![]() The absence of metadata helps to make block storage very efficient because virtually all of the space on a block storage device can be used for storing data. The data stored in the blocks on either “side” of a particular block may have nothing to do with the data inside that block, and there are no hierarchies or “folders” that govern how block data is organized.īlocks also do not contain any metadata. The blocks are not stored in any particular order. The operating system uses the identifier to write and read each block of data. ![]() However, blocks can also be spread across a distributed replicated block device (DRBD), which is essentially a software-defined storage pool composed of individual hard disks.Įach block on a block device or DRBD has a unique identifier. Block Level Storage Definitionīlock storage is so-called because it involves storing data in “blocks.” Typically, the blocks all exist on a single hard drive, which the operating system treats as a block device. This article defines block storage, discusses common block storage use cases, and explains what makes block storage different from file-level storage. Another popular method - and one that is particularly useful when setting up virtual machine storage, network-attached storage and SAN storage - is block storage. However, file systems are only one way to organize data. The storage solutions used by typical end-users are file systems that are mapped to individual hard drives. When most people hear “data storage,” they think about conventional file-level storage.
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