47
RM16_EX8
User
Guide
v1.0
‐
DATOptic.com
Protection
Very
High
Very High
for
Both Reads
and Writes
•
RAID 6
RAID 6 provides the highest reliability. It is similar to RAID 5, but
it performs two different parity computations or the same computation
on overlapping subsets of the data. RAID 6 can offer fault
tolerance greater than RAID 1 or RAID 5 but only consumes the
capacity of 2 disk drives for distributed parity data. RAID 6 is an
extension of RAID 5 but uses a second, independent distributed
parity scheme. Data is striped on a block level across a set of
drives, and then a second set of parity is calculated and written
across all of the drives.
1 Also known as mirroring
All data replicated on N separated
disks.
N is almost always 2.
This is a high availability solution,
but due to the 100%
duplication, it is also a costly
solution. Half of drive capacity in
array devoted to mirroring.
2 Lower
than
RAID 6;
Higher
than
RAID
3, 5
Writes
similar
to a
single
disk
Reads are
twice as fast
as a single
disk;
Write are
similar to a
single disk.
10(1E) Also known Block-Interleaved
Parity.
Data and parity information
is subdivided and distributed
across all disks. Parity must be
the equal to the smallest disk
capacity in the array. Parity
information normally stored on a
dedicated parity disk.
3 Lower
than
RAID 6;
Higher
than
RAID
3, 5
Transfer
rates
