MG9082 - Typical Slot Drive States

Typical Slot Drive States

  • ON-LINE - This is the normal operating condition for a drive. There is no failure detected and the drive can be accessed.
  • ACTIVITY - This LED either turns on when a drive is installed and blinks OFF with activity. This is done so that the single LED can both indicate that the slot is populated as well as the actual activity to the slot.
  • FAIL - A solid Red LED indicates a drive that has failed, and is no longer operational. The failure would most likely be a result of data that was unsuccessfully read from or written to the drive. This condition will remain until the drive is replaced or rebuilt. One can also manually "Fail" a drive, which is useful in testing, in which case there is nothing physically wrong with the drive. A manually failed drive can be rebuilt and brought back on-line.
  • REBUILDING - A drive that is part of a RAID-array can be rebuilt, which means that the data on the drive is in the process of being restored from redundant media. If the rebuild succeeds, the drive becomes ON-LINE after the Rebuild. If the rebuild is terminated or fails, the drive will become FAILed.
  • PREDICTED FAILURE - A drive may successfully write data after a number of failed attempts. This case could be an indication that the storage medium is going bad.

An HBA or RAID Controller can query the drive for such problems, and flag the drive with the prediction that it could fail in the near future, although it is currently operational. This can be indicated i.e. by a fast blinking Red LED.

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