RAID 1
The following two figures illustrate the RAID 1 configurations. The tables
following the figures describes each configuration.
Item
Description
Description
Mirror disks (duplicated writing). Two disk drives, 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.
Advantage
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.
Disadvantage
Requires disk capacity twice as large as the user data.
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Hardware architecture
Hitachi Virtual Storage Platform G1000, G1500, and Virtual Storage Platform F1500 Hardware Guide