Choose the one fits your needs.
Advantages & characteristics
RAID Level 0 requires a minimum of 2 drives to implement
RAID 0 implements a striped disk array, the data is broken down into blocks and each block is written to a separate disk drive
I/O performance is greatly improved by spreading the I/O load across many channels and drives
Best performance is achieved when data is striped across multiple controllers with only one drive per controller
No parity calculation overhead is involved
Very simple design
Easy to implement
[
b]Disadvantages[/b]
Not a "True" RAID because it is NOT fault-tolerant
The failure of just one drive will result in all data in an array being lost
Should never be used in mission critical environments
Recommended Applications
Video Production and Editing
Image Editing
Pre-Press Applications
Any application requiring high bandwidth
Advantages & characteristics
Raid 1- RAID Level 1 requires a minimum of 2 drives to implement
One Write or two Reads possible per mirrored pair
Twice the Read transaction rate of single disks, same Write transaction rate as single disks
100% redundancy of data means no rebuild is necessary in case of a disk failure, just a copy to the replacement disk
b]Disadvantages[/b]
Highest disk overhead of all RAID types (100%) - inefficient
Typically the RAID function is done by system software, loading the CPU/Server and possibly degrading throughput at high activity levels. Hardware implementation is strongly recommended
May not support hot swap of failed disk when implemented in "software"
Recommended Applications
Accounting
Payroll
Financial
Any application requiring very high availability
Raid 5
Each entire data block is written on a data disk; parity for blocks in the same rank is generated on Writes, recorded in a distributed location and checked on Reads.
RAID Level 5 requires a minimum of 3 drives to implement
Advantages & characteristics
Highest Read data transaction rate
Medium Write data transaction rate
Low ratio of ECC (Parity) disks to data disks means high efficiency
Good aggregate transfer rate
b]Disadvantages[/b]
Disk failure has a medium impact on throughput
Most complex controller design
Difficult to rebuild in the event of a disk failure (as compared to RAID level 1)
individual block data transfer rate same as single disk
Recommended Applications
File and Application servers
Database servers
Web, E-mail, and News servers
Intranet servers
Most versatile RAID level
Raid 0 + 1
RAID Level 0+1 requires a minimum of 4 drives to implement
Advantages & characteristics
RAID 0+1 is implemented as a mirrored array whose segments are RAID 0 arrays
RAID 0+1 has the same fault tolerance as RAID level 5
RAID 0+1 has the same overhead for fault-tolerance as mirroring alone
High I/O rates are achieved thanks to multiple stripe segments
Excellent solution for sites that need high performance but are not concerned with achieving maximum reliability
Disadvantage
RAID 0+1 is NOT to be confused with RAID 10. A single drive failure will cause the whole array to become, in essence, a RAID Level 0 array
Very expensive / High overhead
All drives must move in parallel to proper track lowering sustained performance
Very limited scalability at a very high inherent cost
Recommended Applications
Imaging applications
General fileserver
Hope this help u out.
From the Hard Drive Expert