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linux扩展根目录磁盘空间(linux lvm )

扩展目标分区前提:
扩展的分区必须要是linux lvm卷如下截图(分区/dev/sda1不可以扩展,分区/dev/sda2可以扩展)
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提示:决定linux lvm的因素是磁盘第一次分区时候选择的分区格式决定的。如下图列出了linux下支持的分区格式
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SSH Secure Shell 3.2.9 (Build 283)
Copyright (c) 2000-2003 SSH Communications Security Corp - http://www.ssh.com/
This copy of SSH Secure Shell is a non-commercial version.
This version does not include PKI and PKCS #11 functionality.
Last login: Fri Dec 18 15:51:53 2015 from 192.168.19.1
 1.查看当前磁盘空间
[root@mail ~]# df -h
Filesystem               Size  Used Avail Use% Mounted on
devtmpfs                 122M     0  122M   0% /dev
tmpfs                    131M     0  131M   0% /dev/shm
tmpfs                    131M  948K  130M   1% /run
tmpfs                    131M     0  131M   0% /sys/fs/cgroup
/dev/mapper/fedora-root   18G  5.2G   12G  33% /
tmpfs                    131M  8.0K  131M   1% /tmp
/dev/sda1                477M   99M  349M  23% /boot
tmpfs                     27M     0   27M   0% /run/user/0
[root@mail ~]# df -h
Filesystem               Size  Used Avail Use% Mounted on
devtmpfs                 122M     0  122M   0% /dev
tmpfs                    131M     0  131M   0% /dev/shm
tmpfs                    131M  948K  130M   1% /run
tmpfs                    131M     0  131M   0% /sys/fs/cgroup
/dev/mapper/fedora-root   18G  5.2G   12G  33% /
tmpfs                    131M  8.0K  131M   1% /tmp
/dev/sda1                477M   99M  349M  23% /boot
tmpfs                     27M     0   27M   0% /run/user/0
[root@mail ~]# fdisk -l
Disk /dev/sda: 30 GiB, 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
Disklabel type: dos
Disk identifier: 0x494832b4
Device     Boot   Start      End  Sectors  Size Id Type
/dev/sda1  *       2048  1026047  1024000  500M 83 Linux
/dev/sda2       1026048 41943039 40916992 19.5G 8e Linux LVM
Disk /dev/mapper/fedora-swap: 2 GiB, 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
Disk /dev/mapper/fedora-root: 17.5 GiB, 18798870528 bytes, 36716544 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@mail ~]# pvdisplay
  --- Physical volume ---
  PV Name               /dev/sda2
  VG Name               fedora
  PV Size               19.51 GiB / not usable 3.00 MiB
  Allocatable           yes (but full)
  PE Size               4.00 MiB
  Total PE              4994
  Free PE               0
  Allocated PE          4994
  PV UUID               WX9LBx-nFSo-mVyM-3INs-T04v-lKg4-kXFiKk
[root@mail ~]# pvcreate /dev/sd
  Device /dev/sd not found (or ignored by filtering).
[root@mail ~]# pvcreate /dev/sd*
  Device /dev/sda not found (or ignored by filtering).
  Can't open /dev/sda1 exclusively.  Mounted filesystem?
  Can't initialize physical volume "/dev/sda2" of volume group "fedora" without -ff
[root@mail ~]# pvcreate /dev/sdb
  Device /dev/sdb not found (or ignored by filtering).
[root@mail ~]# pvdisplay /dev/sda2
  --- Physical volume ---
  PV Name               /dev/sda2
  VG Name               fedora
  PV Size               19.51 GiB / not usable 3.00 MiB
  Allocatable           yes (but full)
  PE Size               4.00 MiB
  Total PE              4994
  Free PE               0
  Allocated PE          4994
  PV UUID               WX9LBx-nFSo-mVyM-3INs-T04v-lKg4-kXFiKk
[root@mail ~]# pvdisplay /dev/sda3
  Failed to find device for physical volume "/dev/sda3".
[root@mail ~]# df -lh
Filesystem               Size  Used Avail Use% Mounted on
devtmpfs                 122M     0  122M   0% /dev
tmpfs                    131M     0  131M   0% /dev/shm
tmpfs                    131M  948K  130M   1% /run
tmpfs                    131M     0  131M   0% /sys/fs/cgroup
/dev/mapper/fedora-root   18G  5.2G   12G  33% /
tmpfs                    131M  8.0K  131M   1% /tmp
/dev/sda1                477M   99M  349M  23% /boot
tmpfs                     27M     0   27M   0% /run/user/0
[root@mail ~]# df -h
Filesystem               Size  Used Avail Use% Mounted on
devtmpfs                 122M     0  122M   0% /dev
tmpfs                    131M     0  131M   0% /dev/shm
tmpfs                    131M  948K  130M   1% /run
tmpfs                    131M     0  131M   0% /sys/fs/cgroup
/dev/mapper/fedora-root   18G  5.2G   12G  33% /
tmpfs                    131M  8.0K  131M   1% /tmp
/dev/sda1                477M   99M  349M  23% /boot
tmpfs                     27M     0   27M   0% /run/user/0
[root@mail ~]# fdisk -l
Disk /dev/sda: 30 GiB, 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
Disklabel type: dos
Disk identifier: 0x494832b4
Device     Boot   Start      End  Sectors  Size Id Type
/dev/sda1  *       2048  1026047  1024000  500M 83 Linux
/dev/sda2       1026048 41943039 40916992 19.5G 8e Linux LVM
Disk /dev/mapper/fedora-swap: 2 GiB, 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
Disk /dev/mapper/fedora-root: 17.5 GiB, 18798870528 bytes, 36716544 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@mail ~]# vgextend fedora /dev/sda2
  Physical volume '/dev/sda2' is already in volume group 'fedora'
  Unable to add physical volume '/dev/sda2' to volume group 'fedora'.
(这里要先添加磁盘分区)
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2.创建磁盘分区
[root@mail ~]# fdisk /dev/sda
Welcome to fdisk (util-linux 2.26.2).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.
Command (m for help): m
Help:
  DOS (MBR)
   a   toggle a bootable flag
   b   edit nested BSD disklabel
   c   toggle the dos compatibility flag
  Generic
   d   delete a partition
   l   list known partition types
   n   add a new partition
   p   print the partition table
   t   change a partition type
   v   verify the partition table
  Misc
   m   print this menu
   u   change display/entry units
   x   extra functionality (experts only)
  Script
   I   load disk layout from sfdisk script file
   O   dump disk layout to sfdisk script file
  Save & Exit
   w   write table to disk and exit
   q   quit without saving changes
  Create a new label
   g   create a new empty GPT partition table
   G   create a new empty SGI (IRIX) partition table
   o   create a new empty DOS partition table
   s   create a new empty Sun partition table
Command (m for help): n
Partition type
   p   primary (2 primary, 0 extended, 2 free)
   e   extended (container for logical partitions)
Select (default p): p
Partition number (3,4, default 3): 3
First sector (41943040-62914559, default 41943040):
Last sector, +sectors or +size{K,M,G,T,P} (41943040-62914559, default 62914559):
Created a new partition 3 of type 'Linux' and of size 10 GiB.
Command (m for help): w
The partition table has been altered.
Calling ioctl() to re-read partition table.
Re-reading the partition table failed.: 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).
[root@mail ~]# df -lh
Filesystem               Size  Used Avail Use% Mounted on
devtmpfs                 122M     0  122M   0% /dev
tmpfs                    131M     0  131M   0% /dev/shm
tmpfs                    131M  948K  130M   1% /run
tmpfs                    131M     0  131M   0% /sys/fs/cgroup
/dev/mapper/fedora-root   18G  5.2G   12G  33% /
tmpfs                    131M  8.0K  131M   1% /tmp
/dev/sda1                477M   99M  349M  23% /boot
tmpfs                     27M     0   27M   0% /run/user/0
3./dev/sda3即是新创建的磁盘
[root@mail ~]# fdisk -l
Disk /dev/sda: 30 GiB, 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
Disklabel type: dos
Disk identifier: 0x494832b4
Device     Boot    Start      End  Sectors  Size Id Type
/dev/sda1  *        2048  1026047  1024000  500M 83 Linux
/dev/sda2        1026048 41943039 40916992 19.5G 8e Linux LVM
/dev/sda3       41943040 62914559 20971520   10G 83 Linux
Disk /dev/mapper/fedora-swap: 2 GiB, 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
Disk /dev/mapper/fedora-root: 17.5 GiB, 18798870528 bytes, 36716544 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
4.把/dev/sda3更改成linux lvm卷(便于加入linux lvm然后空间加入根分区)
[root@mail ~]# fdisk /dev/sda
Welcome to fdisk (util-linux 2.26.2).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.
Command (m for help): n
To create more partitions, first replace a primary with an extended partition.
Command (m for help): p
Disk /dev/sda: 30 GiB, 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
Disklabel type: dos
Disk identifier: 0x494832b4
Device     Boot    Start      End  Sectors  Size Id Type
/dev/sda1  *        2048  1026047  1024000  500M 83 Linux
/dev/sda2        1026048 41943039 40916992 19.5G 8e Linux LVM
/dev/sda3       41943040 62914559 20971520   10G 83 Linux
Command (m for help): 3
3: unknown command
Command (m for help):
Command (m for help): m
Help:
  DOS (MBR)
   a   toggle a bootable flag
   b   edit nested BSD disklabel
   c   toggle the dos compatibility flag
  Generic
   d   delete a partition
   l   list known partition types
   n   add a new partition
   p   print the partition table
   t   change a partition type
   v   verify the partition table
  Misc
   m   print this menu
   u   change display/entry units
   x   extra functionality (experts only)
  Script
   I   load disk layout from sfdisk script file
   O   dump disk layout to sfdisk script file
  Save & Exit
   w   write table to disk and exit
   q   quit without saving changes
  Create a new label
   g   create a new empty GPT partition table
   G   create a new empty SGI (IRIX) partition table
   o   create a new empty DOS partition table
   s   create a new empty Sun partition table
Command (m for help): n
To create more partitions, first replace a primary with an extended partition.
Command (m for help): t
Partition number (1-3, default 3): 3
Partition type (type L to list all types): 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.
Re-reading the partition table failed.: 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).
[root@mail ~]# df -lh
Filesystem               Size  Used Avail Use% Mounted on
devtmpfs                 122M     0  122M   0% /dev
tmpfs                    131M     0  131M   0% /dev/shm
tmpfs                    131M  948K  130M   1% /run
tmpfs                    131M     0  131M   0% /sys/fs/cgroup
/dev/mapper/fedora-root   18G  5.2G   12G  33% /
tmpfs                    131M  8.0K  131M   1% /tmp
/dev/sda1                477M   99M  349M  23% /boot
tmpfs                     27M     0   27M   0% /run/user/0
5./dev/sda3已经成功更改为linux lvm卷
[root@mail ~]# fdisk -l
Disk /dev/sda: 30 GiB, 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
Disklabel type: dos
Disk identifier: 0x494832b4
Device     Boot    Start      End  Sectors  Size Id Type
/dev/sda1  *        2048  1026047  1024000  500M 83 Linux
/dev/sda2        1026048 41943039 40916992 19.5G 8e Linux LVM
/dev/sda3       41943040 62914559 20971520   10G 8e Linux LVM
Disk /dev/mapper/fedora-swap: 2 GiB, 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
Disk /dev/mapper/fedora-root: 17.5 GiB, 18798870528 bytes, 36716544 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@mail ~]# df -T
Filesystem              Type     1K-blocks    Used Available Use% Mounted on
devtmpfs                devtmpfs    124256       0    124256   0% /dev
tmpfs                   tmpfs       133964       0    133964   0% /dev/shm
tmpfs                   tmpfs       133964     948    133016   1% /run
tmpfs                   tmpfs       133964       0    133964   0% /sys/fs/cgroup
/dev/mapper/fedora-root ext4      17938864 5447232  11557336  33% /
tmpfs                   tmpfs       133964       8    133956   1% /tmp
/dev/sda1               ext4        487652  101297    356659  23% /boot
tmpfs                   tmpfs        26796       0     26796   0% /run/user/0
[root@mail ~]# df -TH
Filesystem              Type      Size  Used Avail Use% Mounted on
devtmpfs                devtmpfs  128M     0  128M   0% /dev
tmpfs                   tmpfs     138M     0  138M   0% /dev/shm
tmpfs                   tmpfs     138M  971k  137M   1% /run
tmpfs                   tmpfs     138M     0  138M   0% /sys/fs/cgroup
/dev/mapper/fedora-root ext4       19G  5.6G   12G  33% /
tmpfs                   tmpfs     138M  8.2k  138M   1% /tmp
/dev/sda1               ext4      500M  104M  366M  23% /boot
tmpfs                   tmpfs      28M     0   28M   0% /run/user/0
[root@mail ~]# df -lh
Filesystem               Size  Used Avail Use% Mounted on
devtmpfs                 122M     0  122M   0% /dev
tmpfs                    131M     0  131M   0% /dev/shm
tmpfs                    131M  948K  130M   1% /run
tmpfs                    131M     0  131M   0% /sys/fs/cgroup
/dev/mapper/fedora-root   18G  5.2G   12G  33% /
tmpfs                    131M  8.0K  131M   1% /tmp
/dev/sda1                477M   99M  349M  23% /boot
tmpfs                     27M     0   27M   0% /run/user/0
[root@mail ~]# fdisk -l
Disk /dev/sda: 30 GiB, 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
Disklabel type: dos
Disk identifier: 0x494832b4
Device     Boot    Start      End  Sectors  Size Id Type
/dev/sda1  *        2048  1026047  1024000  500M 83 Linux
/dev/sda2        1026048 41943039 40916992 19.5G 8e Linux LVM
/dev/sda3       41943040 62914559 20971520   10G 8e Linux LVM
Disk /dev/mapper/fedora-swap: 2 GiB, 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
Disk /dev/mapper/fedora-root: 17.5 GiB, 18798870528 bytes, 36716544 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@mail ~]# fdisk /dev/sda
Welcome to fdisk (util-linux 2.26.2).
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: 30 GiB, 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
Disklabel type: dos
Disk identifier: 0x494832b4
Device     Boot    Start      End  Sectors  Size Id Type
/dev/sda1  *        2048  1026047  1024000  500M 83 Linux
/dev/sda2        1026048 41943039 40916992 19.5G 8e Linux LVM
/dev/sda3       41943040 62914559 20971520   10G 8e Linux LVM
Command (m for help): q
[root@mail ~]# df -T
Filesystem              Type     1K-blocks    Used Available Use% Mounted on
devtmpfs                devtmpfs    124256       0    124256   0% /dev
tmpfs                   tmpfs       133964       0    133964   0% /dev/shm
tmpfs                   tmpfs       133964     948    133016   1% /run
tmpfs                   tmpfs       133964       0    133964   0% /sys/fs/cgroup
/dev/mapper/fedora-root ext4      17938864 5447232  11557336  33% /
tmpfs                   tmpfs       133964       8    133956   1% /tmp
/dev/sda1               ext4        487652  101297    356659  23% /boot
tmpfs                   tmpfs        26796       0     26796   0% /run/user/0
6.刷新分区
[root@mail ~]# partprobe
7.格式化/dev/sda3为 ext4格式
[root@mail ~]# mkfs.ext4 /dev/sda3
mke2fs 1.42.12 (29-Aug-2014)
Creating filesystem with 2621440 4k blocks and 655360 inodes
Filesystem UUID: e9cdabd2-d211-4b20-ad89-176c845d56c5
Superblock backups stored on blocks:
        32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632
Allocating group tables: done
Writing inode tables: done
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done
[root@mail ~]# df -lh
Filesystem               Size  Used Avail Use% Mounted on
devtmpfs                 122M     0  122M   0% /dev
tmpfs                    131M     0  131M   0% /dev/shm
tmpfs                    131M  952K  130M   1% /run
tmpfs                    131M     0  131M   0% /sys/fs/cgroup
/dev/mapper/fedora-root   18G  5.2G   12G  33% /
tmpfs                    131M  8.0K  131M   1% /tmp
/dev/sda1                477M   99M  349M  23% /boot
tmpfs                     27M     0   27M   0% /run/user/0
[root@mail ~]# lvs
  LV   VG     Attr       LSize  Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  root fedora -wi-ao---- 17.51g
  swap fedora -wi-ao----  2.00g
8.创建  Physical volume                             
[root@mail ~]# 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
9.把/dev/sda3加入 fedora 组(系统根分区默认组)
[root@mail ~]# vgextend fedora /dev/sda3
  Volume group "fedora" successfully extended
[root@mail ~]# vgdisplay
  --- Volume group ---
  VG Name               fedora
  System ID
  Format                lvm2
  Metadata Areas        2
  Metadata Sequence No  4
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                2
  Open LV               2
  Max PV                0
  Cur PV                2
  Act PV                2
  VG Size               29.50 GiB
  PE Size               4.00 MiB
  Total PE              7553
  Alloc PE / Size       4994 / 19.51 GiB
  Free  PE / Size       2559 / 10.00 GiB
  VG UUID               fsrCEu-vQgr-a0Xx-hiDy-S1QR-pW9Q-2ROFlQ
  10.根分区扩展空间7.69G (命令出错)
[root@mail ~]# lvextend -L +7.96G /dev/VolGroup00/LogVol00 /dev/sda3
  Volume group "VolGroup00" not found
[root@mail ~]# df -lh
Filesystem               Size  Used Avail Use% Mounted on
devtmpfs                 122M     0  122M   0% /dev
tmpfs                    131M     0  131M   0% /dev/shm
tmpfs                    131M  952K  130M   1% /run
tmpfs                    131M     0  131M   0% /sys/fs/cgroup
/dev/mapper/fedora-root   18G  5.2G   12G  33% /
tmpfs                    131M  8.0K  131M   1% /tmp
/dev/sda1                477M   99M  349M  23% /boot
tmpfs                     27M     0   27M   0% /run/user/0
  11.根分区扩展空间10G (出错,可供扩展的空间不足)
[root@mail ~]# lvextend -L +10G /dev/mapper/fedora-root /dev/sda3
  Insufficient free space: 2560 extents needed, but only 2559 available
  12.根分区扩展空间9.8G (成功)
[root@mail ~]# lvextend -L +9.8G /dev/mapper/fedora-root /dev/sda3
  Rounding size to boundary between physical extents: 9.80 GiB
  Size of logical volume fedora/root changed from 17.51 GiB (4482 extents) to 27.31 GiB (6991 extents).
  Logical volume root successfully resized
[root@mail ~]# vim /etc/fstab
#
# /etc/fstab
# Created by anaconda on Sat Jul  4 17:58:53 2015
#
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
/dev/mapper/fedora-root /       ext4    usrquota,grpquota       0       1
UUID=94aed458-ec42-4303-a893-c6effa398adc /boot                   ext4    defaults        1 2
/dev/mapper/fedora-swap swap                    swap    defaults        0 0
~
~
~
~
[root@mail ~]# e2fsck -f /dev/mapper/fedora-root
e2fsck 1.42.12 (29-Aug-2014)
/dev/mapper/fedora-root is mounted.
e2fsck: Cannot continue, aborting.
[root@mail ~]# e2fsck -f /dev/mapper/fedora
e2fsck 1.42.12 (29-Aug-2014)
e2fsck: No such file or directory while trying to open /dev/mapper/fedora
Possibly non-existent device?
[root@mail ~]# df -lh
Filesystem               Size  Used Avail Use% Mounted on
devtmpfs                 122M     0  122M   0% /dev
tmpfs                    131M     0  131M   0% /dev/shm
tmpfs                    131M  952K  130M   1% /run
tmpfs                    131M     0  131M   0% /sys/fs/cgroup
/dev/mapper/fedora-root   18G  5.2G   12G  33% /
tmpfs                    131M  8.0K  131M   1% /tmp
/dev/sda1                477M   99M  349M  23% /boot
tmpfs                     27M     0   27M   0% /run/user/0
13.文件系统重定义分区大小
[root@mail ~]# resize2fs /dev/mapper/fedora-root
resize2fs 1.42.12 (29-Aug-2014)
Filesystem at /dev/mapper/fedora-root is mounted on /; on-line resizing required
old_desc_blocks = 2, new_desc_blocks = 2
The filesystem on /dev/mapper/fedora-root is now 7158784 (4k) blocks long.
14.查看磁盘根目录空间已经成功扩展(18G变为27G)
[root@mail ~]# df -lh
Filesystem               Size  Used Avail Use% Mounted on
devtmpfs                 122M     0  122M   0% /dev
tmpfs                    131M     0  131M   0% /dev/shm
tmpfs                    131M  952K  130M   1% /run
tmpfs                    131M     0  131M   0% /sys/fs/cgroup
/dev/mapper/fedora-root   27G  5.2G   21G  21% /
tmpfs                    131M  8.0K  131M   1% /tmp
/dev/sda1                477M   99M  349M  23% /boot
tmpfs                     27M     0   27M   0% /run/user/0
15.LINUX lvm 卷 根分区扩展结束
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