It’s possible to reduce the size of a logical volume without any data loss occurring.
The first step is to check the existing size of the logical volume:
[root@slave ~]# lvdisplay /dev/myvg/mylv
— Logical volume —
LV Path /dev/myvg/mylv
LV Name mylv
VG Name myvg
LV UUID K31i4c-mJmI-mNhJ-CvkB-c38D-7wCd-I2erTM
LV Write Access read/write
LV Creation host, time slave, 2014-10-13 20:01:22 -0400
LV Status available
# open 1
LV Size 4.00 GiB
Current LE 1024
Segments 2
Allocation inherit
Read ahead sectors auto
– currently set to 8192
Block device 253:2
The current size is 4 GB, although we would like to change the size to 2 GB.
As a cautious measure, run fsck on the logical volume to ensure that the file system is in a consistent state.
[root@slave ~]# fsck /dev/myvg/mylv
We will now resize the file system to 2 GB.
[root@slave ~]# resize2fs /dev/myvg/mylv 2G
The final step is to reduce the logical volume using lvreduce.
[root@slave ~]# lvreduce /dev/myvg/mylv -L 2G
WARNING: Reducing active and open logical volume to 2.00 GiB
THIS MAY DESTROY YOUR DATA (filesystem etc.)
Do you really want to reduce mylv? [y/n]: y
Reducing logical volume mylv to 2.00 GiB
Logical volume mylv successfully resized
Verify the new logical volume size using lvdisplay.
[root@slave ~]# lvdisplay /dev/myvg/mylv
— Logical volume —
LV Path /dev/myvg/mylv
LV Name mylv
VG Name myvg
LV UUID K31i4c-mJmI-mNhJ-CvkB-c38D-7wCd-I2erTM
LV Write Access read/write
LV Creation host, time slave, 2014-10-13 20:01:22 -0400
LV Status available
# open 1
LV Size 2.00 GiB
Current LE 512
Segments 1
Allocation inherit
Read ahead sectors auto
– currently set to 8192
Block device 253:2
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