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appendix 1
What is raID?
RAID, short for Redundant Array of Independent Disks, is a combination of two or more disks with
the aim of providing fault tolerance and improving performance. There are several different levels
of RAID, with each providing a different method of sharing or distributing data amongst the drives.
The NAS server supports RAID levels 0, Linear and 1.
advanced definition of raid 0 and raid linear
raID
0
provides data striping, which spreads
out blocks of data over both drives, but does not
provide data redundancy.
Although performance is improved, the lack of
fault tolerance means that if one drive fails, all
data in the array will be lost.
raID linear
is much like RAID 0 except that data is
Stored randomly across the disks, not stiped
Simple definition of raid of raid 0 and raid linear
raID 0 and raID linear
puts disks together to create a
Larger storage capacity.
raID 0 and raID linear
is faster than using one disk as
parts of the data is stored on both disks. This option is not
as secure as
raID 1
as if one disk failsAll data is lost.
advanced definition of raid 1
raID 1
provides mirroring over both disks, with
the same read/write speed of a single disk.
A
raID 1
array can only be as large as it’s
smallest member disk.
Because the data is stored on both disks,
raID 1
provides fault tolerance and protection,
in addition to performance advantages
Simple definition of raid 1
raID 1
makes an identical copy of the data from disk 1 to
disk 2 so the same data is stored on both disks, this makes
this option more secure as if one disk fails, the other one is still operational. The failed disk can be
changed to a new disk and
raID 1
can be enabled on the new disk and the
raID 1
mirror
copy is redone and the data is secure again.