PDC20319 SATA RAID Controller User Manual
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Q: How does the PDC20319 SATA RAID Controller provide storage and/or
data protection with their arrays?
A: The Controller implements three different types of RAID levels as follows:
RAID 0 (Stripe)
For capacity – The PDC20319 SATA RAID Controller array will be as big as the
smallest HDD in the array times however many HDDs are in the array. Any
larger HDDs will simply be truncated. The truncated space on the bigger HDDs
will then be unusable.
For sustained data transfers – Using the PDC20319 SATA RAID Controller, a
RAID 0 array consisting of two HDDs will transfer at about twice the speed of the
slowest HDD in the array. A RAID 0 array consisting of four HDDs will transfer at
about three times the speed of the slowest HDD in the array.
RAID 1 (Mirror)
For capacity – The PDC20319 SATA RAID Controller array will be as big as the
smallest HDD in the array. The larger HDD will simply be truncated. The
truncated space on the bigger HDD will then be unusable.
For sustained data transfers – The PDC20319 SATA RAID Controller array will
write data at the rate of the slowest HDD in the array. The array will read data at
twice the rate of the slowest HDD in the array.
Drive Issues
Q: Can I add a drive to a PDC20319 SATA RAID Controller array via hot-swap
and dynamically adjust the array size/configuration?
A: No. The Controller does not support dynamically adjustable RAID
size/configurations.
Q: Do the HDDs on the PDC20319 SATA RAID Controller have to be the
same size?
A: The HDDs that you use with the Controller do not have to be the same size.
If the sizes differ, the Controller will truncate the bigger HDD so the drives match.
The resulting difference in HDD space is unusable, so avoid using HDDs of
significantly different capacities.
Q: I already have an array on an older Promise FastTrak controller. Can I
move that array to my new PDC20319 SATA RAID Controller?
A: Yes. A FastTrak controller and the PDC20319 SATA RAID Controller read
arrays the same way. The arrays can move from one controller to the other.
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