User`s manual

Biostar T-Series TForce4 SLI
Us e r’s M anual
16
RAID 1:
Every read an d write is actu ally carried out in parallel across 2 disk drives in a RAID 1
array system. The mirrored (backup) copy of the data can reside on the same disk or on a
second redundant drive in the array. RAID 1 provides a hot-standby copy of data if the
active vo lume or drive is co rrupted or becomes unavailable because of a hardware failure.
RAID techniques can be applied for high-availability solutions, or as a form of automatic
backup that eliminates tedious manual backups to more expensiv e and less reliab le media.
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 .
Bloc k 1
Block 2
Block 3
Block 1
Block 2
Block 3
RAID 0+1:
RAID 0 drives can be mirrored using RAID 1 techniques. Resulting in a RAID 0+1
solution for improved performance plus resiliency.
Features and Benefits
- Drives: Minimum 4, and maximum is 6 or 8, depending on the platform.
- Benefits: Optimizes for both fault tolerance and performance, allowing for
automatic redundancy. May be simultaneously used with other RAID levels
in an array, and allows for spare disks.
- Drawbacks: Requires twice the available disk space for data redundancy,
the same as RAID level 1.
- Fault Tolerance: Yes .
Block 2
Block 4
Block 6
Block 1
Blo ck 3
Blo ck 5
Block 2
Block 4
Block 6
Block 1
Blo ck 3
Blo ck 5