Linux：为服务器新加一个硬盘，并分配到指定的文件系统

一月 02, 2018

使用 df -h 查看目前磁盘空间和使用情况

[nukc@localhost ~]# df -h
Filesystem                    Size  Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root  886G  712G  130G  85% /
tmpfs                         7.8G   72K  7.8G   1% /dev/shm
/dev/sdb2                     485M   40M  421M   9% /boot
/dev/sdb1                     200M  260K  200M   1% /boot/efi
/dev/mapper/VolGroup-lv_home   20G  172M   19G   1% /home

/dev/mapper/VolGroup-lv_root 已经使用了 85%，是时候扩展容量了，原来的硬盘是 1T 的，也已经分配完了，通过 vgdisplay 命令是可以进行查看是否还有可用空间的。

[nukc@localhost ~]# vgdisplay
  --- Volume group ---
  VG Name               VolGroup
  System ID
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  9
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                3
  Open LV               3
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               930.82 GiB
  PE Size               4.00 MiB
  Total PE              238291
  Alloc PE / Size       238290 / 930.82 GiB
  Free  PE / Size       1 / 4.00 MiB
  VG UUID               OAINo1-Xamg-GhOD-byhH-IMDV-6JPE-W6K9aX

Free 只有 4MB 了，不指望了… 后来，加了个 4T 的硬盘，机房那边说只负责加硬盘，说不会挂载那些，我 fff… 佛慈悲

fdisk -l 列出所有安装的磁盘及分区信息

[nukc@localhost ~]# fdisk -l
WARNING: GPT (GUID Partition Table) detected on '/dev/sda'! The util fdisk doesn                 't support GPT. Use GNU Parted.
Disk /dev/sda: 4000.8 GB, 4000787030016 bytes
255 heads, 63 sectors/track, 486401 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
   Device Boot      Start         End      Blocks   Id  System
/dev/sda1               1      267350  2147483647+  ee  GPT
WARNING: GPT (GUID Partition Table) detected on '/dev/sdb'! The util fdisk doesn                 't support GPT. Use GNU Parted.
Disk /dev/sdb: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0x00000000
   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1               1      121602   976762583+  ee  GPT
Partition 1 does not start on physical sector boundary.
Disk /dev/mapper/VolGroup-lv_root: 969.6 GB, 969614032896 bytes
255 heads, 63 sectors/track, 117882 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0x00000000
Disk /dev/mapper/VolGroup-lv_swap: 8371 MB, 8371830784 bytes
255 heads, 63 sectors/track, 1017 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0x00000000
WARNING: GPT (GUID Partition Table) detected on '/dev/mapper/ddf1_44656c6c202020                 201000005b10281f38460f100c210e2867'! The util fdisk doesn't support GPT. Use GNU                  Parted.
Disk /dev/mapper/ddf1_44656c6c202020201000005b10281f38460f100c210e2867: 4000.2 G                 B, 4000225165312 bytes
255 heads, 63 sectors/track, 486333 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
                                                             Device Boot      St                 art         End      Blocks   Id  System
/dev/mapper/ddf1_44656c6c202020201000005b10281f38460f100c210e2867p1                                1      267350  2147483647+  ee  GPT
Disk /dev/mapper/ddf1_44656c6c202020201000005b10281f38460f100c210e2867p1: 4000.2                  GB, 4000223068160 bytes
255 heads, 63 sectors/track, 486332 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Disk /dev/mapper/VolGroup-lv_home: 21.5 GB, 21474836480 bytes
255 heads, 63 sectors/track, 2610 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0x00000000

接下是错误的过程，如果不想看，可以直接跳转到正确的姿势。

看到 warning 了，WARNING: GPT (GUID Partition Table) detected on '/dev/sda'! The util fdisk doesn 't support GPT. Use GNU Parted. 我可不是专业的，先 google,

搜索结果如下：

2 种分区表：
MBR 分区表：（MBR 含义：主引导记录）
所支持的最大卷：2T （T; terabytes,1TB=1024GB）
对分区的设限：最多 4 个主分区或 3 个主分区加一个扩展分区。

GPT 分区表：（GPT 含义：GUID 分区表）
支持最大卷：18EB，（E：exabytes,1EB=1024TB）
每个磁盘最多支持 128 个分区

如果要大于 2TB 的卷或分区就必须得用 GPT 分区表。

Linux 下 fdisk 工具不支持 GPT，得使用另一个 GNU 发布的强大分区工具 parted。fdisk 工具用的话，会有那个的警告信息。

根据我之前找到的资料，接下来就是使用 parted 进行硬盘分区。

[nukc@localhost ~]# parted /dev/sda
GNU Parted 2.1
使用 /dev/sda
Welcome to GNU Parted! Type 'help' to view a list of commands.
	(parted) mklabel gpt  (用gpt格式可以将3TB弄在一个分区里) 
警告: The existing disk label on /dev/sda will be destroyed and all data on this
disk will be lost. Do you want to continue?
是/Yes/否/No? y
	(parted) unit TB  (设置单位为TB) 
	(parted) print (显示设置的分区大小）
Model: ATA ST4000NM0035-1V4 (scsi)
Disk /dev/sda: 4.00TB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Number  Start  End  Size  File system  Name  标志
	(parted) mkpart primary 0 4   (设置为一个主分区,大小为 4TB，开始是 0，结束是 4）
	(parted) print  (显示设置的分区大小）
Model: ATA ST4000NM0035-1V4 (scsi)
Disk /dev/sda: 4.00TB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Number  Start   End     Size    File system  Name     标志
 1      0.00TB  4.00TB  4.00TB  ext4         primary
(parted) quit  (退出 parted 程序)  
信息: You may need to update /etc/fstab

接着格式化分区

[nukc@localhost ~]# mkfs.ext4 /dev/sda1
mke2fs 1.41.12 (17-May-2010)
/dev/sda1 is apparently in use by the system; will not make a 文件系统 here!

/dev/sda1 正在被使用，解决办法：

[nukc@localhost ~]# dmsetup status
VolGroup-lv_swap: 0 16351232 linear
VolGroup-lv_root: 0 104857600 linear
VolGroup-lv_root: 104857600 1788919808 linear
ddf1_44656c6c202020201000005b10281f38460f100c210e2867: 0 7812939776 linear
ddf1_44656c6c202020201000005b10281f38460f100c210e2867p1: 0 7812935680 linear
VolGroup-lv_home: 0 41943040 linear
[nukc@localhost ~]# dmsetup remove_all

[nukc@localhost ~]# mkfs.ext4 /dev/sda1
mke2fs 1.41.12 (17-May-2010)
文件系统标签=
操作系统:Linux
块大小=4096 (log=2)
分块大小=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
244195328 inodes, 976754176 blocks
48837708 blocks (5.00%) reserved for the super user
第一个数据块=0
Maximum filesystem blocks=4294967296
29809 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks:
        32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
        4096000, 7962624, 11239424, 20480000, 23887872, 71663616, 78675968,
        102400000, 214990848, 512000000, 550731776, 644972544
正在写入inode表: 完成
Creating journal (32768 blocks): 完成
Writing superblocks and filesystem accounting information: mount /dev/sda1 /usr/                 local/data
完成
This filesystem will be automatically checked every 29 mounts or
180 days, whichever comes first.  Use tune2fs -c or -i to override.

然后我乖乖的进行了挂载 mount

[nukc@localhost ~]# mount /dev/sda1 /usr/local/data
[nukc@localhost ~]# df -h
Filesystem                    Size  Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root  886G  712G  130G  85% /
tmpfs                         7.8G   72K  7.8G   1% /dev/shm
/dev/sdb2                     485M   40M  421M   9% /boot
/dev/sdb1                     200M  260K  200M   1% /boot/efi
/dev/mapper/VolGroup-lv_home   20G  172M   19G   1% /home
/dev/sda1                     3.6T  196M  3.4T   1% /usr/local/data

到了这里，我的想法就是把 /dev/sda1 的 size 减少，然后加到 /dev/mapper/VolGroup-lv_root 上。

以下就是实际操作的过程：

[nukc@localhost ~]# lvreduce -L 3.3T /dev/sda1
  Path required for Logical Volume "sda1".
  Please provide a volume group name
  Run `lvreduce --help' for more information.
[nukc@localhost ~]# umount /dev/sda1
[nukc@localhost ~]# lvreduce -L 3.3T /dev/sda1
  Path required for Logical Volume "sda1".
  Please provide a volume group name
  Run `lvreduce --help' for more information.

[nukc@localhost ~]# pvcreate /dev/sda1
  Physical volume "/dev/sda1" successfully created
You have new mail in /var/spool/mail/root
[nukc@localhost ~]# vgcreate mygroup /dev/sda1
  Volume group "mygroup" successfully created
[nukc@localhost ~]# bgdisplay mygroup | grep "Total PE"
-bash: bgdisplay: command not found
[nukc@localhost ~]# vgdisplay mygroup | grep "Total PE"
  Total PE              953861
[nukc@localhost ~]# lvcreate -l 953861 mygroup -n data
  Logical volume "data" created.
[nukc@localhost ~]# df -h
Filesystem                    Size  Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root  886G  712G  130G  85% /
tmpfs                         7.8G   72K  7.8G   1% /dev/shm
/dev/sdb2                     485M   40M  421M   9% /boot
/dev/sdb1                     200M  260K  200M   1% /boot/efi
/dev/mapper/VolGroup-lv_home   20G  172M   19G   1% /home
[nukc@localhost ~]# mkfs.ext4 /dev/mygroup/data
mke2fs 1.41.12 (17-May-2010)
文件系统标签=
操作系统:Linux
块大小=4096 (log=2)
分块大小=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
244195328 inodes, 976753664 blocks
48837683 blocks (5.00%) reserved for the super user
第一个数据块=0
Maximum filesystem blocks=4294967296
29809 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks:
        32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
        4096000, 7962624, 11239424, 20480000, 23887872, 71663616, 78675968,
        102400000, 214990848, 512000000, 550731776, 644972544
正在写入inode表: 完成
Creating journal (32768 blocks): 完成
Writing superblocks and filesystem accounting information:
完成
This filesystem will be automatically checked every 37 mounts or
180 days, whichever comes first.  Use tune2fs -c or -i to override.
[nukc@localhost ~]# mount -a
[nukc@localhost ~]# df -h
Filesystem                    Size  Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root  886G  712G  130G  85% /
tmpfs                         7.8G   72K  7.8G   1% /dev/shm
/dev/sdb2                     485M   40M  421M   9% /boot
/dev/sdb1                     200M  260K  200M   1% /boot/efi
/dev/mapper/VolGroup-lv_home   20G  172M   19G   1% /home
/dev/mapper/mygroup-data      3.6T  196M  3.4T   1% /usr/local/data

又重新挂载了一次。。。

[nukc@localhost ~]# umount /usr/local/data
[nukc@localhost ~]# df -h
Filesystem                    Size  Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root  886G  712G  130G  85% /
tmpfs                         7.8G   72K  7.8G   1% /dev/shm
/dev/sdb2                     485M   40M  421M   9% /boot
/dev/sdb1                     200M  260K  200M   1% /boot/efi
/dev/mapper/VolGroup-lv_home   20G  172M   19G   1% /home
[nukc@localhost ~]# resize2fs -p /dev/mapper/mygroup-data 10G
resize2fs 1.41.12 (17-May-2010)
请先运行 'e2fsck -f /dev/mapper/mygroup-data'.
[nukc@localhost ~]# e2fsck -f /dev/mapper/mygroup-data
e2fsck 1.41.12 (17-May-2010)
第一步: 检查inode,块,和大小
第二步: 检查目录结构
第3步: 检查目录连接性
Pass 4: Checking reference counts
第5步: 检查簇概要信息
/dev/mapper/mygroup-data: 11/244195328 files (0.0% non-contiguous), 15377150/976                 753664 blocks
[nukc@localhost ~]# resize2fs -p /dev/mapper/mygroup-data 10G
resize2fs 1.41.12 (17-May-2010)
Resizing the filesystem on /dev/mapper/mygroup-data to 2621440 (4k) blocks.
Begin pass 2 (max = 32768)
正在重定位块            XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Begin pass 3 (max = 29809)
正在扫描inode表          XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
The filesystem on /dev/mapper/mygroup-data is now 2621440 blocks long.
[nukc@localhost ~]# mount /usr/local/data
[nukc@localhost ~]# df -h
Filesystem                    Size  Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root  886G  712G  130G  85% /
tmpfs                         7.8G   72K  7.8G   1% /dev/shm
/dev/sdb2                     485M   40M  421M   9% /boot
/dev/sdb1                     200M  260K  200M   1% /boot/efi
/dev/mapper/VolGroup-lv_home   20G  172M   19G   1% /home
/dev/mapper/mygroup-data      9.9G  164M  9.2G   2% /usr/local/data

确实减到了 10G，但是接下来却又发生了点事情。

[nukc@localhost ~]# lvreduce -L 3.5T /dev/mapper/mygroup-data
  WARNING: Reducing active and open logical volume to 3.50 TiB.
  THIS MAY DESTROY YOUR DATA (filesystem etc.)
Do you really want to reduce mygroup/data? [y/n]: y
  Size of logical volume mygroup/data changed from 3.64 TiB (953861 extents) to 3.50 TiB (917504 extents).
  Logical volume data successfully resized.
You have new mail in /var/spool/mail/root
[nukc@localhost ~]# df -h
Filesystem                    Size  Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root  886G  712G  130G  85% /
tmpfs                         7.8G   72K  7.8G   1% /dev/shm
/dev/sdb2                     485M   40M  421M   9% /boot
/dev/sdb1                     200M  260K  200M   1% /boot/efi
/dev/mapper/VolGroup-lv_home   20G  172M   19G   1% /home
/dev/mapper/mygroup-data      9.9G  164M  9.2G   2% /usr/local/data
[nukc@localhost ~]# vgdisplay
  --- Volume group ---
  VG Name               VolGroup
  System ID
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  9
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                3
  Open LV               3
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               930.82 GiB
  PE Size               4.00 MiB
  Total PE              238291
  Alloc PE / Size       238290 / 930.82 GiB
  Free  PE / Size       1 / 4.00 MiB
  VG UUID               OAINo1-Xamg-GhOD-byhH-IMDV-6JPE-W6K9aX
  --- Volume group ---
  VG Name               mygroup
  System ID
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  3
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                1
  Open LV               1
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               3.64 TiB
  PE Size               4.00 MiB
  Total PE              953861
  Alloc PE / Size       917504 / 3.50 TiB
  Free  PE / Size       36357 / 142.02 GiB
  VG UUID               72Tki3-3lO0-1c9D-bppy-zTlw-PM2c-QE2bZZ

mygroup 的 Free PE 只有 142.02 GB，出现问题了，umount 之后再试一次

[nukc@localhost ~]# umount /dev/mapper/mygroup-data
[nukc@localhost ~]# resize2fs -p /dev/mapper/mygroup-data
resize2fs 1.41.12 (17-May-2010)
请先运行 'e2fsck -f /dev/mapper/mygroup-data'.
[nukc@localhost ~]# e2fsck -f /dev/mapper/mygroup-data
e2fsck 1.41.12 (17-May-2010)
第一步: 检查inode,块,和大小
第二步: 检查目录结构
第3步: 检查目录连接性
Pass 4: Checking reference counts
第5步: 检查簇概要信息
/dev/mapper/mygroup-data: 11/655360 files (0.0% non-contiguous), 83119/2621440 blocks
[nukc@localhost ~]# resize2fs -p /dev/mapper/mygroup-data
resize2fs 1.41.12 (17-May-2010)
Resizing the filesystem on /dev/mapper/mygroup-data to 939524096 (4k) blocks.
Begin pass 1 (max = 28592)
正在扩充inode表          XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
The filesystem on /dev/mapper/mygroup-data is now 939524096 blocks long.
You have new mail in /var/spool/mail/root
[nukc@localhost ~]# df -h
Filesystem                    Size  Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root  886G  713G  129G  85% /
tmpfs                         7.8G   72K  7.8G   1% /dev/shm
/dev/sdb2                     485M   40M  421M   9% /boot
/dev/sdb1                     200M  260K  200M   1% /boot/efi
/dev/mapper/VolGroup-lv_home   20G  172M   19G   1% /home
You have new mail in /var/spool/mail/root
[nukc@localhost ~]# mount /dev/mapper/mygroup-data
[nukc@localhost ~]# df -h
Filesystem                    Size  Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root  886G  713G  129G  85% /
tmpfs                         7.8G   72K  7.8G   1% /dev/shm
/dev/sdb2                     485M   40M  421M   9% /boot
/dev/sdb1                     200M  260K  200M   1% /boot/efi
/dev/mapper/VolGroup-lv_home   20G  172M   19G   1% /home
/dev/mapper/mygroup-data      3.5T  197M  3.3T   1% /usr/local/data
[nukc@localhost ~]# umount /usr/local/data
[nukc@localhost ~]# resize2fs -p /dev/mapper/mygroup-data 10G
resize2fs 1.41.12 (17-May-2010)
请先运行 'e2fsck -f /dev/mapper/mygroup-data'.
[nukc@localhost ~]# e2fsck -f /dev/mapper/mygroup-data
e2fsck 1.41.12 (17-May-2010)
第一步: 检查inode,块,和大小
第二步: 检查目录结构
第3步: 检查目录连接性
Pass 4: Checking reference counts
第5步: 检查簇概要信息
/dev/mapper/mygroup-data: 11/234881024 files (0.0% non-contiguous), 14792732/939524096 blocks
[nukc@localhost ~]# resize2fs -p /dev/mapper/mygroup-data 10G
resize2fs 1.41.12 (17-May-2010)
Resizing the filesystem on /dev/mapper/mygroup-data to 2621440 (4k) blocks.
Begin pass 3 (max = 28672)
正在扫描inode表          XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
The filesystem on /dev/mapper/mygroup-data is now 2621440 blocks long.
You have new mail in /var/spool/mail/root
[nukc@localhost ~]# mount /usr/local/data
[nukc@localhost ~]# df -h
Filesystem                    Size  Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root  886G  713G  129G  85% /
tmpfs                         7.8G   72K  7.8G   1% /dev/shm
/dev/sdb2                     485M   40M  421M   9% /boot
/dev/sdb1                     200M  260K  200M   1% /boot/efi
/dev/mapper/VolGroup-lv_home   20G  172M   19G   1% /home
/dev/mapper/mygroup-data      9.9G  164M  9.2G   2% /usr/local/data
[nukc@localhost ~]# lvreduce -L 10G /dev/mapper/mygroup-data
  WARNING: Reducing active and open logical volume to 10.00 GiB.
  THIS MAY DESTROY YOUR DATA (filesystem etc.)
Do you really want to reduce mygroup/data? [y/n]: y
  Size of logical volume mygroup/data changed from 3.50 TiB (917504 extents) to 10.00 GiB (2560 extents).
  Logical volume data successfully resized.
[nukc@localhost ~]# vgdisplay
  --- Volume group ---
  VG Name               VolGroup
  System ID
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  9
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                3
  Open LV               3
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               930.82 GiB
  PE Size               4.00 MiB
  Total PE              238291
  Alloc PE / Size       238290 / 930.82 GiB
  Free  PE / Size       1 / 4.00 MiB
  VG UUID               OAINo1-Xamg-GhOD-byhH-IMDV-6JPE-W6K9aX
  --- Volume group ---
  VG Name               mygroup
  System ID
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  4
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                1
  Open LV               1
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               3.64 TiB
  PE Size               4.00 MiB
  Total PE              953861
  Alloc PE / Size       2560 / 10.00 GiB
  Free  PE / Size       951301 / 3.63 TiB
  VG UUID               72Tki3-3lO0-1c9D-bppy-zTlw-PM2c-QE2bZZ

现在 Free PE 有 3.63TB 了

1
2
3

[nukc@localhost ~]# lvextend -L +3.63TiB /dev/mapper/VolGroup-lv_root
  Rounding size to boundary between physical extents: 3.63 TiB.
  Insufficient free space: 951583 extents needed, but only 1 available

卧槽，不行，说是只有 1 可用。。。然后想了下，可能是不同的 Volume group 不能这样分配。那就重新来过，删除之前创建的 mygroup 。

[nukc@localhost ~]# vgs
  VG       #PV #LV #SN Attr   VSize   VFree
  VolGroup   1   3   0 wz--n- 930.82g 4.00m
  mygroup    1   1   0 wz--n-   3.64t 3.63t

[nukc@localhost ~]# umount /usr/local/data
[nukc@localhost ~]# lvremove /dev/mapper/mygroup-data
Do you really want to remove active logical volume data? [y/n]: y
  Logical volume "data" successfully removed
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[nukc@localhost ~]# vgremove mygroup
  Volume group "mygroup" successfully removed
[nukc@localhost ~]# vgs
  VG       #PV #LV #SN Attr   VSize   VFree
  VolGroup   1   3   0 wz--n- 930.82g 4.00m

好了，已经删除了。

正确姿势

搞了那么多，之前都是不对。之前通过 fdisk -l 知道了有个 4T 的硬盘 /dev/sda1 ，通过 vgs命令知道了 VolGroup 这个 Volume group 。然后就是直接把 /dev/sda1 直接拓展到 VolGroup 。

[nukc@localhost ~]# vgextend VolGroup /dev/sda1
  Volume group "VolGroup" successfully extended
[nukc@localhost ~]# vgs
  VG       #PV #LV #SN Attr   VSize VFree
  VolGroup   2   3   0 wz--n- 4.55t 3.64t
[nukc@localhost ~]# vgdisplay
  --- Volume group ---
  VG Name               VolGroup
  System ID
  Format                lvm2
  Metadata Areas        2
  Metadata Sequence No  10
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                3
  Open LV               3
  Max PV                0
  Cur PV                2
  Act PV                2
  VG Size               4.55 TiB
  PE Size               4.00 MiB
  Total PE              1192152
  Alloc PE / Size       238290 / 930.82 GiB
  Free  PE / Size       953862 / 3.64 TiB
  VG UUID               OAINo1-Xamg-GhOD-byhH-IMDV-6JPE-W6K9aX

这次算是 OK 了，接下来就是把 Free 的空间加到 /dev/mapper/VolGroup-lv_root

[nukc@localhost ~]# lvextend -L +3.64TiB /dev/mapper/VolGroup-lv_root
  Rounding size to boundary between physical extents: 3.64 TiB.
  Insufficient free space: 954205 extents needed, but only 953862 available
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[nukc@localhost ~]# lvextend -L +3.60TiB /dev/mapper/VolGroup-lv_root
  Rounding size to boundary between physical extents: 3.60 TiB.
  Size of logical volume VolGroup/lv_root changed from 903.02 GiB (231174 extents) to 4.48 TiB (1174893 extents).
  Logical volume lv_root successfully resized.
[nukc@localhost ~]# resize2fs -p /dev/mapper/VolGroup-lv_root
resize2fs 1.41.12 (17-May-2010)
Filesystem at /dev/mapper/VolGroup-lv_root is mounted on /; on-line resizing required
old desc_blocks = 57, new_desc_blocks = 287
Performing an on-line resize of /dev/mapper/VolGroup-lv_root to 1203090432 (4k) blocks.

最后就是等最后那个命令完成，要是突然中断了，只要再执行一次最后那个命令就好。

[nukc@localhost ~]# df -h
Filesystem                    Size  Used Avail Use% Mounted on
/dev/mapper/VolGroup-lv_root  4.5T  714G  3.5T  17% /
tmpfs                         7.8G   72K  7.8G   1% /dev/shm
/dev/sdb2                     485M   40M  421M   9% /boot
/dev/sdb1                     200M  260K  200M   1% /boot/efi
/dev/mapper/VolGroup-lv_home   20G  172M   19G   1% /home
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