扩展虚拟机磁盘分区

超、凢脫俗 2022-05-12 01:18 269阅读 0赞

本文是扩展虚拟机 根目录（/ ）磁盘空间。

操作系统是CentOS7

1、首先使用 fdisk  新建一个磁盘分区，然后重启虚拟机.

[root@s201 ~]$fdisk /dev/sda
    Welcome to fdisk (util-linux 2.23.2).
    
    Changes will remain in memory only, until you decide to write them.
    Be careful before using the write command.
    
    
    Command (m for help): n
    Partition type:
       p   primary (2 primary, 0 extended, 2 free)
       e   extended
    Select (default p): p
    Partition number (3,4, default 3): 3
    First sector (41943040-73400319, default 41943040): 
    Using default value 41943040
    Last sector, +sectors or +size{K,M,G} (41943040-73400319, default 73400319): 
    Using default value 73400319
    Partition 3 of type Linux and of size 15 GiB is set
    
    Command (m for help): t  
    Partition number (1-3, default 3): 3
    Hex code (type L to list all codes): 8e
    Changed type of partition 'Linux' to 'Linux LVM'
    
    Command (m for help): w
    The partition table has been altered!
    
    Calling ioctl() to re-read partition table.
    
    WARNING: Re-reading the partition table failed with error 16: Device or resource busy.
    The kernel still uses the old table. The new table will be used at
    the next reboot or after you run partprobe(8) or kpartx(8)
    Syncing disks.

[root@s201 ~]$ls /dev/sd*
    /dev/sda  /dev/sda1  /dev/sda2  /dev/sda3

2：创建pv

[root@s201 ~]$pvcreate /dev/sda3
      Physical volume "/dev/sda3" successfully created.
    You have new mail in /var/spool/mail/root

4：把pv加入vg中，相当于扩充vg的大小

先使用vgs查看vg组

[root@s201 ~]$vgs
      VG     #PV #LV #SN Attr   VSize   VFree 
      centos   1   2   0 wz--n- <19.51g 40.00m

5、扩展vg，使用vgextend命令

[root@s201 ~]$ vgextend centos /dev/sda3
      Volume group "centos" successfully extended

[root@s201 ~]$vgs
      VG     #PV #LV #SN Attr   VSize  VFree  
      centos   2   2   0 wz--n- 44.50g <25.04g

6、扩展lv

[root@s201 ~]$lvextend -L +25G /dev/mapper/centos-root
      Size of logical volume centos/root changed from <17.47 GiB (4472 extents) to <42.47 GiB (10872 extents).
      Logical volume centos/root successfully resized.

7： 命令使系统重新读取大小

[root@s201 ~]$xfs_growfs /dev/mapper/centos-root
    meta-data=/dev/mapper/centos-root isize=256    agcount=4, agsize=1144832 blks
             =                       sectsz=512   attr=2, projid32bit=1
             =                       crc=0        finobt=0 spinodes=0
    data     =                       bsize=4096   blocks=4579328, 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 4579328 to 11132928

8、df -h 重新查看

[root@s201 ~]$df -h
    Filesystem               Size  Used Avail Use% Mounted on
    /dev/mapper/centos-root   43G  8.0G   35G  19% /
    devtmpfs                 475M     0  475M   0% /dev
    tmpfs                    492M     0  492M   0% /dev/shm
    tmpfs                    492M  7.8M  484M   2% /run
    tmpfs                    492M     0  492M   0% /sys/fs/cgroup
    /dev/sda1                497M  177M  321M  36% /boot
    tmpfs                     99M     0   99M   0% /run/user/0