Item Description
Description Mirror disks (duplicated writes). Two disk drives, plus primary and
secondary disk drives, compose a RAID pair (mirr
oring 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 or
dinary 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.
RAID 1
Chapter 3: Hardware architecture
Hitachi Virtual Storage Platform G1000, G1500, and VSP F1500 Hardware Guide 62
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