| Activity : RAID Discs | |||||||||||||||||||||||||||||
| An exercise about how RAID discs store their data. | |||||||||||||||||||||||||||||
| RAID stands for Redundant Array of Independent Discs (it
used to be Redundant Array of Inexpensive Discs).
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| A RAID drive has a number of hard discs and data is stored on all of them. This results in an increase in reliability and so is often used on file servers. | A number of different systems of data storage are used - the system used is designated as a 'Level'. The levels are called RAID 0 to RAID 6 | ||||||||||||||||||||||||||||
| A simplified example :
(reality is much more complex!)
Data is stored on three discs - Discs 1,2 and 3. The data on Disc 3 is the sum of the data stored on Discs 1 and 2. The table below shows 8 bytes of data stored on each of these discs... |
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On another part of the discs there have been some problems and some of the data is unreadable (marked as 'XX'). |
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| [1] | What are the three unreadable numbers?
If you can work them out then so can the computer - This is why RAID drives are so reliable. Data will not easily be lost. |
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| Enter your answers and check them:
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