RAID, is Redundant Array Indenpent Disk, what is RAID 0?

For RAID 0, is a technology which split the data evenly across 2 or more hard drive (striped), with no parity information for redundancy. RAID 0 is not an original RAID levels and it provides no data redundancy.In RAID 0, minimum hard disk will be 2.

Advantage:
To create a larger virtual hard drive with a lot of smaller physical hard drive. Meaning that if the market current largest hard disk size is 2 Tera Bytes, while the server can shows 20 tera bytes hard as a single hard disk, but originally is combine of 20’s 2 tera bytes physical hard drive.

Unfortunately, if you using different size of hard drive, only minimum hard drive space will be apply. Example, you using 1 Tera hard drive striped with another 2 tera hard drive, the final hard disk space will be 2 tera only.

Other then this, according to the theory, RAID 0 also improve performance. How to RAID 0 increase performance?

As we can see on above diagram, the data are split to different hard drive. The minimum hard drive is 2. Lets imagine if a file with 1000MB, write to 1 hard drive require 10minute, with using RAID 0, imagine there are 4 physical hard drive, now require 2.5minute to write this 1000MB file into the hard drive.

Same to reading the file or copying the files.

Disadvantage:

No data redundancy, since the data are evenly split between all the hard drive, once of the hard disk fail, will bring all your data to hell.

Suggestion:

Some said purchase another external hard drive, and schedule a weekly or daily backup of the data to the external drive.

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