a. Redundant Array of Independent Disks (RAID) level 1 scheme: RAID’s are a number of hard disks which store exact same data. Different RAID levels are available from 1 to 10, each with different significance. The scheme for getting the effect of atomic block writes with the RAID level 1 (mirroring) is shown below: A block write operation is performed as follows, to secure atomicity. Write the information onto the physical block which is located first. Write the similar information onto the physical block located at the second, when the first write accomplishes successfully. Only after the second write accomplishes successfully, the output is announced. Each set of “2” physical blocks is tested during recovery. Further process is not required if both are same and there is unnoticeable partial-write...

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Chapter 12, Problem 6PE

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a.

Redundant Array of Independent Disks (RAID) level 1 scheme:

RAID’s are a number of hard disks which store exact same data. Different RAID levels are available from 1 to 10, each with different significance.

The scheme for getting the effect of atomic block writes with the RAID level 1 (mirroring) is shown below:

A block write operation is performed as follows, to secure atomicity.

Write the information onto the physical block which is located first.

Write the similar information onto the physical block located at the second, when the first write accomplishes successfully.

Only after the second write accomplishes successfully, the output is announced.

Each set of “2” physical blocks is tested during recovery.

Further process is not required if both are same and there is unnoticeable partial-write...

Explanation of Solution

b.

Redundant Array of Independent Disks (RAID) level 5 scheme:

RAID’s are a number of hard disks which store exact same data. Different RAID levels are available from 1 to 10, each with different significance.

The scheme for getting the effect of atomic block writes with the RAID level 5 (block interleaved, distributed parity) is shown below:

Initially, the data is written in the information block.

Once this write is successful, the same data is written into the related parity block.

The write is considered successful only when both the writes are successfully completed...

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