1LVREDUCE(8) System Manager's Manual LVREDUCE(8)
2
6 lvreduce — reduce the size of a logical volume
7
9 lvreduce [-A|--autobackup {y|n}] [--commandprofile ProfileName]
10 [-d|--debug] [-h|--help] [-t|--test] [-v|--verbose] [--version]
11 [-f|--force] [--noudevsync] {-l|--extents [-]LogicalExtentsNum‐
12 ber[%{VG|LV|FREE|ORIGIN}] | [-L|--size [-]LogicalVolumeSize[bBsSkKmMg‐
13 GtTpPeE]} [-n|--nofsck] [-r|--resizefs] LogicalVolume{Name|Path}
14
16 lvreduce allows you to reduce the size of a logical volume. Be careful
17 when reducing a logical volume's size, because data in the reduced part
18 is lost!!!
19 You should therefore ensure that any filesystem on the volume is
20 resized before running lvreduce so that the extents that are to be
21 removed are not in use.
22 Shrinking snapshot logical volumes (see lvcreate(8) for information to
23 create snapshots) is supported as well. But to change the number of
24 copies in a mirrored logical volume use lvconvert(8).
25 Sizes will be rounded if necessary - for example, the volume size must
26 be an exact number of extents and the size of a striped segment must be
27 a multiple of the number of stripes.
28
30 See lvm(8) for common options.
31 -f, --force
33 Force size reduction without prompting even when it may cause
34 data loss.
35 -l, --extents [-]LogicalExtentsNumber[%{VG|LV|FREE|ORIGIN}]
37 Reduce or set the logical volume size in units of logical
38 extents. With the - sign the value will be subtracted from the
39 logical volume's actual size and without it the value will be
40 taken as an absolute size. The total number of physical extents
41 freed will be greater than this logical value if, for example,
42 the volume is mirrored. The number can also be expressed as a
43 percentage of the total space in the Volume Group with the suf‐
44 fix %VG, relative to the existing size of the Logical Volume
45 with the suffix %LV, as a percentage of the remaining free space
46 in the Volume Group with the suffix %FREE, or (for a snapshot)
47 as a percentage of the total space in the Origin Logical Volume
48 with the suffix %ORIGIN. The resulting value for the subtrac‐
49 tion is rounded downward, for the absolute size it is rounded
50 upward. N.B. In a future release, when expressed as a percent‐
51 age with VG or FREE, the number will be treated as an approxi‐
52 mate total number of physical extents to be freed (including
53 extents used by any mirrors, for example). The code may cur‐
54 rently release more space than you might otherwise expect.
55 -L, --size [-]LogicalVolumeSize[bBsSkKmMgGtTpPeE]
57 Reduce or set the logical volume size in units of megabytes. A
58 size suffix of k for kilobyte, m for megabyte, g for gigabytes,
59 t for terabytes, p for petabytes or e for exabytes is optional.
60 With the - sign the value will be subtracted from the logical
61 volume's actual size and without it it will be taken as an abso‐
62 lute size.
63 -n, --nofsck
65 Do not perform fsck before resizing filesystem when filesystem
66 requires it. You may need to use --force to proceed with this
67 option.
68 --noudevsync
70 Disable udev synchronisation. The process will not wait for
71 notification from udev. It will continue irrespective of any
72 possible udev processing in the background. You should only use
73 this if udev is not running or has rules that ignore the devices
74 LVM2 creates.
75 -r, --resizefs
77 Resize underlying filesystem together with the logical volume
78 using fsadm(8).
79
81 Reduce the size of logical volume lvol1 in volume group vg00 by 3 logi‐
82 cal extents:
83 lvreduce -l -3 vg00/lvol1
85
87 fsadm(8), lvchange(8), lvconvert(8), lvcreate(8), lvextend(8), lvm(8),
88 lvresize(8), vgreduce(8)
89Sistina Software UKLVM TOOLS 2.02.143(2)-RHEL6 (2016-12-13) LVREDUCE(8)