Time required for a rebuild

The time required for a rebuild varies considerably, depending on several factors:

  • The priority that the rebuild is given over normal I/O operations (you can change the priority setting by using ACU)

  • The amount of I/O activity during the rebuild operation

  • The rotational speed of the drives

  • The availability of drive cache

  • The brand, model, and age of the drives

  • The amount of unused capacity on the drives

  • The number of drives in the array (for RAID 5 and RAID 6)

Allow approximately 15 minutes per gigabyte for the rebuild process to be completed. This period is a conservative estimate, and newer drive models usually require less time to rebuild.

System performance is affected during the rebuild, and the system is unprotected against further drive failure until the rebuild has finished. Therefore, replace drives during periods of low activity when possible.

CAUTION:

If the Online LED of the replacement drive stops blinking and the amber Fault LED glows, or if other drive LEDs in the array go out, the replacement drive has failed and is producing unrecoverable disk errors. Remove and replace the failed replacement drive.

When automatic data recovery has finished, the online LED of the replacement drive stops flashing and illuminates steadily.