Configuring Your Server 4-39Virtual DiskVirtual disk is a logical drive defined in disk group. It is recognized as a physical drive by OS. Theallowable number of virtual disks is up to 16 per disk group, or up to 64 per controller.The figure below shows a sample configuration in which the Onboard RAID Controller (LSIEmbedded MegaRAID) or Optional RAID Controller is connected with three hard disk drives,creating one Disk Group. Two RAID0 virtual disks (VD) are defined in the Disk Group.HDD 1(36 GB)HDD 2(36 GB)HDD 3(36 GB)RAID ControllerDG0 108 GBVD1-316 GBVD1-216 GBVD1-116 GBVD0-120GBVD0-220GBVD0-320GBVD0 (RAID0)60 GBVD1 (RAID0)48 GBParityThe parity means redundant data. A single set of redundant data is created from the data saved inmore than one hard disk drive.The created redundant data is used for data recovery when a hard disk drive is defected.Hot-SwapThe hot-swap enables a hard disk drive to be removed (or replaced) under system operation.Hot-SpareThe hot-spare is prepared as an auxiliary hard disk drive substituting for a defected hard disk driveincluded in a logical drive which is configured at a redundant RAID level. Detecting a hard diskdrive fault, the system disconnects the hard disk drive (or makes it offline) and starts rebuild usingthe hot-spare.
