Status LEDs

Status LEDs are located on the control-panel earClosed A module located at the front right of the ztC Endurance system. It houses a USB 2.0 port, power button for the ztC Endurance system, and LEDs that indicate system power status (PWR), fault conditions (ATTN), and module identification status (UID). as well as the front of each CRU module. This topic illustrates and describes these LEDs. See Figure 28 and Figure 29, as well as Table 9, Table 10, Table 11, Table 12, and Table 13.

You can use the ATTN LEDs to diagnose faults, as described in Using the ATTN LEDs to Diagnose Faults .

Figure 28: Front LEDs: Storage Module, Control-panel Ear, and Compute Module

Table 9: Front LEDs: Storage Module
Callout LED State Description
1 Fault Off Normal operation.
Solid amber The disk is broken and safe to remove. See Removing and Inserting a Disk Drive.
2 ACT Off Idle or duplexed. Safe to remove.
Solid green Drive is present.
Blinking green Data is being written to or read from the disk.
3 PWR Off DC power and standby power to the module are off.
Solid green DC power to the module is on.
Blinking green Standby power to the system is on; DC power to the module is off.
4 UID Off

No request to identify module activated (normal operation).

To identify, see Identifying a System or Component.

Solid blue Request to identify module activated; LED illuminates with DC power or with standby power.
5 ATTN Off

Indicates one of two scenarios:

  • The module does not need to be replaced.

  • The module needs to be replaced, but the module is not safe to remove.

To determine which scenario is true, check the control-panel ear's ATTN LED. If that LED is not illuminated, no module in the system needs to be replaced.
Blinking amber

Fault; safe to replace the module. LED illuminates with DC power or with standby power.

To replace, see Removing and Replacing a Storage Module.

Table 10: Front LEDs: Control-Panel Ear
Callout LED State Description
6 PWR Off

DC power and standby power to the module are off.

To turn power on or off, press the power button on the control-panel ear or use the BMC. See System Power.

Solid green DC power to any module is on.
Blinking green Standby power is on; no module has DC power.
7 ATTN Off

Indicates one of two scenarios:

  • Standby power is off.

  • Standby power is on, but no compute module is inserted.
Solid green

Indicates one of two scenarios:

  • Standby power is on, at least one compute module is inserted, but the ztC Endurance Management VM is not running.

  • The ztC Endurance Management VM is running, all modules are present, and no modules need replacement.

Blinking amber

The ztC Endurance Management VM is running, and one or more modules are not inserted or need replacement.

Check LEDs of all modules to identify the module with a fault. For a list of modules, see System CRU Modules.

Note: After a total system shutdown, the ATTN LED remains in the last state it was in until you remove and restore standby power.
8 UID Off

No request to identify module activated (normal operation).

To identify, see Identifying a System or Component.

Solid blue Request to identify module activated; LED illuminates with DC power or with standby power.
Table 11: Front LEDs: Compute Module
Callout LED State Description
9 ATTN Off

Indicates one of two scenarios:

  • The module does not need to be replaced.

  • The module needs to be replaced, but the module is not safe to remove.

To determine which scenario is true, check the control-panel ear's ATTN LED. If that LED is not illuminated, no module in the system needs to be replaced.
Blinking amber

Fault; safe to replace the module. LED illuminates with DC power or with standby power.

See Removing and Replacing a Compute Module.

10 UID Off

No request to identify module activated (normal operation).

To identify, see Identifying a System or Component.

Solid blue Request to identify module activated; LED illuminates with DC power or with standby power.
11 PWR Off The module's DC power is off, and the other compute module's DC power is on.
Solid green The module has DC power (standby power is also on).
Blinking green The system has standby power only.

Figure 29: Rear LEDs: PSUs and I/O Module

Table 12: Rear LEDs: PSUs
Callout State Description
1 Off

No AC power to any PSU.
Solid green Output power is on.
Blinking green (1Hz) The PSU is in a standby state: AC power is present at only 12Vsb.
Blinking green (2Hz) PSU firmware is updating.
Solid amber

Indicates one of two scenarios:

  • The PSU has lost AC power (the AC cord might be unplugged); a second PSU still has AC power.

  • A PSU critical event is causing a shutdown because of a failure, overcurrent, short circuit, over-voltage, fan failure, over-temperature, or some other reason.

Blinking amber (1Hz)

The PSU is still operating, though it is experiencing a warning event such as a high temperature, high power, high current, or a slow fan.
Table 13: Rear LEDs: I/O Module
Callout LED State Description
2 PWR Off DC power and standby power to the module are off.
Solid green DC power to the module is on.
Blinking green Standby power to the system is on; DC power to the module is off.
3 ATTN Off

Indicates one of two scenarios:

  • The module does not need to be replaced.

  • The module needs to be replaced, but the module is not safe to remove.

To determine which scenario is true, check the control-panel ear's ATTN LED. If that LED is not illuminated, no module in the system needs to be replaced.
Blinking amber

Fault; safe to replace the module. LED illuminates with DC power or with standby power.

To replace, see Removing and Replacing an I/O Module.

4 UID Off

No request to identify module activated (normal operation).

To identify, see Identifying a System or Component.

Solid blue Request to identify module activated; LED illuminates with DC power or with standby power.
5 10 Gbps Link /ACT Off No link is present.
Solid green Link is stable.
Blinking green Data is being transferred over the link.
6 10 Gbps Speed Off No link is present.
Solid green Connection speed is 10 Gbps.
Solid amber Connection speed is less than 10 Gbps.
7 1 Gbps Link /ACT Off No link is present.
Solid green Link is stable.
Blinking green Data is being transferred over the link.
8 1 Gbps Speed Off No link is present, or link speed is less than 1 Gpbs.
Solid green Connection speed is 1 Gbps.

Using the ATTN LEDs to Diagnose Faults

The ATTN LED on the control-panel ear and on the CRU modules help you diagnose faults. A fault is an issue that requires module replacement, as opposed to other types of errors that occur on a module (for example, correctable errors below a certain threshold) that do not require module replacement.

The examples in Table 14 provide more information about using the ATTN LEDs to diagnose faults.

Table 14: Examples of Faults
ATTN LED Status Explanation

Control-panel ear ATTN LED is blinking amber.

For all modules, ATTN LEDs are off.

One or more of the modules needs replacement or is not inserted, but no module that needs replacement is safe to remove.

For example, compute module A may need replacement, but it may still be the active compute module.

Control-panel ear ATTN LED is blinking amber.

Compute module A ATTN LED is blinking amber.

For all other modules, ATTN LEDs are off.

Compute module A needs replacement, and it is safe to remove. One or more of the other modules may need replacement or may not be inserted, but no module that needs replacement is safe to remove.

For example, storage module A may need replacement, but it may contain a non-mirrored disk.

Control-panel ear ATTN LED is blinking amber.

I/O module B ATTN LED is blinking amber.

For all other modules, ATTN LEDs are off.

I/O module B needs replacement, and it is safe to remove. One or more of the other modules may need replacement or may not be inserted, but no module that needs replacement is safe to remove.

For example, compute module A may need replacement, but it may still be the active compute module.

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