Device led indicators – HP IO Accelerator for BladeSystem c-Class User Manual
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
)."
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.