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RAID 1 (Mirroring)
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User's Manual
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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.
Figure 2. RAID 1
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) requiring very high availability.
Summary of Contents for Application Accelerator RAID Edition
Page 1: ...Intel Application Accelerator RAID Edition User s Manual Revision 1 1 July 2003 ...
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Page 10: ...Scope of This Document R 10 User s Manual This page is intentionally left blank ...
Page 12: ...RAID Background R 12 User s Manual This page is intentionally left blank ...
Page 14: ...RAID 0 Striping R 14 User s Manual This page is intentionally left blank ...
Page 16: ...RAID 1 Mirroring R 16 User s Manual This page is intentionally left blank ...
Page 18: ...RAID Migration Feature R 18 User s Manual This page is intentionally left blank ...
Page 24: ...BIOS Importance Settings R 24 User s Manual This page is intentionally left blank ...
Page 40: ...Intel RAID Option ROM R 40 User s Manual This page is intentionally left blank ...
Page 52: ...Issues During Installation R 52 User s Manual This page is intentionally left blank ...