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INTRODUCTION
30
1 Also known as mirroring
All data replicated on N sepa-
rated disks.
N is almost always 2.
This is a high availability solu-
tion, 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
Reads
are
higher
than a
single
disk;
Writes
similar
to a
single
disk
Reads are
twice as fast
as a single
disk;
Write are
similar to a
single disk.
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
more
similar
to RAID
1 than
RAID 0
Reads are
twice as fast
as a single
disk;
Writes are
similar to a
single disk.
3 Also known Bit-Interleaved Par-
ity.
Data and parity information
is subdivided and distributed
across all disks. Parity data
consumes the capacity of 1
disk drive. Parity information
normally stored on a dedicated
parity disk.
3 Lower
than
RAID 1,
1E, 6;
Higher
than a
single
drive
Reads
are
similar
to
RAID
0;
Writes
are
slower
than a
single
disk
Reads are
close to being
twice as fast
as a single
disk;
Writes are
similar to a
single disk.
5 Also known Block-Interleaved
Distributed Parity.
Data and parity information
is subdivided and distributed
across all disk. Parity data con-
sumes the capacity of 2 disk
drive.
3 Lower
than
RAID 1,
1E, 6;
Higher
than a
single
drive
Reads
are
similar
to
RAID 0;
Writes
are
slower
than a
single
disk
Reads are
similar to
RAID 0;
Writes are
slower than a
single disk.