Hitachi Virtual Storage Platform G1000 Hardware Manual page 58

Description
Advantage
Disadvantage
58
Hitachi Virtual Storage Platform G1000, G1500, and Virtual Storage Platform F1500 Hardware Guide
Item
Mirror disks (duplicated writes). Two disk drives, plus primary and secondary
disk drives, compose a RAID pair (mirroring pair) and the identical data is
written to the primary and secondary disk drives. The data is distributed on the
two RAID pairs.
RAID 1 is highly usable and reliable because of the duplicated data. It has
higher performance than ordinary RAID 1 (when it consists of two disk drives)
because it consists of the two RAID pairs.
Requires disk capacity twice as large as the user data.
Hardware architecture
Description