D-Link ShareCenter Quattro DNS-345 User Manual page 251

Section 4 - Configuration
D-Link ShareCenter Quattro DNS-345 User Manual
RAID 1 lets you assign two disks as a mirrored set.
Once you create the mirrored set, you will see it
as a single disk drive. But when you write data to
the mirrored set, it will duplicate the data across all
members of the set. This ensures that your data is
protected against loss if any hard drive in the RAID
1 set fails. In fact, as long as any single member
of the set remains functional, you will continue to
operate normally, with complete access to your
data.
RAID 5 is another striping RAID level, designed to
increase the speed of disk reads and writes. RAID
5 provides drive failure tolerance, allowing any
single drive in the array to fail without losing any
data in the array. When a drive fails, the RAID 5
array can still be used to read or write data. Once
the failed drive is replaced, the RAID 5 array can
enter a data recovery mode, where the parity data
in the array is used to rebuild the missing data on
the newly installed drive.
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