Item
Description
Description Data is written to multiple disks successively in units of block (or blocks). Parity
data is generated from data of multiple blocks and written to disk.
Advantage RAID 5 is well suited to support transaction operations that mainly use small
size random access because each disk can receive I/O instructions
independently. It can provide high reliability and usability at a comparatively low
cost by virtue of the parity data.
Disadvantage Write penalty of RAID 5 is larger than that of RAID 1 because pre-update data
and pre-update parity data must be read internally as the parity data is updated
when data is updated.
56 Hardware architecture
Hitachi Virtual Storage Platform G1000, G1500, and Virtual Storage Platform F1500 Hardware Guide
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