虛擬機 /dev/mapper/centos-root 動態擴容

[root@bogon ~]# df -h
Filesystem               Size  Used Avail Use% Mounted on
/dev/mapper/centos-root  6.2G  6.2G   51M 100% /
devtmpfs                 908M     0  908M   0% /dev
tmpfs                    920M     0  920M   0% /dev/shm
tmpfs                    920M  8.6M  911M   1% /run
tmpfs                    920M     0  920M   0% /sys/fs/cgroup
/dev/sda1               1014M  175M  840M  18% /boot
tmpfs                    184M     0  184M   0% /run/user/0

 

該LVM分區動態擴容分兩種狀況:node

1、擴容原有磁盤/dev/sda

首先在虛擬機控制檯擴容已有的sda後centos

 1 fdisk /dev/sda 對/dev/sda磁盤進行操做(新建分區及格式化)
 2 n
 3 p
 4 回車 默認分區號;
 5 回車 默認磁盤建立開始位置;
 6 回車 默認磁盤建立結束位置;
 7 t 設置分區類型
 8 8e LVM類型
 9 w 保存
10 重啓
11 ls /dev/sd* 會發現多出一個/dev/sda3
12 lvm 進入lvm管理
13 lvm>pvcreate /dev/sda3 建立邏輯卷
14 lvm>vgextend centos /dev/sda3  //將初始化過的分區加入到虛擬卷組 centos
15 lvm>vgdisplay -v
16 lvm>lvextend -L +100G /dev/mapper/centos-root
17 lvm>pvdisplay   //查看卷容量
18 lvm>quit   
19 使用命令xfs_growfs /dev/mapper/centos-root擴展容量
20 df -h 進行查看擴容以後的

 

2、新加磁盤進行擴容

在虛擬機控制檯新加磁盤後,並重啓虛擬機bash

[root@bogon ~]# ls /dev/sd* 會發現多出一個/dev/sdb
/dev/sda  /dev/sda1  /dev/sda2  /dev/sdb
[root@bogon ~]# vgs
  VG     #PV #LV #SN Attr   VSize  VFree
  centos   1   2   0 wz--n- <7.00g    0
[root@bogon ~]# pvcreate /dev/sdb
WARNING: ext4 signature detected on /dev/sdb at offset 1080. Wipe it? [y/n]: y
  Wiping ext4 signature on /dev/sdb.
  Physical volume "/dev/sdb" successfully created.
[root@bogon ~]# vgs
  VG     #PV #LV #SN Attr   VSize  VFree
  centos   1   2   0 wz--n- <7.00g    0
[root@bogon ~]# vgextend centos /dev/sdb
  Volume group "centos" successfully extended
[root@bogon ~]# vgs
  VG     #PV #LV #SN Attr   VSize  VFree
  centos   2   2   0 wz--n- 26.99g <20.00g
[root@bogon ~]# lvs
  LV   VG     Attr       LSize   Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  root centos -wi-ao----  <6.20g
  swap centos -wi-ao---- 820.00m
[root@bogon ~]# df -h
Filesystem               Size  Used Avail Use% Mounted on
/dev/mapper/centos-root  6.2G  6.2G   43M 100% /
devtmpfs                 908M     0  908M   0% /dev
tmpfs                    920M     0  920M   0% /dev/shm
tmpfs                    920M  8.6M  911M   1% /run
tmpfs                    920M     0  920M   0% /sys/fs/cgroup
/dev/sda1               1014M  175M  840M  18% /boot
tmpfs                    184M     0  184M   0% /run/user/0
[root@bogon ~]# lvextend -L +20G /dev/mapper/centos-root
  Insufficient free space: 5120 extents needed, but only 5119 available
[root@bogon ~]# lvextend -L +19G /dev/mapper/centos-root
  Size of logical volume centos/root changed from <6.20 GiB (1586 extents) to <16.20 GiB (4146 extents).
  Logical volume centos/root successfully resized.
[root@bogon ~]# xfs_growfs /dev/mapper/centos-root
meta-data=/dev/mapper/centos-root isize=512    agcount=4, agsize=406016 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=1        finobt=0 spinodes=0
data     =                       bsize=4096   blocks=1624064, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=1
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 1624064 to 4245504
[root@bogon ~]# df -h
完成。
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