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EVGA Z370 Classified K (134-KS-E379)
The Good-
RAID1 allows you to suffer a catastrophic failure of 1 drive with no ill effects to
the data being stored.
Because data is stored on 2 drives at once, read speeds typically increase a little,
but not to the speed of RAID5 and, certainly, not to the speed of RAID 0.
The Bad-
RAID1 is not a storage capacity-friendly array, because the capacity will be
limited to 1 drive.
o Due to the capacity available on modern drive solutions, this issue may
not be as significant as it once was.
Write speed will be a bit lower than a single drive.
In the charts below, you can see the effect of fault tolerance when using a mirror array:
because all data has a direct 1-to-1 duplicate on the mirrored drive, you can suffer a
catastrophic failure of a drive and still retain your data.
For a RAID1 array to lose its data, both drives must fail.
RAID 1 (2 Drive)
P-DRIVE1
P-DRIVE2
DATA-A
DATA-A
L-Drive = DATA-A
P-DRIVE1
P-DRIVE2
DATA-A
DATA-A
L-Drive = DATA-A
RAID5
: RAID5 is a stripe with Fault Tolerance, which attempts to bridge the gap
between speed and redundancy. This level will always reserve a capacity equivalent to
one drive for fault tolerance, regardless of the overall capacity. This means that if you
use four 1TB drives to create your RAID5, you will only have the capacity of three 1TB
L-DRIVE = ≃ 1TB
P-DRIVE1
P-DRIVE2
DATA-A
DATA-A
L-Drive = DATA-A
P-DRIVE1
P-DRIVE2
DATA-A
DATA-A
L-Drive = DATA-A
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