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NtServer企业级考题 |
| 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. 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.
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.
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.
RAID level 1 : Stripe set without parity does not provide any fault tolerance. You can eliminate A and D. RAID level 5 : Stripe set with parity provides fault tolerance. You need a mnium of three members and up to a maximum of 32. Volume set : Provides no fault tolerance and no performance increase. A volume set is just a collection of free hard disk space combined into a logical drive.
In a stripe set with parity, you can have 3 - 32 members in the set. You must have a minimum of 3. If 1 member in a stripe set with parity fails ====> Disk operations will continue. To recreate the stripe set with parity, replace the failed member and regenerate the parity bits through the Disk Administrator. If 2 or more members in a stripe with parity fails ====> Disk operations will stop. To recreate the stripe set with parity, replace the failed members, recreate the stripe set with parity, and restore data from tape backup. Question : On member in your stripe set with parity fails. Under what circumtance will Windows NT automatically recreate the parity stripes? Answer : Never. You have to replace the failed memeber and manually recreate the parity stripes through the Disk Administrator.
A volume set does provide any fault tolerance. If one member fails, then disk operations will stop. Only disk mirroring ( its hybrid disk duplexing ) and disk striping with parity provide fault tolerance under Windows NT. Question 8. You have a Windows NT Server computer called BIGNT, which has three hard drives. Each hard drive has one, and only one, primary partition. The boot partition is on the first drive and the system partition is on the second drive. Using the existing configuration, what fault tolerance standard can you implement on your Windows NT server? a . Disk mirroring. The only possible choice is disk mirroring-- since disk mirroring is the only fault tolerance standard that can include the system or boot partition. Answer D : The system partition ( the partition that contains the boot up files ) can be on any physical hard disk, and not necessary the first physical hard drive. You just have to change the ARC pathname in the "boot.ini" file to point to the physical disk number where the system partition resides. Question 9. You have four hard drives on your Windows NT Server
computer. You would like to use the free disk space from all four
drives to create one logical drive. You would like to have the fastest
read operations, and you are not concerened about fault tolerance.
What is the best disk set to implement? A stripe set without parity provides the fastest read and write operations out of all NT's disk sets. In a stripe set without parity, information is read and written to all members simultenously. In a volume set, information is read and written to only ONE member at a time. If you want the best disk performance, and you are not concerend with fault tolerance, then a stripe set without parity is the way to go. Question 10. You've implemented disk striping without parity on
your Windows NT Server computer. There are five members in the set.
On a certain day, one member in the set fails. What must you do
to restore data? Disk striping without parity provides the fastest read and write operations. However, it does NOT provide any fault tolerance. If one member in a stripe set without parity fails, then you must restore data from tape backup. Question : True or False. You want to change the size of the stripe set without parity. You must re-create the stripe set without parity and restore all data from backup. Answer True. In a stripe set without or with parity, the parition of all members in the set must be the same size. If you want to change the size of the stripe set, then you must re-create the stripe set and restore data from tape backup. |
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