Qubex User Guide
Page 8
RAID 0
RAID 0, also referred to as striping, writes stripes of data across multiple disk drives. RAID 0
does not provide any data redundancy, but does offer the best high-speed data throughput. RAID
0 breaks up data into smaller blocks and then writes a block to each drive in the array. Disk
striping enhances performance because multiple drives are accessed simultaneously; but the
reliability of RAID Level 0 is less than any of its member disk drives due to its lack of
redundancy.
RAID 1
RAID 1 also known as “disk mirroring”, means that data written to one disk drive is
simultaneously written to a second disk drive. Read performance may be enhanced if the array
controller can simultaneously access both members of a mirrored pair. During writes, there will
however, be a minor performance penalty when compared to writing to a single disk as two
writes must occur (one to each disk drive). If one drive fails, all data (and software applications)
is preserved on the other drive. RAID 1 offers extremely high data reliability, but at the cost of
doubling the required data storage capacity.
