Which of the following RAID levels functions as a single virtual disk?
A.
RAID Level 7
B.
RAID Level 5
C.
RAID Level 10
D.
RAID Level 2
Explanation:
RAID level 2 would be our guess, but all of them can function as a single virtual disk, that is what
logical drives present.
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answer should be RAID Level 7.
“RAID Level 7 is a variation of RAID 5 wherein the array functions as a single virtual disk in the hardware. This is sometimes simulated by software running over a RAID level 5 hardware implementation, which enables the drive array to continue to operate if any disk or any path to any disk fails. It also provides parity protection.” Pg 91 Krutz: CISSP Prep Guide: Gold Edition.
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To make a even more confusing it is RAID 10………….:
Look at http://osr507doc.sco.com/en/OSAdminG/vdmC.vdtypes.html#vdmC.raid4. Here is an explanation of the concept of a single virtual disk.
Example striped mirrored disk (you have to see the above showns URL because it shows a picture that explains the concept of a single virutal disk).
In this example, Disk 1 is mirrored to Disk 2, Disk 3 is mirrored to Disk 4, and so on. The four mirrored virtual disks are then configured as a single striped disk. Disks 1, 3, 5, and 7 are striped together and disks 2, 4, 6, and 8 mirror them under a single virtual disk node. This configuration will protect disks from:
Failure of one of the host adapters.
Multiple disk failures on a single bus.
Multiple disk failures on either bus.
This configuration will not protect from simultaneous disk failures of Disk 1 and Disk 2 or Disk 3 and Disk 4, and so on. Striped-mirror configurations can result in performance improvements over standard mirror or standard striped configurations.
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