UBUNTU VOLUME MANAGER HOW TO
UBUNTU VOLUME MANAGER SOFTWARE

The default installation on many distributions separate storage this way, for example, the user’s data is held on the /home logical volume, and system logs are stored on the /var volume.

On top of a volume group, we can create logical volumes which in turn can hold filesystems. It will not be exactly the sum of the volumes, as some space is reserved for metadata. Note the VG size of close to 4 GB, the sum of the two physical volumes. VG UUID CmM07M-16Ys-PZx2-XGvo-N1j3-nINX-fnIFIA We can list our new volume group’s properties with vgdisplay. All we need is specifying the VG name, and the physical volumes which will be members of the volume group. We can create a volume group with vgcreate. We could create a volume “group” that has only one physical volume – which is the exact case of the default sda2 – but to demonstrate storage aggregation, we’ll use both our new physical volumes to create a volume group called “data” that has 4 GB of disk space available. PV UUID PWTs7Q-x3wD-RyXj-ertn-Sh2N-CiXb-ayDc1qĬreating volume group from physical volumes.Īfter re-creating the dropped sdc physical volume, we have all we need to create a volume group that can hold a logical volume.

'/dev/sdc' is a new physical volume of '2.00 GiB' PV UUID V2PUv4-O9eQ-jFvQ-UmQf-dmq3-caF9-xmxYGj '/dev/sdb' is a new physical volume of '2.00 GiB' PV UUID rfezEa-GlgW-jWUX-Zixs-Ydw0-EsZS-nk3JDH We can check if we did it right by listing our physical volumes. Physical volume '/dev/sdc' successfully created. Physical volume '/dev/sdb' successfully created. We’ll create a 2 GB physical volume on both sdb, and sdc. To create a physical volume, we’ll use pvcreate.

UBUNTU VOLUME MANAGER HOW TO

How to create and remove physical volumes How to create physical volume

They are recognized as /dev/sdb and /dev/sdc on our system, while /dev/sda holds the operating system, which we will not touch during the following steps. Even if we need to do this infrequently, it is easy to guess or find the right command, as this naming convention is consistent across all layers.įor this tutorial, we added to disks, 2 GB is size each to our lab machine. The commands that work on different layers all start with these abbreviations, for example, if we work with physical volumes, the command to create one will be pvcreate, the command to list existing physical volumes will be pvdisplay, and so on. The abbreviations of the layers are good reminders when we deal with LVM. So if we run out of space, we can scale without shutting down a system. One of the main features of LVM is that we can add another physical volume to a volume group on the fly, and we can also modify a logical volume’s size while the system is running. These can hold filesystems, in which we can store our data. On top of volume groups we can create the final layer, logical volumes (lv). At this layer we can aggregate all underlying physical volume’s space into a bigger storage unit. As the name suggests, it is simply the grouping of physical volumes. If we intend to use a disk as LVM physical volume only, we don’t need to create partition on it first. We can create a physical volume from a disk partition or a whole raw disk. With LVM, we have three layers that build on top of each other: physical volumes (pv), which are much like partitions, only marked for LVM usage. $ – requires given linux commands to be executed as a regular non-privileged user # – requires given linux commands to be executed with root privileges either directly as a root user or by use of sudo command Privileged access to your Linux system as root or via the sudo command.

UBUNTU VOLUME MANAGER SOFTWARE

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Ubuntu volume manager