By Kowalski R.
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Additional info for Algorithm = Logic + Control
One reasonable system management policy might be to store easily replaceable data objects for which failure tolerance is not cost-justified on simple or spanned volumes (depending on the disks available and the amount of such data to be stored). This would allow expansion as business requirements dictated without significant management changes and without the cost overhead of failure tolerance. Striped Volumes One popular volume data mapping is the striping of data across several subdisks, each located on a different disk.
An embedded RAID controller is typically a single extended PCI module. Some vendors design server enclosures that are prewired for connecting a limited number of disks mounted in the server enclosure itself to an embedded RAID controller. The disadvantages of embedded RAID controllers are their limited scaling and failure tolerance and their requirement for specialty driver software. , SCSI) Host Computer Normal HBA Driver for Disks App App External RAID Controller File System Volume Manager Disk Driver Cache HBA SCSI or Fibre Channel Interface App Policy Processor Bus carries SCSI or Fibre Channel disk I/O commands.
Stripe unit size is constant for a striped volume. For simplicity, this example uses an unrealistically small stripe unit size. In practice, typical stripe unit sizes are between 50 and 200 blocks. The stripe unit size multiplied by the number of columns in a striped volume is the volume’s stripe size. 6 is 12 blocks (four blocks per subdisk times three subdisks). With this regular mapping, the volume manager can easily translate any volume block number to a physical block location. 6). The quotient of this division is the row number in which the block is located, with zero being the topmost row.