10-4 Internal Cabling DiagramsConnection of Disk Array Controller (SATA)If serial ATA (SATA) disks are installed, the disk array controller (SATA) can be connected to theserver. The disk array controller (SATA) is an optional PCI RAID board provided to improve thedata reliability. It supports RAID5 as well as the RAID levels supported by the disk mirroringcontroller (RAID0 and RAID1). RAID0 (striping)RAID0 provides block "striping" across multiple drives, yielding higher performance thanis possible with individual drives. This level does not provide any redundancy.IMPORTANT: If either of the two hard disks configuring the array is defected, thedata cannot be recovered. The logical capacity of the array is an integer multiple of thecapacity of a connected hard disk. RAID1 (mirroring)The hard disk drives are paired and mirrored. All data is 100 percent duplicated on a driveof equivalent size.IMPORTANT: Because data is read to or written from two hard disks concurrently,the disk access performance is lower than that of the configurationusing only a single disk. The logical capacity of the array is the same as the capacity of asingle connected hard disk. RAID5 (striping + parity)Data is "striped" across three physical disk drives. For data redundancy, drives areencoded with rotated XOR redundancy.IMPORTANT: Because data is read from or written to three hard disks concurrently,the disk access performance is lower than that of the configurationusing only a single disk. Because the parity data is saved, the logical capacity is a little lowerthan the total capacity of the three hard disks.
