Managing Virtual Storage

23 Oct Managing Virtual Storage

The virtual machine (VM) requires storage for its data as well as system and program files. To enhance the overall performance of the VM, an administrator can make use of virtual storage to display the same physical or network-based storage device in multiple types of storage. The VM can access it without needing to know the underlying hardware.

Managing virtual storage requires the careful balance of capacity, performance and cost. Administrators must decide if they want to use all solid-state drives or hard-drive disks. They must also decide on the type and how many storage controllers they should use and how to combine them in a hybrid configuration. IT managers can cut storage costs by using compression and deduplication.

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

The virtual storage model cuts down the hardware burden by dissociating operating systems from physical devices and also by providing a single point of administration. It also permits scaling, since it automatically adjusts the physical capacity to meet demand. Additionally, it permits administrators to carry out a variety of tasks in a non-disruptive way like moving data off over-utilized storage devices. This is done using the technique of data migration. Generally, the mapping granularity determines how fast meta-data will be updated, how much additional space is required during the migration and how quickly the prior location can be designated as free.

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