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14 Cards in this Set
- Front
- Back
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What does RAID stand for? |
Redundant Array of Inexpensive Disks |
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What is one HDD limited too? |
One read/write at a time, One interface |
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What happens if the discs in an array are different sizes? |
They will all be reduced to the size of the smallest disk |
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What is a disadvantange of multi disk systems? |
The more disks you have the more likely one will fail |
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What is level 0 RAID? |
Uses two or more disks, which spread files accross all the disks in the array |
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What is an advantage of RAID 0? |
Good for performance, the read/write performance will increase for every disk added to the array |
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What is a disadvantage of RAID 0? |
If one of the disks fails - all data is lost, High risk/Low reliability |
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What is RAID 1? |
Disk Mirroring, All data is written twice - once to each disk, two copies of all the data |
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What is an advantage of RAID 1? |
Read performance is slightly faster as there is two copies to read from and High reliability |
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What is a disadvantage of RAID 1? |
Write performance is slightly slower and low efficiency |
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What is RAID 5? |
Similar to RAID 0 except 3 disks are used as parity |
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How does RAID 5 work? |
Uses XOR to spread the parity across the disks |
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What are the advantages of RAID 5? |
Read performance is better than a single disk, One disk can fail without data loss |
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What are the disadvantages of RAID 5? |
Write performance is poor, poor efficiency |
