Biostar TForce4U-775 User Manual page 14

Biostar T-Series
RAID 1:
Every read and write is actually 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 volume or drive is corrupted 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 expensive and less reliable 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.
­
Block 1
Block 2
Block 3
Block 1
Block 2
Block 3
12
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 1 Block 2
Block 3 Block 4
Block 5 Block 6
TForce4 U 775
Block 1 Block 2
Block 3 Block 4
Block 5 Block 6
User's Manual