HP IO manual Flashback substitution events, Software RAID and health monitoring

...

Media status: Healthy; Reserves: 100.00%, warn at 10.00%; Data: 99.12%

Lifetime data volumes:

...Physical bytes written: 6,423,563,326,064

...Physical bytes read: 5,509,006,756,312

The following Health Status messages are produced by the fio-statusutility:

•Healthy

•Low metadata

•Read-only

•Reduced-write

•Unknown

HP IO Accelerator Management Tool

In the Device Report tab, look for the Reserve Space percentage in the right column. The higher the percentage, the healthier the drive is likely to be.

SNMP

For details on how to configure SNMP health indicators, see "Setting up SNMP for Windows operating systems (on page 29)."

Flashback substitution events

The IO Accelerator is equipped with Flashback substitution capability. This capability allows for predictive NAND flash failures to occur and keep the IO Accelerator functioning by substituting out bad locations or even a whole NAND chip. The output of the fio-status–acommand will show if any flashback substitution events have occurred.

The following is an example of the output after entering the fio-status–acommand. The numbers represent the bank (0-3) and chip number that was substituted.

First flashback event -> No action to take as infant mortality condition on NAND chip was caught per design.

Second flashback event –> Run fio-bugreport. Return the card (if under warranty) when you see two or more flashback substitution events.

• Flashback active on (bank a/chip m) and (bank b/chip n) (multi-bank failure)

•Flashback active on (bank a/chip m) and (bank b/chip m) (chip failure)

On the second flashback event, include the output from running the fio-bugreportcommand when you return the card.

Software RAID and health monitoring

Software RAID stacks are typically designed to detect and mitigate the failure modes of traditional storage media. The IO Accelerator attempts to fail as gracefully as possible, and its new failure mechanisms are compatible with existing software RAID stacks. A drive in write-reduced mode participating in a write-heavy workload is evicted from a RAID group for failure to receive data at a sufficient rate. A drive in read-only

Monitoring IO Accelerator health 55