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RAID 5:
Combines three or more disks to create a storage space that is able to support one failed disk.
Should one of your disks fail, your data will still be protected from loss. In the event of disk
failure, simply replace the failed disk with a new one. The new disk will automatically be
accommodated into the RAID 5 configuration. The advantage of using RAID 5 is that is that it
provides data protection through data redundancy. The downside to using RAID 5 is that when
combining disks of differing sizes, the total storage space will be calculated based on the size of
the smallest disk.
Total available storage space = (size of smallest disk) * (total number of disks – 1)
RAID 6:
: Combines four of more disks to create a storage space that is able to support two failed disks.
Should two of your disks fail, your data will still be protected from loss. In the event of disk
failure, simply replace the failed disks with new ones. The new disks will automatically be
accommodated into the RAID 6 configuration. The advantage of using RAID 6 is that it is able to
provide superior data protection through data redundancy. The downside to using RAID 6 is
that when combining disks of differing sizes, the total storage space will be calculated based on
the size of the smallest disk.
Total available storage space = (size of smallest disk) * (total number of disks – 2)
RAID 10 (1+0):
Combines four or more disk to create a storage space that is able to support multiple failed disks
(as long as the failed disks do not belong to the same “mirrored set”). RAID 10 provides the
data protection of RAID 1 along with the access efficiency of RAID 0. With respect to data
protection, RAID 10 uses the RAID 1 method of having the exact same data written identically on
two disks, producing “mirrored sets”. These “mirrored sets” are then combined together in
a RAID 0 configuration. RAID 10 requires an even number of four or more disks. When
combining disks of differing sizes, the total storage space will be calculated based on the size of
the smallest disk.
Total available storage space = (size of smallest disk) * (total number of disks / 2)
See More
About RAID Scrubbing
NAS 251 – Introduction to RAID
NAS 352 – Online RAID Level Migration and Capacity Expansion