LVM, LogicalVolumeManger, is a logical volume management function provided by the Linux kernel. It is composed of kernel drivers and application layer tools. It creates a logical layer based on the hard disk partitions, which can be very flexible and very convenient to manage storage devices. . LVM uses the device-mapper function of the Linux kernel to virtualize the storage system (system partitions are independent of the underlying hardware). Through LVM, the storage space can be abstracted and virtual partitions can be established on it. Partitions can be expanded and reduced more easily. When adding or deleting partitions, there is no need to worry about not having enough contiguous space on a certain hard disk to avoid losing space for the one being used. disk

1. Introduction to LinuxLVM LinuxLogicalVolumeManager (LVM) is a tool for managing disks and storage space. It provides flexible storage management through volume groups and logical volumes. The core concepts of LVM include physical volumes, volume groups and logical volumes. Physical volume (PhysicalVolume, PV): A physical volume is a physical hard disk or partition, which is used by LVM to store data. LVM combines one or more physical volumes into volume groups. Volume Group (VG): A volume group is a logical storage unit composed of one or more physical volumes. Logical volumes are created on volume groups, and they can dynamically allocate and reclaim storage space. A system can contain multiple volume groups. logical volume (

Linux uses lvm. LVM refers to logical volume management, which is a mechanism for managing disk partitions in the Linux environment. LVM is a logical layer built on the hard disk and partitions to improve the flexibility of disk partition management. The biggest feature of LVM is that it can dynamically manage disks. Because the size of the logical volume can be dynamically adjusted without losing existing data; if a new hard disk is added, it will not change the existing upper logical volume. As a dynamic disk management mechanism, logical volume technology greatly improves the flexibility of disk management.

The lvm partition of Linux refers to "logical volume management". The full English name of lvm is "Logical Volume Manager", which is a mechanism for managing disk partitions in the Linux environment; LVM is a logic built on the hard disk and partitions. layer to improve the flexibility of disk partition management.

Linux uses lvm. LVM refers to logical volume management, which is a mechanism for managing disk partitions in the Linux environment. LVM is a logical layer built on the hard disk and partitions to improve the flexibility of disk partition management. The biggest feature of LVM is that it can dynamically manage disks. Because the size of the logical volume can be dynamically adjusted without losing existing data; if a new hard disk is added, it will not change the existing upper logical volume. As a dynamic disk management mechanism, logical volume technology greatly improves the flexibility of disk management. Introduction to LVM LVM is the abbreviation of Logical Volume Manager (LogicalVolumeManager). It is a method for managing disk partitions in the Linux environment.

LVM is the abbreviation of LogicalVolumeManager (Logical Volume Management), which is a mechanism for managing disk partitions in the Linux environment. LVM virtualizes one or more disk partitions (PV) into a volume group (VG), which is equivalent to a large hard disk, on which we can divide some logical volumes (LV). When the space in the volume group is insufficient, new disk partitions can be added. We can also allocate some space from the remaining space of the volume group for use by logical volumes that do not have enough space. The LVM model is as shown below: There is no need to restart to refresh the new hard disk file. First, use the cat command cat/proc/scsi/scsi to browse the Id:??What is the largest one? Then echo "scsiadd-

LVM (LogicalVolumeManagement) is a flexible storage management tool in Linux, which is easier to scale and manage than traditional partitions. It allows multiple physical disks to be combined into a volume group and create dynamically resized logical volumes from it, suitable for variable storage needs. For example, when a directory is insufficient, its capacity can be expanded directly from the volume group without repartitioning or restarting the system. In addition, LVM supports snapshot functionality, which can create instant copies of logical volumes for backup without interrupting service operation. Snapshots are thinly configured to take up extra space only when data changes, making them suitable for frequently updated databases or file systems. Finally, LVM also supports online resizing logical volume sizes, in conjunction with ext4 or

To adjust the LVM logical volume size, you must first confirm the file system type and support status before operation. ext4 supports online expansion and shrinkage (need to be unmounted or read-only mounted), xfs only supports online expansion; if there is no remaining space for the volume group during expansion, you need to add a physical volume and expand the volume group first, then use lvextend to expand the logical volume and adjust the file system; shrink the logical volume, you must unmount the file system, check and shrink the file system, and then shrink the logical volume, and finally remount it. The order cannot be reversed, otherwise data corruption may be caused.