Managing Virtual Storage

Managing Virtual Storage

The virtual machine (VM) is a computer program requires storage to store its data. Virtual storage is a way to boost the performance of a VM by showing a single physical device or network-based storage as multiple types. Then the VM can access it without knowing about the underlying hardware.

The management of virtual storage requires a careful balance of performance, capacity and cost. Admins need to decide if they wish to use only solid-state drives, or hard-drive disks. They should also decide on the kind of storage controllers and how many they will implement. IT managers can lower storage costs by using compression and deduplication.

There are three kinds of storage: RAID groups, logical volumes (LV) and physical disks. Physical disks and groups of RAID divide the physical capacity into smaller units that applications or servers interpret as one storage device. A virtualization layer converts I/O requests made by the server to the right physical disk.

The virtual storage model cuts down the hardware cost by segregating operating systems from physical devices and also by providing a single point of administration. It also offers scalability through automatically adjusting the amount of physical capacity to meet the demands. It also allows administrators to perform a variety of tasks in a non-disruptive manner for example, shifting data from devices with high utilization. Data migration is a technique that allows this to be accomplished. The mapping granularity determines the speed of meta-data updates that can be made, the amount of much space will be needed during the process of migration and how fast an old location can become free.

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