Volume management is a key component of storage systems that enables efficient allocation, management, and utilization of storage resources. Here are some volume management concepts:
- File- vs. block-level architecture: File-level architecture stores data in files, while block-level architecture stores data in blocks. Files are typically used for applications that need to access data in a structured way, such as databases and file servers. Block-level architecture is typically used for applications that need to access data in a more efficient way, such as storage arrays and virtualization hosts.
- Configuration layer: The configuration layer is the layer of the storage stack that is responsible for managing the physical storage devices and creating logical volumes. The configuration layer can be implemented in software or hardware.
- Logical volume management (LVM): LVM is a software-based configuration layer that allows you to create logical volumes from physical disks. LVM can be used to improve performance, scalability, and flexibility of your storage.
- Logical volume: A logical volume is a virtual disk that is created from physical disks. Logical volumes can be resized and moved, and they can be used to create filesystems.
- Volume group: A volume group is a collection of physical disks that are used to create logical volumes. Volume groups can be used to improve performance and reliability of your storage.
- Filesystem: A filesystem is a file system that is used to organize and store data on a logical volume. Filesystems provide a way for applications to access data on logical volumes.
- Mount point: A mount point is a directory on a host system that is used to mount a filesystem. When a filesystem is mounted, it becomes accessible to applications on the host system.