MS-6728 ATX Mainboard
B-4
What is RAID 1 (mirroring)?
A RAID 1 array contains two hard drives where the data between the
two is mirrored in real time. Since all of the data is duplicated, the operating
system treats the usable space of a RAID 1 array as the maximum size of one
hard drive in the array. For example, two 40 GB hard drives in a RAID 1 array
will appear as a single 40 GB hard drive to the operating system.
The primary benefit of RAID 1 mirroring is that it provides good data
reliability in the case of a single disk failure. When one disk drive fails, all data
is immediately available on the other without any impact to the data integrity.
In the case of a disk failure, the computer system will remain fully operational
to ensure maximum productivity.
The performance of a RAID 1 array is greater than that of a single drive
since data can be read from multiple disks simultaneously, although disk
writes do not realize the same benefit as is the case with RAID 0.
Minimum Disks: 2
Advantage: 100% redundancy of data. One disk may fail, but data
will continue to be accessible. A rebuild to a new disk is
recommended to maintain data redundancy.
Redundancy: Excellent - disk mirroring means that all data on one disk
is duplicated on another disk.
Application: Typically used for smaller systems where capacity of
one disk is sufficient and for any application(s) requir-
ing very high availability.
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