Motherboard Manual
38
4.5 RAID
Functions
RAID Definitions
RAID 0:
In a RAID 0 system data are split up in blocks that get
written across all the drives in the array. By using multiple
disks (at least 2) at the same time, this offers superior I/O
performance. This performance can be enhanced further
by using multiple controllers, ideally one controller per
disk.
Features and Benefits
Drives:
Minimum 2, and maximum is up to 6 or 8. Depending on the platform.
Uses:
Intended for non-critical data requiring high data throughput, or any
environment that does not require fault tolerance.
Benefits:
provides increased data throughput, especially for large files. No capacity
loss penalty for parity.
Drawbacks:
Does not deliver any fault tolerance. If any drive in the array fails, all data
is lost.
Fault Tolerance:
No.
Total Capacity:
(Minimal. HDD Capacity) x (Connected HDDs Amount)
RAID 1:
Data are stored twice by writing them to both the data
disk (or set of data disks) and a mirror disk (or set of
disks). If a disk fails, the controller uses either the data
drive or the mirror drive for data recovery and continues
operation. You need at least 2 disks for a RAID 1 array.
Features and Benefits
Drives:
Minimum 2, and maximum is 2.
Uses:
RAID 1 is ideal for small databases or any other application that requires fault
tolerance and minimal capacity.
Benefits:
Provides 100% data redundancy. Should one drive fail, the controller
switches to the other drive.
Drawbacks:
Requires 2 drives for the storage space of one drive. Performance is
impaired during drive rebuilds.
Fault Tolerance:
Yes.
