不损坏数据的情况下 linux磁盘如何扩展 LVM格式

浏览数：21 / 时间：2015年06月20日

方式：LVM方式

第一步增加分区：
1、VM—>编辑设置—>硬盘下扩大磁盘（菜单操作不再赘复）。
2、使用fdisk 命令
fdisk /dev/sda
＃用n命令建个P类型的磁盘，然后用t命令更改ID为8e（LVM类别）。
# p查看一下：
Disk /dev/sda: 17.1 GB, 17179869184 bytes
255 heads, 63 sectors/track, 2088 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id System
/dev/sda1   *           1          13      104391   83 Linux
/dev/sda2              14        1044     8281507+ 8e Linux LVM
/dev/sda3            1045        1545     4024282+ 8e Linux LVM
最后w保存
3、重启一下服务器，不然挂载不上新建的sda3、sda4，

第二步加入VLM:
root#mkfs.ext3 /dev/sda3                   ##格式化新增的分区）

root#lvm
lvm>pvcreate /dev/sda3                     ##创建LVM硬分区
   Physical volume "/dev/sda3" successfully created
lvm> vgextend VolGroup00 /dev/sda3          ##加入与/目录同一个LVM组
   Volume group "VolGroup00" successfully extended
查看一下：
lvm>pvdisplay
   --- Physical volume ---
   PV Name               /dev/sda2
   VG Name               VolGroup00
   PV Size               7.90 GB / not usable 23.41 MB
   Allocatable           yes (but full)
   PE Size (KByte)       32768
   Total PE              252
   Free PE               0
   Allocated PE          252
   PV UUID               ua5FJN-jSLL-bGkp-w0XO-N8JG-MBR0-1yDzGW

--- Physical volume ---
   PV Name               /dev/sda3
   VG Name               VolGroup00
   PV Size               3.84 GB / not usable 25.96 MB
   Allocatable           yes
   PE Size (KByte)       32768
   Total PE              122
   Free PE               122
   Allocated PE          0
   PV UUID               mHKWzk-mQ1o-jkQB-0DZC-PVqW-w2R9-14y19G
把sda3变为LVM的虚拟磁盘（增加容量的关键）
lvm>vgextend /dev/VolGroup00/LogVol102 /dev/sda3
第三步增加 /目录容量
lvm> lvextend -L +3.8G /dev/VolGroup00/LogVol00
   Rounding up size to full physical extent 3.81 GB
   Extending logical volume LogVol00 to 9.69 GB
   Logical volume LogVol00 successfully resized
# resize2fs /dev/VolGroup00/LogVol00        ##还要重新一下识别磁盘容量
resize2fs 1.39 (29-May-2006)
Filesystem at /dev/VolGroup00/LogVol00 is mounted on /; on-line resizing required
Performing an on-line resize of /dev/VolGroup00/LogVol00 to 2539520 (4k) blocks.
The filesystem on /dev/VolGroup00/LogVol00 is now 2539520 blocks long.

最终确认结果：
lvm> lvdisplay
   --- Logical volume ---
   LV Name                /dev/VolGroup00/LogVol00
   VG Name                VolGroup00
   LV UUID                r9eG4x-njBD-z2HT-lmL2-2l81-P3XV-KVd0e4
   LV Write Access        read/write
   LV Status              available
   # open                 1
   LV Size                9.69 GB
   Current LE             310
   Segments               2
   Allocation             inherit
   Read ahead sectors     auto
   - currently set to     256
   Block device           253:0

增加一块新硬盘

1。增加前先关闭VM，然后编辑VM属性，增加一个vritual disk（scsi），其实是增加一个虚拟磁盘文件。

hard disk2就是我新增加的

2。查看目前的磁盘结构

[root@mail ~]# fdisk -l

Disk /dev/sda: 10.7 GB, 10737418240 bytes
255 heads, 63 sectors/track, 1305 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id System
/dev/sda1   *           1          13      104391   83 Linux
/dev/sda2              14         905     7164990   83 Linux

Disk /dev/sdb: 1073 MB, 1073741824 bytes
255 heads, 63 sectors/track, 130 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Disk /dev/sdb doesn‘t contain a valid partition table
//说明磁盘/dev/sdb还没有被系统识别

3。分区

[root@mail ~]# fdisk /dev/sbd

Command (m for help): n //输入m获得帮助信息，n创建分区
Command action
    e   extended
    p   primary partition (1-4)
p //创建主分区
Partition number (1-4): 1 //指定分区的起始柱面
First cylinder (1-130, default 1):
Using default value 1
Last cylinder or +size or +sizeM or +sizeK (1-130, default 130): //设置分区容量，直接回车表示全部
Using default value 130

Command (m for help): t //改变一个分区的系统ID
Selected partition 1
Hex code (type L to list codes): L //查看文件类型对应的Hex

85 Linux extended //linux ext3的hex是85

Hex code (type L to list codes): 85
You cannot change a partition into an extended one or vice versa
Delete it first.

Command (m for help): p //列出当前硬盘的分区

Disk /dev/sdb: 1073 MB, 1073741824 bytes
255 heads, 63 sectors/track, 130 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id System
/dev/sdb1               1         130     1044193+ 83 Linux

Command (m for help): w //保存
The partition table has been altered!

Calling ioctl() to re-read partition table.
Syncing disks.

4。查看现在的分区

[root@mail ~]# fdisk -l

Disk /dev/sda: 10.7 GB, 10737418240 bytes
255 heads, 63 sectors/track, 1305 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id System
/dev/sda1   *           1          13      104391   83 Linux
/dev/sda2              14         905     7164990   83 Linux

Disk /dev/sdb: 1073 MB, 1073741824 bytes
255 heads, 63 sectors/track, 130 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id System
/dev/sdb1               1         130     1044193+ 83 Linux

5。格式化分区

[root@mail ~]# mkfs.ext3 /dev/sdb1 //格式化成ext3格式

6。挂载分区

[root@mail ~]# mount /dev/sdb1 /tmp
[root@mail ~]# df -h /tmp
Filesystem            Size Used Avail Use% Mounted on
/dev/sdb1            1004M 1.3M 952M   1% /tmp

7。自动挂载

修改/etc/fstab

增加一行

/dev/sdb1               /sdb1                   ext3    defaults        0 0
重起