Question 1. You have been tasked to implement a disk fault tolerance strategy for your company. The disk set should make the most efficient use of disk space and it should also have the fastest access time of all the fault tolerance disk sets under Windows NT. What disk set should you implement?
a . Disk striping without parity.
b. Volume set
c. Disk duplexing
d. Disk striping with parity
Disk mirroring ( duplexing ) only make use of 50% of disk space. Therefore, you can eliminate C. Disk striping without parity and volume sets do not provide any fault tolerance. Of all of Windows NT's fault toelerance disks sets, Disk striping with parity prvodies the most efficient use of disk space. It, along with disk striping without parity, provides the fatest read operations of all of NT's disk sets.
Question 2. You need to implement a disk fault tolerance strategy for your company.
Optional results : The boot partition must be part of the disk set. Disk write operations must be optimized.
Proposed soulition : Implement disk striping without parity.
Which results does the proposed solution produce?
a. The proposed solution produces the required result and the optional results.
Although, it is always a good practive to map the proposed solution to the optional results, there are some instances when mapping the proposed solution to the required result is useful. You should do step 2 first only if the presented required result is simple, like in this scenario. By doing step 2 first in this question, the required result is not satisified. When the required result is not satisifed, then the only possible answer is D. Disk striping wihtout parity does not provide any fault tolerance. Therefore, if one or more member fails in the set, disk operations cannot continue. The required result is not satisified.
Question 3. Your company is currently using disk mirroring. You have been tasked to implement a new fault tolerance strategy.
Required result : Disk operations must be able to continue if two members fail.
Optional results : Read operations should be faster than disk mirroring. The system and CPU overhead should be less than disk mirroring.
Proposed solution : Implement disk striping with parity.
Which results does the proposed solution produce?
a. The proposed solution produces the required result and the optional results.
Required result : A ) Disk operations must be able to continue if two members fail.
Optional results : B ) Read operations should be faster than disk mirroring. C ) The system and CPU overhead should be less than disk mirroring.
Proposed solution : 1 ) Implement disk striping with parity.
Map 1 to B : A stripe set with parity, along with a stripe set without parity, provides the fastest read operation out of all NT's disk sets. One optional result is satisified.
Map 1 to C : In a stripe set with parity, the CPU is required to calculate the parity bits before writing them to disk. Therefore, the write operations of a stripe set with parity is the slowest out of all NT's disk sets. Optional result C is not satisified. Result of step 1 : Only one optional result is satisified. You can eliminate answer A.
Map 1 to A : In a stripe set with parity, if one member fails than disk operations can continue. However, if two or more members fail, then disk operations will stop until the failed members are replaced and data is restord from tape backup.
Count : The required result is not satisified. When the required result is not satisified, then there can only be one possible answer.
Question 4. True or False. A volume set does not provide fault tolerance, but it does provide an increase in disk performance.
a . True.
b. False.
A volume set is just a collection of free disk space. A volume set does not provide fault tolerance nor does it provide any increase in disk performance.
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