Configuring Your Server 4-25Virtual 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 Internal RAID Controller (equivalent to N8103-116) is connected withthree HDDs, creating one Disk Group. Two RAID5 virtual disks (VD) are defined in the DiskGroup.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 (RAID5)40 GBVD1 (RAID5)32 GBParityThe parity means redundant data. A single set of redundant data is created from the data saved inmore than one HDD.The created redundant data is used for data recovery when a HDD is defected.Hot-SwapThe hot-swap enables a HDD to be removed (or replaced) under system operation.Hot-SpareThe hot-spare is prepared as an auxiliary HDD substituting for a defected HDD included in a logicaldrive which is configured at a redundant RAID level. Detecting a HDD fault, the systemdisconnects the HDD (or makes it offline) and starts rebuild using the hot-spare.
