A RAID 1 configuration provides only data protection by copying data
from one drive to another. Data is fully protected as the mirror copy is
available if the originating drive is disabled or unavailable. Because
it makes a full duplicate of the data, the RAID 1 requires twice as much
storage capacity as required by the original data.
RAID 0 doesn't provide any data protection; its sole purpose is to
enhance drive access performance. It does that by spreading the data out
across two or more drives so that multiple read/write heads on the
drives can write or access portions of data simultaneously, thus
speeding up overall processing.
RAID 10 provides data
redundancy
and improves performance, and is the a good option for I/O-intensive
applications -- including email, web servers, databases and operations
that require high disk performance -- and organizations that require
little to no downtime.
The high performance of RAID 10, and its ability to speed up both
write and read activities, makes it suited to highly used,
mission-critical database servers. However, the four-disk minimum
requirement makes RAID 10 a costly choice for smaller computing
environments, as it entails a 100% storage capacity overhead, which may
be overkill for small businesses or consumer use.
