linux - Linux CENTOS7 LVM

Question

这是我的 df -kh 的输出

Filesystem               Size  Used Avail Use% Mounted on
/dev/mapper/centos-root   50G   34G   17G  67% /
devtmpfs                 2.5G     0  2.5G   0% /dev
tmpfs                    2.5G  140K  2.5G   1% /dev/shm
tmpfs                    2.5G  8.9M  2.5G   1% /run
tmpfs                    2.5G     0  2.5G   0% /sys/fs/cgroup
/dev/sda1                497M  133M  365M  27% /boot

我想将 / 的大小增加 194 GB。

我运行了命令 lvextend -L +194G /dev/mapper/centos-root 我收到了文件系统已调整大小的消息。我重新启动了系统。我期待看到我的 / 是 244GB。然而它不是

卷组详细信息

[root@localhost mapper]# vgdisplay
  --- Volume group ---
  VG Name               centos
  System ID             
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  6
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                2
  Open LV               2
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               249.51 GiB
  PE Size               4.00 MiB
  Total PE              63874
  Alloc PE / Size       63648 / 248.62 GiB
  Free  PE / Size       226 / 904.00 MiB
  VG UUID               icZPDf-z0cO-5qMl-Gbtr-XisU-6ptl-cpG3dz

逻辑卷详细信息

[root@localhost mapper]# lvdisplay
  --- Logical volume ---
  LV Path                /dev/centos/swap
  LV Name                swap
  VG Name                centos
  LV UUID                MzofJC-7I6W-XcM9-xwrT-Ns86-LdYt-OYltON
  LV Write Access        read/write
  LV Creation host, time localhost, 2015-07-02 09:04:52 +1200
  LV Status              available
  # open                 2
  LV Size                4.62 GiB
  Current LE             1184
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     8192
  Block device           253:1

  --- Logical volume ---
  LV Path                /dev/centos/root
  LV Name                root
  VG Name                centos
  LV UUID                1J50kj-hcBC-T5rY-y6LV-0xEI-ZVId-qBfgQl
  LV Write Access        read/write
  LV Creation host, time localhost, 2015-07-02 09:04:53 +1200
  LV Status              available
  # open                 1
  LV Size                244.00 GiB
  Current LE             62464
  Segments               2
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     8192
  Block device           253:0



 /etc/fstab OUTPUT

#
# /etc/fstab
# Created by anaconda on Thu Jul  2 09:04:53 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/centos-root /                       xfs     defaults        0 0
UUID=c4f605aa-56b0-4bde-ae0b-ddf6f0e4a983 /boot                   xfs     defaults        0 0
#/dev/mapper/centos-home /home                   xfs     defaults        0 0
/dev/mapper/centos-swap swap                    swap    defaults        0 0

如何扩展 /dev/mapper/centos-root？有什么帮助吗？

score 0 · Accepted Answer

代替“lvextend -L +194G /dev/mapper/centos-root”，使用“lvextend -L +194G -r /dev/mapper/centos-root”。-r 选项只需一步即可更改逻辑卷和关联的文件系统大小。此外，这适用于 ext4 和 xfs。另外，不要使用“df”，使用“lsblk”，显示更清晰。

score -2 · Accepted Answer

啊，我没有碰到这个链接 - https://themacwrangler.wordpress.com/2015/01/16/re-sizing-partitions-in-centos7/。非常有帮助。

我也必须增加我没有的文件系统。好学。

在此处复制上述链接中的页面内容，以防将来无法使用该内容。

Re-sizing partitions in Centos7

By default in a CentOS7 install we get a couple of partitions created for the root user and one for home usually something like this:

# df -h
Filesystem                                   Size  Used Avail Use% Mounted on
/dev/mapper/centos-root                       50G  2.7G   48G   6% /
devtmpfs                                     239M     0  239M   0% /dev
tmpfs                                        246M     0  246M   0% /dev/shm
tmpfs                                        246M   29M  217M  12% /run
tmpfs                                        246M     0  246M   0% /sys/fs/cgroup
/dev/mapper/centos-home                       29G   33M   29G   1% /home
/dev/sda1                                    497M   96M  401M  20% /boot


Note that the root partition is 50Gb and the home partition is 29Gb

Often I find myself wanting or needing to remove the centos-home partition and expand the centos-root partition.

It is a pretty straight forward exercise, but one that I often forget the steps involved.

So here they are:
• First backup any data that might exist in /home so you can restore it later.
• Unmount the centos-home partition.

# umount /home/

• Next show the logical volumes.

# lvdisplay
  --- Logical volume ---
  LV Path                /dev/centos/swap
  LV Name                swap
  VG Name                centos
  LV UUID                azXfXa-YPiG-Bx9x-NfIO-eswN-iHVw-YsXpYe
  LV Write Access        read/write
  LV Creation host, time localhost, 2014-12-01 13:02:00 +1100
  LV Status              available
  # open                 2
  LV Size                1.03 GiB
  Current LE             264
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:1

  --- Logical volume ---
  LV Path                /dev/centos/home
  LV Name                home
  VG Name                centos
  LV UUID                LtYf7h-h1kx-p7OR-ZdN8-2Xo8-KXYT-uC2Roa
  LV Write Access        read/write
  LV Creation host, time localhost, 2014-12-01 13:02:01 +1100
  LV Status              available
  # open                 0
  LV Size                28.48 GiB
  Current LE             7290
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:2

  --- Logical volume ---
  LV Path                /dev/centos/root
  LV Name                root
  VG Name                centos
  LV UUID                DjnSO6-gsbN-g83Q-VhfC-u3Ft-8DqY-sPMx35
  LV Write Access        read/write
  LV Creation host, time localhost, 2014-12-01 13:02:03 +1100
  LV Status              available
  # open                 1
  LV Size                50.00 GiB
  Current LE             12800
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:0

•Now remove the logical volume for centos-home.

# lvremove /dev/centos/home
Do you really want to remove active logical volume home? [y/n]: y
Logical volume "home" successfully removed

•You should now have the free space available in VFree when you have a look using vgs.

# vgs
  VG                #PV #LV #SN Attr   VSize  VFree 
  centos              1   2   0 wz--n- 79.51g 28.48g

• Now resize the centos-root partition.

# lvresize -L +28.47GB /dev/mapper/centos-root 
  Rounding size to boundary between physical extents: 28.47 GiB
  Extending logical volume root to 78.47 GiB
  Logical volume root successfully resized


Note that I expanded the partition by slightly less than the available space, 28.47Gb instead of 28.48Gb, this is just to make sure you avoid hitting an insufficient free space error.
• Grow the partition to use all the free space

#xfs_growfs /dev/mapper/centos-root

• Confirm your new partition size.

# df -h
Filesystem                             Size  Used Avail Use% Mounted on
/dev/mapper/centos-root                 79G  2.7G   76G   4% /
devtmpfs                               239M     0  239M   0% /dev
tmpfs                                  246M     0  246M   0% /dev/shm
tmpfs                                  246M   29M  217M  12% /run
tmpfs                                  246M     0  246M   0% /sys/fs/cgroup
/dev/sda1                              497M   96M  401M  20% /boot

linux - Linux CENTOS7 LVM

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