Raid1 (Mirroring); Raid5 (Striping With Parity) - Acer Veriton M661 User Manual

Intel Matrix Storage Manager Quick Guide for Acer Selected Veriton PC V1.1

RAID1 (mirroring)

• RAID1 creates an exact copy (or mirror) of a set of data on two or more
disks when reliability is more important than data capacity.
• A classic RAID1 mirrored pair contains two disks, which increases
reliability exponentially over a single disk.
o
Mirroring allows continued operation of the system in the event of
one drive or array failing.
o
Restoration can be performed using the mirrored copy.
o
I/O performance may suffer during reconstruction due to the increased
activity between locations.
• RAID1 volume capacity = capacity of smallest HDD
• Such an array can only be as large as the smallest member disk.
D is k 1
B lo c k 1
B lo c k 2
B lo c k 3
B lo c k 4
R A I D 1
D is k 2
B lo c k 1
B lo c k 2
B lo c k 3
B lo c k 4
P h y s ic a l d is k s
P h y s ic a l
P h y s ic a l
d is k s
d is k s
1 2 0 G B
1 2 0 G B

RAID5 (striping with parity)

• RAID5 uses block-level striping with parity data distributed across all
member disks.
• A RAID5 array can withstand a single disk failure without losing data or
access to data.
• RAID5 is a good all-round system that combines efficient storage with
excellent security and decent performance. It is ideal for file and
application servers.
• RAID5 volume capacity = [(number of HDDs) - 1] x (capacity of smallest HDD)
B lo c k 1
B lo c k 2
B lo c k 3
B lo c k 4
L o g ic a l d is k
L o g ic a l d is k s
1 2 0 G B
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