ACTi INR-410 INR-420 V3.0.09 - Manual (Page 30)

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INR-410/420 System Administrator’s Manual
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Hardware RAID (for INR-420 Only)
With the purpose of achieving better performance and interoperability, INR-420 is also
designed with hardware RAID which does not require CPU resources to run the RAID task.
Besides JBOD, RAID 0 and RAID 1, INR- 420’s hardware RAID also supports RAID 5 and
RAID 10. The introductions of these two RAID types are as follows.
Introduction of RAID 5, RAID 10 and RAID 50
RAID Type Description
RAID 5 RAID 5 is probably the most popular configuration of all because it
provides both disk recovery options and quite efficient use of storage
space. Furthermore, the more hard disks you add into RAID 5
configuration, the faster will be the writing and reading speed, for the
similar reason as in case of RAID 0. In RAID 5 configuration, the data
blocks are considered the same data group or a stripe. Certain special
portion of data that is created based on the values of other data blocks for
recovery purposes. Such value is called parity. The parity information is
distributed and stored across each
hard drive. If any of the hard drive
fails, the array enters downgrade
mode, all that you need to do is
replace the failed disk with a new
one.
RAID 10 RAID 10 (also called 1+0)
combines RAID 1 and RAID 0
configurations – think of it as a
group of mirrored disks. From that it
is possible to conclude that there
has to be even number of disks and
at least two pairs.