VM虚拟机20G磁盘扩展到40G的Linux操作记录

怼烎@ 2023-06-21 10:13 13阅读 0赞

系统CentOS7  
原有磁盘20G  
先到VM客户端界面中扩展到40G，然后启动系统，进入系统后操作，操作记录如下：

Last login: Wed Dec 11 23:10:40 2019 from 192.168.1.47
    [root@cib-server1 ~]# df -h
    Filesystem             Size  Used Avail Use% Mounted on
    /dev/mapper/rhel-root   17G   17G  282M  99% /
    devtmpfs               1.9G     0  1.9G   0% /dev
    tmpfs                  1.9G     0  1.9G   0% /dev/shm
    tmpfs                  1.9G  9.0M  1.9G   1% /run
    tmpfs                  1.9G     0  1.9G   0% /sys/fs/cgroup
    /dev/sda1             1014M  179M  836M  18% /boot
    tmpfs                  379M     0  379M   0% /run/user/0
    [root@cib-server1 ~]# fdisk -l
    
    Disk /dev/sda: 42.9 GB, 42949672960 bytes, 83886080 sectors
    Units = sectors of 1 * 512 = 512 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    I/O size (minimum/optimal): 512 bytes / 512 bytes
    Disk label type: dos
    Disk identifier: 0x000ef4fd
    
       Device Boot      Start         End      Blocks   Id  System
    /dev/sda1   *        2048     2099199     1048576   83  Linux
    /dev/sda2         2099200    41943039    19921920   8e  Linux LVM
    
    Disk /dev/mapper/rhel-root: 18.2 GB, 18249416704 bytes, 35643392 sectors
    Units = sectors of 1 * 512 = 512 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    I/O size (minimum/optimal): 512 bytes / 512 bytes
    
    
    Disk /dev/mapper/rhel-swap: 2147 MB, 2147483648 bytes, 4194304 sectors
    Units = sectors of 1 * 512 = 512 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    I/O size (minimum/optimal): 512 bytes / 512 bytes
    
    [root@cib-server1 ~]# 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): p
    
    Disk /dev/sda: 42.9 GB, 42949672960 bytes, 83886080 sectors
    Units = sectors of 1 * 512 = 512 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    I/O size (minimum/optimal): 512 bytes / 512 bytes
    Disk label type: dos
    Disk identifier: 0x000ef4fd
    
       Device Boot      Start         End      Blocks   Id  System
    /dev/sda1   *        2048     2099199     1048576   83  Linux
    /dev/sda2         2099200    41943039    19921920   8e  Linux LVM
    
    Command (m for help): n
    Partition type:
       p   primary (2 primary, 0 extended, 2 free)
       e   extended
    Select (default p): 
    Using default response p
    Partition number (3,4, default 3): 
    First sector (41943040-83886079, default 41943040): 
    Using default value 41943040
    Last sector, +sectors or +size{K,M,G} (41943040-83886079, default 83886079): 
    Using default value 83886079
    Partition 3 of type Linux and of size 20 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): p
    
    Disk /dev/sda: 42.9 GB, 42949672960 bytes, 83886080 sectors
    Units = sectors of 1 * 512 = 512 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    I/O size (minimum/optimal): 512 bytes / 512 bytes
    Disk label type: dos
    Disk identifier: 0x000ef4fd
    
       Device Boot      Start         End      Blocks   Id  System
    /dev/sda1   *        2048     2099199     1048576   83  Linux
    /dev/sda2         2099200    41943039    19921920   8e  Linux LVM
    /dev/sda3        41943040    83886079    20971520   8e  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@cib-server1 ~]# ll /dev/sda*
    brw-rw---- 1 root disk 8, 0 Dec 12 01:45 /dev/sda
    brw-rw---- 1 root disk 8, 1 Dec 12 01:45 /dev/sda1
    brw-rw---- 1 root disk 8, 2 Dec 12 01:45 /dev/sda2
    [root@cib-server1 ~]# partx -a /dev/sda 
    partx: /dev/sda: error adding partitions 1-2
    [root@cib-server1 ~]# ll /dev/sda*
    brw-rw---- 1 root disk 8, 0 Dec 12 01:45 /dev/sda
    brw-rw---- 1 root disk 8, 1 Dec 12 01:45 /dev/sda1
    brw-rw---- 1 root disk 8, 2 Dec 12 01:45 /dev/sda2
    brw-rw---- 1 root disk 8, 3 Dec 12 01:45 /dev/sda3
    [root@cib-server1 ~]# pvcreate /dev/sda3
      Physical volume "/dev/sda3" successfully created.
    [root@cib-server1 ~]# pvs
      PV         VG   Fmt  Attr PSize   PFree 
      /dev/sda2  rhel lvm2 a--  <19.00g     0 
      /dev/sda3       lvm2 ---   20.00g 20.00g
    [root@cib-server1 ~]# vgs
      VG   #PV #LV #SN Attr   VSize   VFree
      rhel   1   2   0 wz--n- <19.00g    0 
    [root@cib-server1 ~]# vgextend rhel /dev/sda3
      Volume group "rhel" successfully extended
    [root@cib-server1 ~]# vgs
      VG   #PV #LV #SN Attr   VSize  VFree  
      rhel   2   2   0 wz--n- 38.99g <20.00g
    [root@cib-server1 ~]# lvs
      LV   VG   Attr       LSize   Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
      root rhel -wi-ao---- <17.00g                                                    
      swap rhel -wi-ao----   2.00g                                                    
    [root@cib-server1 ~]# lvextend -l +100%FREE /dev/sda
    /dev/sda2  /dev/sda3  
    [root@cib-server1 ~]# ll /dev/mapper/
    total 0
    crw------- 1 root root 10, 236 Dec 12 01:44 control
    lrwxrwxrwx 1 root root       7 Dec 12 01:44 rhel-root -> ../dm-0
    lrwxrwxrwx 1 root root       7 Dec 12 01:44 rhel-swap -> ../dm-1
    [root@cib-server1 ~]# lvextend -l +100%FREE /dev/mapper/rhel-root
      Size of logical volume rhel/root changed from <17.00 GiB (4351 extents) to 36.99 GiB (9470 extents).
      Logical volume rhel/root successfully resized.
    [root@cib-server1 ~]# lvs
      LV   VG   Attr       LSize  Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
      root rhel -wi-ao---- 36.99g                                                    
      swap rhel -wi-ao----  2.00g                                                    
    [root@cib-server1 ~]# xfs_growfs /
    meta-data=/dev/mapper/rhel-root  isize=512    agcount=4, agsize=1113856 blks
             =                       sectsz=512   attr=2, projid32bit=1
             =                       crc=1        finobt=0 spinodes=0
    data     =                       bsize=4096   blocks=4455424, 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 4455424 to 9697280
    [root@cib-server1 ~]# df -h

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