Intel Integrated Mirroring / Integrated Striping RAID for Intel Server Boards SE7520BD2

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.

integrated RAID Configuration Guide.pdf

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