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Server RAID System [ R2-RAID ] User Manua
13
l
RAID 1 (Safe)：It allows
the device automatically
to copy data to both
hard drives. It stores all
data in duplicate on
separate drives to p
against
rotect
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 mirrored hard drive is inaccessible. When the offline drive comes
back online, the appliance begins a 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 and verification process. Host
access takes precedence over the rebuild process. If you continue to use the
SAFE volume during the rebuild, the rebuild process will take a longer time to
complete, and the host data transfer performance will also be affected.
Drive A
250GB
Drive B
250GB
HD3206SRD
Port 0 Port 1
Equal hard drives
Drive A
250GB
Drive B
750GB
HD3206SRD
Port 0 Port 1
Safe
250GB
Safe
250GB
Unequal hard
drives