010-151 · Question #101
Which statement about RAID is true?
The correct answer is A. RAID is a scheme used to logically combine several independent disks to form an array or group. RAID is a technology that logically combines multiple independent physical disks into a single array to deliver performance, redundancy, or both.
Question
Which statement about RAID is true?
Options
- ARAID is a scheme used to logically combine several independent disks to form an array or group
- BRAID provides data redundancy with either odd parity or even parity.
- CRAID drive group appears to the host computer as multiple physical storage units.
- DRAID parity information can be stored across multiple RAID levels.
- ERAID stores data in the array with data striping, encryption, and parity to organize the data among
How the community answered
(55 responses)- A73% (40)
- B4% (2)
- C2% (1)
- D13% (7)
- E9% (5)
Why each option
RAID is a technology that logically combines multiple independent physical disks into a single array to deliver performance, redundancy, or both.
RAID (Redundant Array of Independent Disks) is fundamentally defined as a method of logically grouping multiple independent physical disks into a single array that the host system treats as one logical storage unit. Depending on the RAID level chosen, this grouping enables striping for performance, mirroring for fault tolerance, or parity for data protection - sometimes combining multiple techniques simultaneously.
RAID parity is computed using XOR (exclusive OR) operations, which is even parity by nature; odd parity is not used in any standard RAID level implementation.
A RAID drive group presents itself to the host as a single logical storage unit, not as multiple physical units - abstracting multiple disks into one logical volume is the defining function of RAID.
Parity in RAID is distributed within a single configured RAID level (e.g., spread across member drives in RAID 5); parity information spanning across multiple different RAID levels simultaneously is not a defined or standard RAID behavior.
RAID organizes data through striping, mirroring, and parity - encryption is not a component of any standard RAID level and must be implemented separately through dedicated software or hardware encryption layers.
Concept tested: RAID fundamentals, data organization, and redundancy methods
Source: https://www.cisco.com/c/en/us/td/docs/unified_computing/ucs/c-series_storage_solutions/guide/b_Cisco_C_Series_Storage_Solutions.html
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