can check the CMM event log to
determine the source of the condition.
• When the yellow LED flashes slowly, it indicates that the associated drive is being rebuilt.
• When the yellow LED flashes rapidly, it indicates that the associated drive is being located.
Note: The hard disk drive status LED might be in a different location on the front of the hard disk drive,
depending on the drive type that is installed.
5 Power button/LED (green)
When the compute node is connected to power through the Lenovo Flex System chassis, press this
button to turn on or turn off the compute node.
Note: The power button works only if local power control is enabled for the compute node. Local power
control is enabled and disabled through the CMM power command and the CMM web interface.
• For more information about the CMM power command, see the Flex System Chassis Management
Module: Command-Line Interface Reference Guide at http://flexsystem.lenovofiles.com/help/topic/
com.lenovo.acc.cmm.doc/cli_command_power.html.
• From the CMM web interface, select Compute Nodes from the Chassis Management menu. For
more information, see the "Flex System Chassis Management Module: User's Guide" at http://
flexsystem.lenovofiles.com/help/topic/com.lenovo.acc.cmm.doc/cmm_user_guide.html. All fields
and options are described in the CMM web interface online help.
After the compute node is removed from the chassis, press and hold this button to activate the system-
board LEDs (light path diagnostics). See “Viewing the light path diagnostics LEDs” on page 97 for more
information.
This button is also the power LED. This green LED indicates the power status of the compute node:
• Flashing rapidly (Four times per second): The LED flashes rapidly for one of the following reasons:
– The compute node has been installed in a powered chassis. When you install the compute node,
the LED flashes rapidly while the XClarity Controller in the compute node is initializing and
synchronizing with the Chassis Management Module. The time required for a compute node to
initialize varies by system configuration.
– Power permissions have not been assigned to the compute node through the Chassis
Management Module.
– The Lenovo Flex System chassis does not have enough power to turn on the compute node.
– The XClarity Controller in the compute node is not communicating with the Chassis Management
Module.
The power LED blink rate slows when the compute node is ready to be turned on.
• Flashing slowly (One time per second): The compute node is connected to power through the
Lenovo Flex System chassis and is ready to be turned on.
12
ThinkSystem SN550 Compute Node Maintenance Manual
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