10-4 Internal Cabling DiagramsConnection of Disk Array Controller N8103-91 (SAS)If SAS hard disk drives are installed, the disk array controller (SAS) can be connected to the server.The internal hard disk drives can be subject to the disk array configuration. The supported RAIDconfiguration includes RAID0 (striping), RAID1 (mirroring), and RAID5 (striping + parity). Harddisk drives having a different interface cannot be installed together. In addition, the disk arraycontroller cannot be connected to disk expansion unit. RAID0 (striping)Stores data on two hard disk drives by dividing it (striping). Both hard disk drives can beaccessed at the same time. This improves disk access performance compared with using asingle hard disk.IMPORTANT: RAID0 does not have data redundancy. When a hard disk drivefailure occurs, data cannot be restored. Logical capacity of the array becomes a multiple of the connectedhard disk drive. RAID1 (mirroring)Stores the data being saved to one hard disk dive to another hard disk drive. This methodis called "mirroring." When storing data onto one hard disk drive, the same data issimultaneously stored onto another hard disk drive. When a hard disk drive becomesfaulty, the one with the same data can be used. This provides operation without the systemgoing down.IMPORTANT: RAID1 reads or writes data to/from the two hard disk drives at thesame time. The disk access performance is lower than the singledisk. Logical capacity of the array is equal to one hard disk driveconnected.
