LVM operation

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Last login: Wed Jun 28 19:26:00 2022 from 123.189.233.143
[[email protected] ~]#
[[email protected] ~]# fdisk -l
The disk size is 214G, But only 100G
disk /dev/sda：214.7 GB, 214748364800 byte ,419430400 Sectors
Units = A sector of 1 * 512 = 512 bytes
Sector size ( Logic / Physics )：512 byte / 512 byte
I/O size ( Minimum / The best )：512 byte / 512 byte
Disk label type ：dos
Disk identifier ：0x000d0ed9

    equipment Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048     2099199     1048576   83  Linux
/dev/sda2         2099200   209715199   103808000   8e  Linux LVM
/dev/sda3       209715200   419430399   104857600   8e  Linux LVM

disk /dev/mapper/centos-root：53.7 GB, 53687091200 byte ,104857600 Sectors
Units = A sector of 1 * 512 = 512 bytes
Sector size ( Logic / Physics )：512 byte / 512 byte
I/O size ( Minimum / The best )：512 byte / 512 byte

disk /dev/mapper/centos-swap：2147 MB, 2147483648 byte ,4194304 Sectors
Units = A sector of 1 * 512 = 512 bytes
Sector size ( Logic / Physics )：512 byte / 512 byte
I/O size ( Minimum / The best )：512 byte / 512 byte

disk /dev/mapper/centos-home：50.5 GB, 50457477120 byte ,98549760 Sectors
Units = A sector of 1 * 512 = 512 bytes
Sector size ( Logic / Physics )：512 byte / 512 byte
I/O size ( Minimum / The best )：512 byte / 512 byte
Check disk capacity
[[email protected] ~]# df -h
file system                 Capacity   Already used   You can use Already used % Mount point
devtmpfs                 7.8G     0  7.8G    0% /dev
tmpfs                    7.8G  4.0K  7.8G    1% /dev/shm
tmpfs                    7.8G   50M  7.8G    1% /run
tmpfs                    7.8G     0  7.8G    0% /sys/fs/cgroup
/dev/mapper/centos-root   50G   50G  349M  100% /
/dev/sda1               1014M  245M  770M   25% /boot
/dev/mapper/centos-home   47G  2.4G   45G    6% /home
tmpfs                    1.6G     0  1.6G    0% /run/user/0

establish pv( Give the newly created partition /dev/sda3), And then put pv Join in vg in , It's equivalent to expanding vg Size

[[email protected] ~]# pvcreate /dev/sda3
WARNING: ext4 signature detected on /dev/sda3 at offset 1080. Wipe it? [y/n]: y
  Wiping ext4 signature on /dev/sda3.
  Physical volume "/dev/sda3" successfully created.
You are in /var/spool/mail/root New message in
[[email protected] ~]# vgs
  VG     #PV #LV #SN Attr   VSize   VFree
  centos   1   3   0 wz--n- <99.00g 4.00m

Expand vg, Use vgextend command

[[email protected] ~]# vgextend centos /dev/sda3
  Volume group "centos" successfully extended
You are in /var/spool/mail/root New message in
[[email protected] ~]# vgs
  VG     #PV #LV #SN Attr   VSize   VFree
  centos   2   3   0 wz--n- 198.99g 100.00g

see lv size

[[email protected] ~]# lvs
  LV   VG     Attr       LSize  Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  home centos -wi-ao---- 46.99g
  root centos -wi-ao---- 50.00g
  swap centos -wi-ao----  2.00g

Expand lv, Use lvextend command
[[email protected] ~]#lvextend -L +40G /dev/mapper/centos-root
  Size of logical volume centos/root changed from 50.00 GiB (12800 extents) to 90.00 GiB (23040 extents).
  Logical volume centos/root successfully resized.
You are in /var/spool/mail/root New message in

Expand lv, Use lvextend command

[[email protected] ~]# lvextend -L +20G /dev/mapper/centos-home
  Size of logical volume centos/home changed from 46.99 GiB (12030 extents) to 66.99 GiB (17150 extents).
  Logical volume centos/home successfully resized.
[[email protected] ~]# lvs
  LV   VG     Attr       LSize  Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  home centos -wi-ao---- 66.99g
  root centos -wi-ao---- 90.00g
  swap centos -wi-ao----  2.00g

Find out centos-root There is no change in space , Use command xfs_growfs Make the system read the size again

[[email protected] ~]# df -h
file system                 Capacity   Already used   You can use Already used % Mount point
devtmpfs                 7.8G     0  7.8G    0% /dev
tmpfs                    7.8G  4.0K  7.8G    1% /dev/shm
tmpfs                    7.8G   50M  7.8G    1% /run
tmpfs                    7.8G     0  7.8G    0% /sys/fs/cgroup
/dev/mapper/centos-root   50G   50G  349M  100% /
/dev/sda1               1014M  245M  770M   25% /boot
/dev/mapper/centos-home   47G  2.4G   45G    6% /home
tmpfs                    1.6G     0  1.6G    0% /run/user/0
You are in /var/spool/mail/root New message in
[[email protected] ~]#  xfs_growfs /dev/mapper/centos-root
meta-data=/dev/mapper/centos-root isize=512    agcount=4, agsize=3276800 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=1        finobt=0 spinodes=0
data     =                       bsize=4096   blocks=13107200, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=1
log      =internal               bsize=4096   blocks=6400, version=2
         =                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
data blocks changed from 13107200 to 23592960
[[email protected] ~]# df -h
file system                 Capacity   Already used   You can use Already used % Mount point
devtmpfs                 7.8G     0  7.8G    0% /dev
tmpfs                    7.8G  4.0K  7.8G    1% /dev/shm
tmpfs                    7.8G   50M  7.8G    1% /run
tmpfs                    7.8G     0  7.8G    0% /sys/fs/cgroup
/dev/mapper/centos-root   90G   50G   41G   56% /
/dev/sda1               1014M  245M  770M   25% /boot
/dev/mapper/centos-home   47G  2.4G   45G    6% /home
tmpfs                    1.6G     0  1.6G    0% /run/user/0
[[email protected] ~]#  xfs_growfs /dev/mapper/centos-home
meta-data=/dev/mapper/centos-home isize=512    agcount=4, agsize=3079680 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=1        finobt=0 spinodes=0
data     =                       bsize=4096   blocks=12318720, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=1
log      =internal               bsize=4096   blocks=6015, version=2
         =                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
data blocks changed from 12318720 to 17561600
You are in /var/spool/mail/root New message in
[[email protected] ~]# df -h
file system                 Capacity   Already used   You can use Already used % Mount point
devtmpfs                 7.8G     0  7.8G    0% /dev
tmpfs                    7.8G  4.0K  7.8G    1% /dev/shm
tmpfs                    7.8G   50M  7.8G    1% /run
tmpfs                    7.8G     0  7.8G    0% /sys/fs/cgroup
/dev/mapper/centos-root   90G   50G   41G   56% /
/dev/sda1               1014M  245M  770M   25% /boot
/dev/mapper/centos-home   67G  2.4G   65G    4% /home
tmpfs                    1.6G     0  1.6G    0% /run/user/0
[[email protected] ~]#