lvresize

lvresize [--alloc AllocationPolicy] [--noudevsync] [-i|--stripes Stripes [-I|--stripesize StripeSize]] {[-l|--extents [+|-]LogicalExtentsNumber[%{VG|LV|PVS|FREE|ORIGIN}] | [-L|--size [+|-]LogicalVolumeSize[bBsSkKmMgGtTpPeE]} [-f|--force] [-n|--nofsck] [-r|--resizefs] LogicalVolume{Name|Path} [PhysicalVolumePath[:PE[-PE]]...]

lvresize allows you to resize a logical volume. Be careful when reducing a logical volume's size, because data in the reduced part is lost!!! You should therefore ensure that any filesystem on the volume is shrunk first so that the extents that are to be removed are not in use. Resizing snapshot logical volumes (see lvcreate(8) for information about creating snapshots) is supported as well. But to change the number of copies in a mirrored logical volume use lvconvert(8).

See lvm(8) for common options.

-f, --force

Force resize without prompting even when it may cause data loss.

-n, --nofsck

Do not perform fsck before resizing filesystem when filesystem requires it. You may need to use --force to proceed with this option.

-r, --resizefs

Resize underlying filesystem together with the logical volume using fsadm(8).

-l, --extents [+|-]LogicalExtentsNumber[%{VG|LV|PVS|FREE|ORIGIN}]

Change or set the logical volume size in units of logical extents. With the + or - sign the value is added to or subtracted from the actual size of the logical volume and without it, the value is taken as an absolute one. The number can also be expressed as a percentage of the total space in the Volume Group with the suffix %VG, relative to the existing size of the Logical Volume with the suffix %LV, as a percentage of the remaining free space of the PhysicalVolumes on the command line with the suffix %PVS, as a percentage of the remaining free space in the Volume Group with the suffix %FREE, or (for a snapshot) as a percentage of the total space in the Origin Logical Volume with the suffix %ORIGIN. The resulting value is rounded downward for the substraction otherwise it is rounded upward.

-L, --size [+|-]LogicalVolumeSize[bBsSkKmMgGtTpPeE]

Change or set the logical volume size in units of megabytes. A size suffix of M for megabytes, G for gigabytes, T for terabytes, P for petabytes or E for exabytes is optional. With the + or - sign the value is added or subtracted from the actual size of the logical volume and rounded to the full extent size and without it, the value is taken as an absolute one.

-i, --stripes Stripes

Gives the number of stripes to use when extending a Logical Volume. Defaults to whatever the last segment of the Logical Volume uses. Not applicable to LVs using the original metadata LVM format, which must use a single value throughout.

-I, --stripesize StripeSize

Gives the number of kilobytes for the granularity of the stripes. Defaults to whatever the last segment of the Logical Volume uses. Not applicable to LVs using the original metadata LVM format, which must use a single value throughout.
StripeSize must be 2^n (n = 2 to 9).

--noudevsync

Disable udev synchronisation. The process will not wait for notification from udev. It will continue irrespective of any possible udev processing in the background. You should only use this if udev is not running or has rules that ignore the devices LVM2 creates.

Extend a logical volume vg1/lv1 by 16MB using physical extents /dev/sda:0-1 and /dev/sdb:0-1 for allocation of extents:

lvresize -L+16M vg1/lv1 /dev/sda:0-1 /dev/sdb:0-1

fsadm(8), lvm(8), lvconvert(8), lvcreate(8), lvreduce(8), lvchange(8)