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Fault tolerance is achieved through data redundant operation, where if one drives fails, a mirrored copy of the data can be found on another drive. This can prevent data loss if the operating system fails or hangs. The individual disk drives in an array are called members. The configuration information of each member is recorded in the reserved sector that identifies the drive as a member. All disk members in a formed disk array are recognized as a single physical drive to the operating system. Hard disk drives can be combined together through a few different methods. The different methods are referred to as different RAID levels. Different RAID levels represent different performance levels, security levels and implementation costs. The RAID levels which the nVIDIA® MCP-04 chipset supports are RAID 0, RAID 1, RAID 0+RAID 1, JBOD and RAID 5; the RAID levels which the Promise PDC20779 chip supports are RAID 0 and RAID 1. RAID 0 (Striping) RAID 0 reads and writes sectors of data interleaved between multiple drives. If any disk member fails, it affects the entire array. The disk array data capacity is equal to the number of drive members times the capacity of the smallest member. RAID 0 does not support fault tolerance. RAID 1 (Mirroring) RAID 1 writes duplicate data onto a pair of drives and reads both sets of data in parallel. If one of the mirrored drives suffers a mechanical failure or does not respond, the remaining drive will continue to function. Due to redundancy, the drive capacity of the array is the capacity of the smallest drive. Under a RAID 1 setup, an extra drive called the spare drive can be attached. Such a drive will be activated to replace a failed drive that is part of a mirrored array. Due to the fault tolerance, if any RAID 1 drive fails, data access will not be affected as long as there are other working drives in the array. RAID 0+1 (Striping + Mirroring) RAID 0+1 combines the performance of data striping (RAID 0) and the fault tolerance of disk mirroring (RAID 1). Data is striped across multiple drives and duplicated on another set of drives. JBOD (Spanning) A spanning disk array is equal to the sum of the all drives when the drives used are having different capacities. Spanning stores data onto a drive until it is full, then proceeds to store files onto the next drive in the array. When any disk member fails, the failure affects the entire array. JBOD is not really a RAID and does not support fault tolerance. RAID 5 (Striping with Parity) RAID 5 provides good fault tolerance and allows for overlapped I/O operations. Under a RAID 5 setup, data and parity information are equally distributed to each disk member in the array. If any one of the drives fails, the remaining drive will continue to function. After replacing the failed drive, you can rebuild the data from the remaining data and parity. Only one drive can be safely crash without any data loss. Only for GA-8N-SLI Royal. P4 nForce4 SLI Series Motherboard -76 English Please follow the steps below to construct a complete RAID array: 1) Have ready your hard drives for RAID construction. Note: To achieve best performance, it is recommended that the hard drives used are of similar make and storage capacity. 2) Please attach the hard drive connectors to their appropriate location on the motherboard ie. IDE, SCSI, or SATA. 3) Enter the motherboard BIOS and locate RAID setup (Please refer to the section on Integrated Peripherals). 4) Enter RAID setup in the BIOS and select the RAID type (For instance, enter F10 to select NVIDIA RAID; Ctrl + S to select Silicon Image). 5) Complete driver installation. 6) Complete RAID utility installation. More information on steps 4 and 5 is provided. (For more detailed setup information, please visit "Support\ Motherboard\ Technology Guide section" on our website at http:\\to read or download the information you need.) Configuring the Nvidia RAID BIOS The NVRAID BIOS setup lets you choose the RAID array type and which hard drives you want to make part of the array. Entering the RAID BIOS Setup 1. After rebooting your computer, wait until you see the RAID software prompting you to press F10. The RAID prompt appears as part of the system POST and boot process prior to loading the OS. You have a few seconds to press F10 before the window disappears. MediaShield IDE ROM BIOS 5.16 Copyright (C) 2005 NVIDIA Corp. Detecting array ... Press F10 to enter RAID setup utility ... Press F10. The NVIDIA RAID Utility -Define a New Array window appears (as Figure below). MediaShield RAID Utility Feb 8 2005 - Define a New Array - RAID Mode: Mirroring Striping Block: Optimal Free Disks Loc Disk Model Name 2.0.M ST3120026AS 2.1.M ST3120026AS Array Disks Loc Disk Model Name [..........] Add [..........] Del [ESC] Quit [F6] Back [F7] Finish [TAB] Navigate [....................] Select [ENTER] Popup -77 - Appendix English Using the "Define a New Array" Window If necessary, press the tab key to move from fie...