on 2014-10-26 22:24 Bipin Gupta wrote
b) You buy one pair of exactly the same hard drive - some enclosures allow you two pairs of hard drives increasing your storage capacity. So a pair of 4 TB hard drives will give you 4 TB storage space - NOT 8 TB - as the Raid array duplicates data on to the other drive - a safety insurance.
RAID is best suited to data that is critical to always be able to access — if one drive goes down you can keep operating without interruption; you describe RAID-1 (mirroring), which is at best no faster than a single hard drive (other types of RAID can have a significant speed advantage)
a key thing to know is that RAID is not backup; a conventional incremental backup is more secure and can be much less expensive; it does what RAID cannot — stores older versions of files that may have been later corrupted or accidentally deleted
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