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ACS-9910 User's Manual
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The ACS-9910 can support the following RAID levels: 0, 1, 3, 5 and 0+1.
Which is the right level for you? The answer depends on the application you use your RAID
for.
RAID Level 0 offers high transfer rates, and is ideal for large blocks of data where speed is of
importance. Computer Aided Design, Graphics, Scientific Computing, Image and Multimedia
applications are all good examples. If one drive in a RAID 0 array fails however, the data on
the whole array is lost.
RAID Level 5 arrays offer high I/O transaction rates, and are the ideal choice when used with
on-line transaction processing applications, such as those used in banks, insurance
companies, hospitals, and all manner of office environments. These applications typically
perform large numbers of concurrent requests, each of which makes a small number of disk
accesses. If one drive in a RAID 5 array fails, the lost data can be rebuilt from data on the
functioning disks.
RAID Levels 3 and 5 both offer a good level of fault tolerance and overall system reliability at
a reasonable cost for redundancy overhead.
RAID Level 1 may be an appropriate choice if cost and performance are of significantly less
importance than fault tolerance and reliability.
RAID Level 0 may conversely be a suitable choice if fault tolerance and reliability are not
important.
This appendix provides a summary of the features of each RAID level to enable users with
differing requirements to makes the best choice.
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