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John, a system administrator at a growing e-commerce company, is tasked with configuring a RAID 5 array to support the company's increasing data storage needs. He needs to set up the array using three hard drives, ensuring that the data is both protected and accessible in the event of a drive failure. While configuring the array, John needs to understand how the RAID 5 system handles data redundancy and how parity data is distributed across the drives. How is the parity data stored and distributed in RAID 5?
According to the CHFI v11 Digital Evidence and Storage Fundamentals, RAID (Redundant Array of Independent Disks) configurations are critical for investigators to understand because they directly impact data availability, fault tolerance, and evidence reconstruction during forensic analysis. RAID 5 is one of the most commonly deployed RAID levels in enterprise environments due to its balance between performance, storage efficiency, and redundancy.
In a RAID 5 configuration, data and parity information are striped across all disks in the array. This means that parity blocks are not stored on a single dedicated drive; instead, parity is rotated among all participating drives. This design eliminates the bottleneck associated with a single parity disk and improves read performance while still providing fault tolerance.
If one drive fails, RAID 5 uses the distributed parity information along with the remaining data blocks to reconstruct the missing data on-the-fly, ensuring continued access to information. From a forensic perspective, this distributed parity mechanism is significant because investigators must correctly identify the RAID structure to rebuild the array and recover digital evidence accurately.
CHFI v11 explicitly differentiates RAID 5 from RAID 3 and RAID 4, which use dedicated parity disks, and from RAID 1, which relies on mirroring. Therefore, the correct and CHFI-aligned answer is Parity data is distributed across all drives in the array, making Option B correct.
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