Working on my COMPTIA A+ Cert. and I came across this topic. While I understand how it works, I don’t understand why you would use it over individual drives?
In: 1
Depends on the raid level.
Raid 0 is just spreading data among multiple drives, with the goal of improving speeds (since read/write tasks will be split among drives). However there is zero redundancy: a single drive loss will cause a complete loss of data.
Raid 1 is purely mirroring among drives: there is no performance improvement in write tasks since all data must be written identically to multiple drives. However even in a two drive array, a single loss results in no data loss.
Raid 5 is a bit of both: data is spread among drives, but the equivalent to one drive’s space is used for redundancy, allowing a single drive in a 3+ drive array to be lost without losing data.
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