Examine this MDAM output: 
Which two aspects can be determined from this output?
A.
A RAID device failed and has been replaced with the hot spare.
B.
A new RAID device was just added to replace a failed one.
C.
Read and write performance is currently not optimal on this RAID set.
D.
Only write performance is currently not optimal on this raid set.
E.
An extra device was added to this RAID set to increase its size.
Explanation:
A B
A,C
B is wrong because the device was not just added. The server had a spare device.
I would go with A,C.
A = obvious
not B, spare HD was already in config
config = RAID5 —> will suffer performance during rebuild —> C
So correct answers are A,C
I don’t know that READ performance is impacted during rebuild. I choose A, D
Why not B? it doesn’t says there is a faulty disk…