In 2008, Zhongguancun learning data recovery ever systematic study of the entire column disk RAID, today often encountered when doing business after ten years of operation and maintenance, to help sort out today for everyone to learn together and progress.
RAID disk array 2019.6.17
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1.RAID-0: strinping (stripe pattern), at least two fast disk, the partition size is preferably the same RAID (which can give full play to the advantages of concurrently); dispersing data stored on a different disk, when reading and writing can be achieved concurrently, all the reading and writing performance relative to its best; but there is no fault tolerance, any damage to a disk all the data will be corrupted ; 100% disk utilization;
(seniors borrow a map for everyone to see, Figure I)
2.RAID-1: mirroring (mirrored), at least two hard drives, raid raid partition size is equal to two smallest capacity (preferably partition into the same size), redundant data, while writing on storage the two hard drives, to achieve the data backup; disk utilization is 50%, i.e., a hard disk RAID1 2 provides only fast 100G 100G available space.
(FIG predecessors borrow again, Figure II)
3.RAID-5: requires three or more hard disk drives, can be provided to achieve hot spare recovery; only one is damaged, there is no problem. But if also damaged two disks, the data will be corrupted. Utilization: (n-1) / n
Tutorials must be strict, otherwise it will be fraught.