FUNDAMENTALS OF COMPUTER

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TROUBLESHOOTING COMPUTER ISSUES

IDENTIFYING HARDWARE SOFTWARE NETWORK PROBLEMS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
If the computer you are working on has an onboard Redundant Array of Independent Disks (RAID) controller that appears in power-on self-test (POST) as functional, but your computer cannot boot from the array nor can it detect the array, what should you check to troubleshoot the problem?
A
Check the RAID configuration in the controller’s Basic Input/Output System (BIOS)
B
Check the controller’s cabling
C
Check the computer’s BIOS for correct memory settings
D
Check that your system has enough power to support the RAID array
Explanation: 

Detailed explanation-1: -RAID-1-provides fault tolerance by using disk mirroring (also called shadowing). Each byte of data on a disk is duplicated on another physical drive, providing 100% data redundancy.

Detailed explanation-2: -RAID works by placing data on multiple disks and allowing input/output (I/O) operations to overlap in a balanced way, improving performance. Because using multiple disks increases the mean time between failures, storing data redundantly also increases fault tolerance.

Detailed explanation-3: -A RAID 0 array of n drives provides data read and write transfer rates up to n times as high as the individual drive rates, but with no data redundancy.

Detailed explanation-4: -RAID-5. RAID-5 introduces the concept of parity to provide redundancy. Rather than write a complete duplicate of data to a second drive, it runs a fast algorithm across the same block on several disks and mathematically creates a new block based on them.

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