lvm基本操作

安装

$ yum install -y lvm2

创建

创建pv并查看

$ pvcreate /dev/sda3 
  Physical volume "/dev/sda3" successfully created.

$ pvdisplay /dev/sda3
  "/dev/sda3" is a new physical volume of "<206.38 GiB"
  --- NEW Physical volume ---
  PV Name               /dev/sda3
  VG Name               
  PV Size               <206.38 GiB
  Allocatable           NO
  PE Size               0   
  Total PE              0
  Free PE               0
  Allocated PE          0
  PV UUID               OKDd2t-4iMt-J2T3-hzN4-Z3YX-TXFJ-jMOMoh

提前创建好分区

创建vg并查看

$ vgcreate vg01 /dev/sda3
  Volume group "vg01" successfully created


$ vgdisplay vg01
  --- Volume group ---
  VG Name               vg01
  System ID             
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  1
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                0
  Open LV               0
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               <206.38 GiB
  PE Size               4.00 MiB
  Total PE              52832
  Alloc PE / Size       0 / 0   
  Free  PE / Size       52832 / <206.38 GiB
  VG UUID               zTQM1F-oEK0-NxbR-bNCP-je4K-cY2q-QsbnC1

创建lv并查看

$ lvcreate -L +16G -n app vg01
  Logical volume "app" created.


$ lvdisplay /dev/vg01/app
  --- Logical volume ---
  LV Path                /dev/vg01/app
  LV Name                app
  VG Name                vg01
  LV UUID                5QKnpz-ozqJ-C51c-oB6A-jJ4O-oDeq-yyAQTW
  LV Write Access        read/write
  LV Creation host, time kvm.ecloud.com, 2022-03-21 16:57:46 +0800
  LV Status              available
  $ open                 0
  LV Size                16.00 GiB
  Current LE             4096
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:2

挂载

$ mkfs.xfs -f /dev/vg01/app
meta-data=/dev/vg01/app          isize=512    agcount=4, agsize=1048576 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=1        finobt=0, sparse=0
data     =                       bsize=4096   blocks=4194304, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=1
log      =internal log           bsize=4096   blocks=2560, version=2
         =                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0

$ mkdir /app

$ cat << EOF | sudo tee -a /etc/fstab > /dev/null
/dev/vg01/app                            /app                    xfs     defaults        0 0
EOF

$ mount -a

扩容

确认挂载点的文件系统

$ df -Th

xfs文件系统

etx4文件系统

缩容

etx4文件系统