Asus M3A78-EMH HDMI - Manual (Page 92)

RAIDXpert User Manual
86
Managing a Critical or Offline Logical Drive
A fault-tolerant logical drive—RAID 1, 5, or 10—goes Critical when a physical
drive is removed or fails. Due to the fault tolerance of the logical drive, the data is
still available and online. However, once the logical drive goes critical, it has lost
its fault tolerance and performance may be adversely affected.
If the fault was caused by a failed physical drive that was removed, the drive
must be replaced by another drive, either identical or larger, in order for the RAID
system to rebuild and restore optimal configuration.
A non-fault tolerant logical drive—RAID 0 or JBOD—goes Offline when a
physical drive is removed or fails. A RAID Ready logical drive, which has only
one physical drive, disappears from the interface if the physical drive is removed
or fails. Since these logical drives are not fault tolerant, the data stored in the
logical drive is no longer accessible.
If one physical drive fails, all of the data on the logical drive is lost. You must
replace the failed drive. Then, if the logical drive had more than one physical
drive, delete the logical drive, and re-create it. Restore the data from a backup
source.
If you created a backup drive for your RAID Ready logical drive, the use the
backup drive to restore the data. See “Backing up a RAID Ready Logical Drive”
on page 71.