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CompTIA Security+ 3.4
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Does the Data Survive?

Disks fail in a RAID array. Does the data survive, or is it lost?

⚑ Complete this interactive to capture a CTF flag worth 5 points.

About this interactive

RAID 0 stripes with no fault tolerance: lose one disk and you lose the data. More disks add speed and capacity, and more risk. RAID 1 mirrors two disks. Lose one and the other has everything. RAID 5 stripes with distributed parity, needs at least three disks, and survives one failure. A second failure before the rebuild finishes loses the data. RAID 6 stores two parity bits per stripe, needs at least four disks, and survives two failures. RAID 10 (RAID 1+0) mirrors disks in pairs and stripes across the pairs. It survives one disk per pair, but both disks of one pair loses the data. RAID 0+1 stripes two sets of disks and mirrors one set to the other. It can lose several disks in one set, but not the same disk on both sides.

What you'll learn

Aligned to

CompTIA Security+
3.4 Explain the importance of resilience and recovery in security architecture.

Key terms

RAID 0
A RAID configuration that stripes data across two or more drives to improve read and write performance, but provides no fault tolerance — losing any one drive loses all data.
RAID 1
A RAID configuration that mirrors identical data simultaneously across two drives, providing full redundancy so that the array continues operating if either drive fails.
RAID 5
A RAID configuration that stripes data and distributed parity across three or more drives, providing read performance gains and the ability to survive the failure of any single drive.
RAID 6
A RAID configuration that stripes data across four or more drives with two independent sets of parity, allowing the array to survive the simultaneous failure of any two drives.
RAID 10
A nested RAID configuration (RAID 1+0) that applies mirroring at the drive level first, then striping across mirrored pairs, providing both redundancy and performance.
RAID 01
A nested RAID configuration (RAID 0+1) that applies striping at the drive level first, then mirrors the stripe sets, providing redundancy with different fault tolerance characteristics than RAID 10.
Fault Tolerance
A design property that allows a system to continue operating correctly even when one or more of its components fail, achieved through techniques such as redundancy and failover.

Topics

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