Centos7 XFS根分区扩容，非LVM

虚机磁盘分区之后就xfs格式化了，给根目录扩容10G

[root@y_zilong ~]# lsblk    #查看磁盘空间
NAME   MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sda      8:0    0   30G  0 disk 
├─sda1   8:1    0  300M  0 part /boot
├─sda2   8:2    0    2G  0 part [SWAP]
└─sda3   8:3    0 17.7G  0 part /
[root@y_zilong ~]# df -Th |grep sda3      #查看文件系统的信息
/dev/sda3      xfs        18G  3.7G   15G  21% /
[root@y_zilong ~]# #因为内容不重要，直接扩容，不在备份

下面开始扩容步骤

 

一、卸载分区

[root@y_zilong ~]# umount /dev/sda3
umount: /: target is busy.
        (In some cases useful info about processes that use
         the device is found by lsof(8) or fuser(1))
[root@y_zilong ~]# 根分区卸载不掉那就不卸载了

二、使用fdisk修改分区容量

[root@y_zilong ~]# 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: 32.2 GB, 32212254720 bytes, 62914560 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: 0x000b70b3

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048      616447      307200   8e  Linux LVM
/dev/sda2          616448     4810751     2097152   82  Linux swap / Solaris
/dev/sda3         4810752    61433855    28311552   83  Linux

Command (m for help): d
Partition number (1-3, default 3): 3
Partition 3 is deleted

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 (4810752-62914559, default 4810752): 
Using default value 4810752
Last sector, +sectors or +size{K,M,G} (4810752-62914559, default 62914559): 
Using default value 62914559
Partition 3 of type Linux and of size 27.7 GiB is set

Command (m for help): p

Disk /dev/sda: 32.2 GB, 32212254720 bytes, 62914560 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: 0x000b70b3

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048      616447      307200   8e  Linux LVM
/dev/sda2          616448     4810751     2097152   82  Linux swap / Solaris
/dev/sda3         4810752    62914559    29051904   83  Linux

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@y_zilong ~]# partprobe               #不管用，必须reboot重启
Error: Partition(s) 3 on /dev/sda have been written, but we have been unable to inform the kernel of the change, probably because it/they are in use.  As a result, the old partition(s) will remain in use.  You should reboot now before making further changes.
Warning: Unable to open /dev/sr0 read-write (Read-only file system).  /dev/sr0 has been opened read-only.
[root@y_zilong ~]# lsblk
NAME   MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sda      8:0    0   30G  0 disk 
├─sda1   8:1    0  300M  0 part /boot
├─sda2   8:2    0    2G  0 part [SWAP]
└─sda3   8:3    0 17.7G  0 part /
sr0     11:0    1  4.5G  0 rom  
#重启之后
[root@y_zilong ~]# lsblk
NAME   MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sda      8:0    0   30G  0 disk 
├─sda1   8:1    0  300M  0 part /boot
├─sda2   8:2    0    2G  0 part [SWAP]
└─sda3   8:3    0 27.7G  0 part /           #磁盘分区空间变为了27.7，增加了10G
sr0     11:0    1  4.5G  0 rom  
[root@y_zilong ~]# 

三、扩容文件系统

分区已经扩容到27.7G了，文件系统还是原来的大小，现在扩容文件系统

[root@y_zilong ~]# df -Th
Filesystem     Type      Size  Used Avail Use% Mounted on
/dev/sda3      xfs        18G  3.6G   15G  21% /
devtmpfs       devtmpfs  1.7G     0  1.7G   0% /dev
tmpfs          tmpfs     1.8G   84K  1.8G   1% /dev/shm
tmpfs          tmpfs     1.8G  9.0M  1.8G   1% /run
tmpfs          tmpfs     1.8G     0  1.8G   0% /sys/fs/cgroup
/dev/sda1      xfs       297M  152M  146M  51% /boot
tmpfs          tmpfs     351M   16K  351M   1% /run/user/42
tmpfs          tmpfs     351M     0  351M   0% /run/user/0

[root@y_zilong ~]# xfs_growfs /    #扩展XFS文件系统！！！

meta-data=/dev/sda3              isize=512    agcount=4, agsize=1160384 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=1        finobt=0 spinodes=0
data     =                       bsize=4096   blocks=4641536, 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 4641536 to 7262976

#！！!要是提示只读
           [root@y_zilong ~]# mount -o remount rw /     #改为读写
然后在     [root@y_zilong ~]# xfs_growfs /
！！！

[root@y_zilong ~]# df -Th
Filesystem     Type      Size  Used Avail Use% Mounted on
/dev/sda3      xfs        28G  3.6G   25G  13% /                #文件系统变为了28G
devtmpfs       devtmpfs  1.7G     0  1.7G   0% /dev
tmpfs          tmpfs     1.8G   84K  1.8G   1% /dev/shm
tmpfs          tmpfs     1.8G  9.0M  1.8G   1% /run
tmpfs          tmpfs     1.8G     0  1.8G   0% /sys/fs/cgroup
/dev/sda1      xfs       297M  152M  146M  51% /boot
tmpfs          tmpfs     351M   16K  351M   1% /run/user/42
tmpfs          tmpfs     351M     0  351M   0% /run/user/0
[root@y_zilong ~]#