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yes, D
RAID 5 and 6 use algorithms for a rebuild. RAID 5 use XOR this is fast because 1 math action for 1 block rebuild, RAID 6 use XOR and algorithm Reed Solomon is slowly because 2 math actions for rebuild 1 block data. The RAID 1 has a mirror disk then rebuild is only copy back.
All RAID levels have to "reconstruct" once the failed drive is replaced to re-establish resiliency. A RAID 10 does not have to calculate data using any parity....it simply copies the data to a mirror.
it couldn't be RAID6:
Notes
RAID 6 distributes the parity across all the disks. The write penalty (explained later in this module) in RAID 6 is more than that in RAID 5; therefore, RAID 5 writes perform better than RAID 6.
The rebuild operation in RAID 6 may take longer than that in RAID 5 due to the presence of two parity sets.
Advantages of RAID 10
If something goes wrong with one of the disks in a RAID 10 configuration, the rebuild time is very fast since all that is needed is copying all the data from the surviving mirror to a new drive. Should be D
Page 227 of the exam guide says: The rebuild operation in RAID 6 may take longer than that in RAID 5 due to the presence of two parity sets. So could be RAID 5, but probably 10.
Probably not D because with RAID10 there is no need to reconstruct data - data is in complete, we only loose redundant data. With RAID5/6 there is no redundant data and lost data has to be re-calculated from the parity info.
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