HP IO Accelerator for BladeSystem c-Class Solaris User Manual download pdf (Page 20)

Monitoring and managing devices 20

Required actions

If the temperature is at or approaching the YELLOW condition, you must increase the cooling for your system.

This might include increasing the fan speed, bringing down the ambient temperature, reducing write load, or

moving the device to a different slot.

Health reserves percentage

IO Accelerator devices are highly fault-tolerant storage subsystems with many levels of protection against

component failure and the loss nature of solid-state storage. As in all storage subsystems, component failures

can occur.

By proactively monitoring device age and health, you can ensure reliable performance over the intended

product life. The following describes the Health Reserve conditions.

• GREEN: >10%

• YELLOW: 0-10%

• RED: 0%

At the 10% healthy threshold, a one-time warning is issued. At 0%, the device is considered unhealthy. It

enters write-reduced mode. After the 0% threshold, the device enters read-only mode.

For complete information on Health Reserve conditions and their impact on performance, see "Monitoring IO

Accelerator health (on page 33)."

Required actions

The device needs close monitoring as it approaches 0% reserves and goes into write-reduced mode, which

results in reduced write performance. Prepare to replace the device soon.

Flashback protection

Like many other memory devices, NAND flash eventually fails with use. Those failures can be either

permanent or temporary. Flashback redundancy is designed to address those chips that experience

permanent failures, and provides additional protection above and beyond ECC for soft failures.

Flashback provides a real-time RAID-like redundancy at the chip-level, without sacrificing user capacity or

performance for fault tolerance.

• GREEN: No Flashback indication

• YELLOW: Flashback indication

• RED: Failed Flashback indication

Required actions

The device functions normally in Flashback mode. Continue to monitor the device.

As a best practice, always back up your data on a regular basis. Flashback protection mode does not signal

impending failure, but it is a reminder that devices can fail, and that data is best protected with proper

redundancy.

If Flashback protection has failed, then the device is no longer usable. The device might need to be replaced.

Run the fio-bugreport utility and contact HP Customer Support.

Device LED indicators

The IO Accelerator device includes three LEDs showing drive activity or error conditions.

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HP IO Accelerator for BladeSystem c-Class Solaris User Manual Page 20