Each volume group is made up of physical volumes. LVM is made up of three components: Physical Volume, Volume Group and Logical Volume. Using LVM you can create, grow and shrink partitions as per your needs. ![]() In that case, using the additional Abstraction layer of LVM may be unnecessary. LVM (Logical Volume Manager) is a software that allows you to manage multiple hard disk space by creating logical volumes. If you use the Btrfs file system, its Subvolume feature will also give you the benefit of having a flexible layout. There is no official support in most other OS (FreeBSD, Windows.).Īdditional steps in setting up the system, more complicated. Snapshots allow you to backup a frozen copy of the file system, while keeping service downtime to a minimum. Online/live migration of LV being used by services to different disks without having to restart services. File systems on them still need to be resized, but some support online resizing. Resize/create/delete logical and physical volumes online. It does not depend on the position of the LV within VG, there is no need to ensure surrounding available space. Resize logical volumes regardless of their order on disk. Have logical volumes stretched over several disks.Ĭreate small logical volumes and resize them "dynamically" as they get more filled. LVM gives you more flexibility than just using normal hard drive partitions: Then, when the partitions start to fill up, they can be expanded as necessary. You can think of LVM as dynamic partitions, meaning that you can create/resize/delete LVM partitions (theyre called Logical Volumes in LVM-speak). ![]() You can also allocate minimal amounts of space for each logical volume and leave some of the disk unallocated. One of the big advantages of LVM is that you can most easily reduce the size of one partition, and use it on other partitions for example, without data loss. You should read some more specified info here at The Linux Logical Volume ManagerĪlso there's some good information at A Beginner's Guide To LVM With LVM, "logical" partitions can span across physical hard drives and can be resized (unlike traditional ext3 "raw" partitions).Ī physical disk is divided into one or more physical volumes (Pvs), and logical volume groups (VGs) are created by combining PVs. ![]() Logical volume management is a widely-used technique for deploying logical rather than physical storage.
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