1、檢視已有LV

[root@localhost ~]# lvscan
  ACTIVE            '/dev/centos/swap' [2.00 GiB] inherit
  ACTIVE            '/dev/centos/root' [17.47 GiB] inherit
  ACTIVE            '/dev/vg_1/lv_1' [6.00 GiB] inherit
[root@localhost ~]# 

2、檢視特定的LV詳細資訊

[root@localhost ~]# lvdisplay /dev/vg_1/lv_1
  --- Logical volume ---
  LV Path                
 
/dev/vg_1/lv_1
  LV Name                lv_1 
  VG Name                vg_1   #所屬卷組名稱
  LV UUID                nYuw9Y-Iu7L-9EZk-41fm-AuIk-Bus7-e7oADq
  LV Write Access        read/write
  LV Creation host, time localhost, 2020-07-21 00:05:56 +0800
  LV Status              available
  # open                 1
  LV Size                
 
6.00 GiB   #lv大小
  Current LE             1536
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     8192
  Block device           253:2
   
[root@localhost ~]# 

3、LV擴容

[root@localhost ~]# umount /dev/vg_1/lv_1   #解除安裝lv
[root@localhost 
 
~]# lvextend -L +5G /dev/vg_1/lv_1   #擴容，在原來的基礎上增加5G的大小
  Size of logical volume vg_1/lv_1 changed from 6.00 GiB (1536 extents) to 11.00 GiB (2816 extents).
  Logical volume lv_1 successfully resized
[root@localhost ~]# mount /dev/vg_1/lv_1 /mnt/lv_1/   #掛載lv
[root@localhost ~]# xfs_growfs /mnt/lv_1/   #重新整理，使擴容生效，這裡也可以使用xfs_info，效果一樣
meta-data=/dev/mapper/vg_1-lv_1  isize=256    agcount=4, agsize=393216 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=0        finobt=0
data     =                       bsize=4096   blocks=1572864, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=0
log      =internal               bsize=4096   blocks=2560, version=2
         =                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
data blocks changed from 1572864 to 2883584
[root@localhost ~]#

4、LV縮容

[root@localhost ~]# umount /dev/vg_1/lv_1   #解除安裝
[root@localhost ~]# lvresize -L -5G /dev/vg_1/lv_1   #在原來的基礎上減小5G的大小
  WARNING: Reducing active logical volume to 7.00 GiB
  THIS MAY DESTROY YOUR DATA (filesystem etc.)
Do you really want to reduce lv_1? [y/n]: y
  Size of logical volume vg_1/lv_1 changed from 12.00 GiB (3072 extents) to 7.00 GiB (1792 extents).
  Logical volume lv_1 successfully resized
[root@localhost ~]# mount /dev/vg_1/lv_1 /mnt/lv_1/   #掛載
[root@localhost ~]# xfs_growfs /mnt/lv_1/   #重新整理，使修改生效，這裡也可以使用xfs_info，效果一樣
meta-data=/dev/mapper/vg_1-lv_1  isize=256    agcount=8, agsize=393216 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=0        finobt=0
data     =                       bsize=4096   blocks=2883584, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=0
log      =internal               bsize=4096   blocks=2560, version=2
         =                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
data size 1835008 too small, old size is 2883584
[root@localhost ~]# 

5、刪除LV

[root@localhost ~]# umount /dev/vg_1/lv_1   #解除安裝
[root@localhost ~]# lvremove /dev/vg_1/lv_1   #刪除lv
Do you really want to remove active logical volume lv_1? [y/n]: y
  Logical volume "lv_1" successfully removed
[root@localhost ~]#