服务器LVM磁盘扩容查看磁盘信息启动VMware环境下的Linux*作系统,添加新分区，需要root账号身份。命令行提示

查看磁盘信息
```
fdisk -l
```
启动VMware环境下的Linux*作系统,添加新分区，需要root账号身份。
```
fdisk /dev/sda   # 后边参数为指定的扩容的磁盘
```
1. 命令行提示下输入【m】
2. 输入命令【n】添加新分区。
3. 输入命令【p】创建主分区。
4. 输入【回车】，选择默认大小，这样不浪费空间
5. 输入【回车】，选择默认的start cylinder。
6. 输入【w】，保持修改
重启linux，格式化 /dev/sda3
```
sudo reboot
```

*作示例

[root@master /]# fdisk /dev/sda
 
WARNING: The size of this disk is 3.7 TB (3688303165440 bytes).
DOS partition table format can not be used on drives for volumes
larger than (2199023255040 bytes) for 512-byte sectors. Use parted(1) and GUID
partition table format (GPT).
 
 
WARNING: DOS-compatible mode is deprecated. It's strongly recommended to
         switch off the mode (command 'c') and change display units to
         sectors (command 'u').
 
Command (m for help): p
 
Disk /dev/sda: 3688.3 GB, 3688303165440 bytes
255 heads, 63 sectors/track, 448410 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: 0x00000b93
 
   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1          64      512000   83  Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2              64        2611    20458496   8e  Linux LVM
 
Command (m for help): ^C
[root@master /]# fdisk /dev/sda
 
WARNING: The size of this disk is 3.7 TB (3688303165440 bytes).
DOS partition table format can not be used on drives for volumes
larger than (2199023255040 bytes) for 512-byte sectors. Use parted(1) and GUID
partition table format (GPT).
 
 
WARNING: DOS-compatible mode is deprecated. It's strongly recommended to
         switch off the mode (command 'c') and change display units to
         sectors (command 'u').
 
Command (m for help): n
Command action
   e   extended
   p   primary partition (1-4)
p
Partition number (1-4): 3
First cylinder (2611-448410, default 2611):
Using default value 2611
Last cylinder, +cylinders or +size{K,M,G} (2611-267349, default 267349):
Using default value 267349
 
Command (m for help): p
 
Disk /dev/sda: 3688.3 GB, 3688303165440 bytes
255 heads, 63 sectors/track, 448410 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: 0x00000b93
 
   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1          64      512000   83  Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2              64        2611    20458496   8e  Linux LVM
/dev/sda3            2611      267349  2126509322+  83  Linux
 
Command (m for help): t
Partition number (1-4): 3
Hex code (type L to list codes): 8e
Changed system type of partition 3 to 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.

格式化磁盘

[root@master /]#  mke2fs /dev/sda3
1.41.12 (17-May-2010)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
132907008 inodes, 531627330 blocks
26581366 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=4294967296
16224 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
 
Writing inode tables: done                           
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information:
 
done
 
This filesystem will be automatically checked every 33 mounts or
180 days, whichever comes first.  Use tune2fs -c or -i to override.

查看挂载点

[root@master ~]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/vg_master-lv_root
                       18G   16G  1.1G  94% /
tmpfs                 1.4G   12K  1.4G   1% /dev/shm
/dev/sda1             477M   52M  400M  12% /boot

添加新LVM到已有的LVM组，实现扩容

lvm　　　　　　　　　　　　　　　　　　     进入lvm管理
 
lvm> pvcreate /dev/sda3　　　　　　　　　这是初始化刚才的分区，必须的
 
lvm> vgextend vg_master /dev/sda3　　　将初始化过的分区加入到虚拟卷组vg_master  （查看虚拟卷组命令：vgdisplay）
 
lvm>lvextend -L +29.9G /dev/vg_master/lv_root　　扩展已有卷的容量（29.9G这个数字在后面解释）
 
lvm>pvdisplay　　　　　　　　　　　　　　查看卷容量，这时你会看到一个很大的卷了
 
lvm>quit　　　　　　　　　　　　　　　　　退出

www.cnblogs.com/shijiaoyun/…

上步只是卷扩容了，下面是文件系统的真正扩容

[root@master ~]# resize2fs -p /dev/vg_master/lv_root 30g   //增加分区至30g

再次查看分区信息

[root@master ~]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/vg_master-lv_root
                       30G   16G   13G  55% /
tmpfs                 1.4G   12K  1.4G   1% /dev/shm
/dev/sda1             477M   52M  400M  12% /boo