내용을 읽다가 도대체 이건 쓰라고 해놓은건지 쓰지말란건지 분간이 안되는 상황 -_-
SCSI 컨트롤러에 내장된 RAID 가 RAID L0 / L1만 지원하고 L5 이런건 지원하지도 않고
내장 RAID는 CPU를 사용하므로 cpu에 부하가 걸리면 IO가 떨어진다는 협박문구라니 -ㅁ-! 

결론 : 그냥 RAID 1(mirroring) 으로 쓰는것 정도 외에는 별로인듯?

1. Integrated RAID Overview 
The integrated RAID solution provides cost benefits for the server or workstation market where 
the extra performance, storage capacity, and/or redundancy of a RAID configuration are 
required. The two components of integrated RAID are: 
 
ƒ  Integrated Mirroring (IM) provides features of RAID 1 
ƒ  Integrated Striping (IS) provides features of RAID 0

By simplifying the IM and IS configuration options and by providing firmware support in its host 
adapters, integrated RAID can offer the integrated RAID solution at a lower cost than a full-blown RAID implementation. 

This document provides a reference to expedite the configuration of integrated RAID.  
Notes: 

- Integrated RAID offers advanced features including I/O performance with additional data 
security; however, there are several considerations of which to be aware.  
- Only one RAID configuration (logical drive) is allowed. 
- Integrated RAID may take an extended period of time to complete the initialization after 
the RAID setup. The amount of time required depends whether the initialization is 
completed within the BIOS-based utility or completed with the operating system-based 
utility. The amount of time required also depends on the complexity of the configuration 
and capability of the system being configured. 
- Unlike a hardware controller, integrated RAID consumes system resources such as CPU 
cycles and system memory to handle I/O requests; in a situation where the CPU is 
heavily loaded, the I/O performance may drop significantly. 

2. Integrated RAID Implementation Guidelines 
2.1 Integrated Mirroring
 
Integrated Mirroring (IM) provides data protection for the system volume. The purpose is to 
safeguard critical information, such as the operating system.  
IM can be set up with two hard disk drives to maintain high performance, as well as data 
availability and fault tolerance. If one disk drive fails, the hot swap drive mechanism allows the 
system to maintain operation while the failed disk drive can be replaced. In addition, the hot 
spare capability enables the system to automatically replace the defective drive with a standby 
disk. 
IM requires extra time synchronization in BIOS mode as compared to the synchronization time 
in operating system mode. In BIOS mode (<Ctrl>+<C>), 1 hour for each 5 gigabytes of hard 
drive capacity is typically required to complete initializing the mirror. For example, for two 100 
gigabyte drives configured in a RAID 1 mirroring, 18-20 hours should be allowed for the 
initialization to complete.  
The IM firmware uses queue tagged I/Os to allow SCSI I/Os to continue on the IM volume while 
the volume is re-synchronized in the background. The host driver may optionally suspend the 
resynchronization operation while performing domain validation or while configuring Ultra320 
SCSI expanders.  
 
2.2 Integrated Striping 
Integrated Striping (IS) is available for applications that require faster I/O performance and 
higher storage capacity for non critical data. With this option there is no drive failover. Failure of 
a drive results in a loss of all data on the drives holding the data stripe. By reading and writing 
data concurrently across several disks, IS offers excellent performance as compared to a single 
physical disk. However, the risk of data loss increases because a single disk failure will cause 
the loss of the entire logical drive. 
The IS configuration is available only for new installations. Migration of data with existing disks 
is not supported.  

---- 2011.07.27 추가

아무튼, 일반 하드에서 RAID 0 로 변경은 지원하지 않으며
RAID 1 로 변경은 무지 오래 걸린다고 한다.


[링크 : ftp://download.intel.com/support/motherboards/server/sb/raid_im_is_guide_13.pdf]

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