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RAID 1 (Safe)
RAID1 allows the enclosure to automatically copy data to both hard
drives. It stores all data in duplicate on separate drives to protect
against data loss due to drive failure. It provides the highest level of
data protection for critical data that you cannot afford to lose if a hard
drive fails. The capacity is equal to the smaller of the two hard drives.
If one drive fails, the SAFE volume is still usable, but it is in
a vulnerable state because its mirror (duplicate) hard drive is
inaccessible. When the offline drive comes back online, the enclosure
will begin the rebuild process immediately, to restore data redundancy.
Although the volume remains available during the rebuild process, the
volume is susceptible to data loss through damage to the remaining
drive until redundancy is restored at the end of the rebuild/verification
process. Host access takes precedence over the rebuild process, so
if you continue to use the SAFE volume during the rebuild, the rebuild
process will take longer to complete, and the data transfer performance
will also be affected.
NOTE: Under “Safe Mode”, if Drive B would start to Rebuild, the Link
LED of Drive B would start to flash.