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EVGA Z490 FTW (122-CL-E497)
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
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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