Ubuntu what is lvm

Warning : Make sure that you double-check that the devices you intend to use with LVM do not have any important data already written to them. Using these devices within LVM will overwrite the current contents. If you already have important data on your server, make backups before proceeding.

To mark the storage devices as LVM physical volumes, use pvcreate. You can pass in multiple devices at once:. To create a new volume group from LVM physical volumes, use the vgcreate command. You will have to provide a volume group name, followed by at least one LVM physical volume:. This example will create your volume group with a single initial physical volume. Usually you will only need a single volume group per server. All LVM-managed storage can be added to that pool and then logical volumes can be allocated from that.

One reason you may wish to have more than one volume group is if you feel you need to use different extent sizes for different volumes. Usually you will not have to set the extent size the default size of 4M is adequate for most uses , but if you need to, you can do so upon volume group creation by passing the -s option:.

To expand a volume group by adding additional physical volumes, use the vgextend command. This command takes a volume group followed by the physical volumes to add. The physical volume will be added to the volume group, expanding the available capacity of the storage pool.

To a logical volume from a volume group storage pool, use the lvcreate command. Specify the size of the logical volume with the -L option, specify a name with the -n option, and pass in the volume group to allocate the space from. Provided that the volume group has enough free space to accommodate the volume capacity, the new logical volume will be created.

If you wish to create a volume using the remaining free space within a volume group, use the vgcreate command with the -n option to name and pass in the volume group as before. Logical volumes can be created with some advanced options as well. Some options that you may wish to consider are:. To create a striped volume, you must specify at least two stripes. This topology and stripe count requires a minimum of two physical volumes with available capacity:.

To create a mirrored volume, use the raid1 type. If you want more than two sets of data, use the -m option. This example uses -m 2 to create a total of three sets of data LVM counts this as one original data set with two mirrors. You will need at least three physical volumes for this to succeed:. To create a snapshot of a volume, you must provide the original logical volume to snapshot instead of the volume group.

Snapshots do not take up much space initially, but grow in size as changes are made to the logical volume it is tracking. The size used during this procedure is the maximum size that the snapshot can be snapshots that grow past this size are broken and cannot be used; snapshots approaching their capacity can be extended however :. Note : To revert a logical volume to the point-in-time of a snapshot, use the lvconvert --merge command:.

As you can see, there are a number of options that can dramatically alter the way that your logical volumes function. One of the main advantages of LVM is the flexibility it provides in provisioning logical volumes.

You can easily adjust the number or size of volumes on the fly without stopping the system. To grow the size of an existing logical volume, use the lvresize command. Use the -L flag to specify a new size. In that case, LVM will increase the size of the logical volume by the amount specified. Learn how your comment data is processed. May 28, Abu Sayeed Ubuntu Server. System Requirements for Ubuntu Server Go to Ubuntu official site [ubuntu. Now click on Option 2 — Manual server installation button and then click on Download Ubuntu Server Download will start and withing few minutes depending on download speed download will be finished.

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Ask Question. Asked 11 years, 2 months ago. Active 4 years, 10 months ago. Viewed k times. In terms of a web server installation, what benefits does it provide? Would you recommend using it? Improve this question. Matthew Blackford. Matthew Blackford Matthew Blackford 2, 2 2 gold badges 16 16 silver badges 9 9 bronze badges.

Add a comment. Active Oldest Votes. Other nice features that LVM "Logical Volumes" provide are: If you have more than one hard-disk, Logical Volumes can extend over more than one disk: i.

Downsides Of course, all of this comes at a price: the initial setup of LVM is more complex than just partitioning a disk, and you will definitely need to understand the LVM terminology and model Logical Volumes, Physical Volumes, Volume Groups before you can start using it. Also, if you use LVM across hard drives, you may lose all your data when only one drive fails. Improve this answer. Michael Laszlo 2 2 bronze badges.

Riccardo Murri Riccardo Murri With LVM2 you can also set up writeable snapshots too! Basically, LVM takes complicated things and makes them possible, but takes already possible things and makes them more complicated.