linux LVM pv vg lv

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新建LV，并mount到指定目录的简单步骤：
从VG新建LV->给LV格式化文件系统->mount到我们需要的目录

前提：
我要从VolGroup00的VG上新建一个名叫vps的LV，大小为100G，要挂在的目录是/vps

1.创建LV

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[root@test~]# lvcreate -L 100G -n vps /dev/VolGroup00
  Logical volume"vps" created

2.确认下我们新建的LV

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[root@test~]# lvdisplay
  --- Logical volume ---
  LV Name               /dev/VolGroup00/LogVol00
  VG Name                VolGroup00
  LV UUID                fDHwa0-IUZV-no5O-RRJB-4N9o-U2MV-TAqucp
  LV Write Access       read/write
  LV Status              available
  # open                 1
  LV Size                15.00 GB
  Current LE             480
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currentlyset to     256
  Block device           253:0
 
  --- Logical volume ---
  LV Name               /dev/VolGroup00/LogVol01
  VG Name                VolGroup00
  LV UUID                cUjKA9-bI60-6R05-K0jS-MdXi-r26d-mfwU8X
  LV Write Access       read/write
  LV Status              available
  # open                 1
  LV Size                5.41 GB
  Current LE             173
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currentlyset to     256
  Block device           253:1
 
  --- Logical volume ---
  LV Name               /dev/VolGroup00/vps <--这就是我们新建的LV
  VG Name                VolGroup00
  LV UUID                pGW8ck-dFTG-QuXb-PL14-3hMO-BUbi-2g8wWE
  LV Write Access       read/write
  LV Status              available
  # open                 0
  LV Size                100.00 GB
  Current LE             3200
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currentlyset to     256
  Block device           253:2

可以看到，已经创建成功了。

3.格式化LV逻辑卷为ext3文件系统格式

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[root@test~]# mkfs.ext3 /dev/VolGroup00/vps
mke2fs 1.39 (29-May-2006)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
13107200 inodes, 26214400 blocks
1310720 blocks (5.00%) reservedfor the super user
First data block=0
Maximum filesystem blocks=0
800 block groups
32768 blocks per group, 32768 fragments per group
16384 inodes per group
Superblock backups stored on blocks:
        32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
        4096000, 7962624, 11239424, 20480000, 23887872
 
Writing inode tables:done
Creating journal (32768 blocks):done
Writing superblocks and filesystem accounting information:done
 
This filesystem will be automatically checked every 32 mounts or
180 days, whichever comes first.  Use tune2fs -c or -i to override.

4.把/dev/VolGroup00/vps挂载到我要挂载的/vps目录

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[root@test~]# mkdir /vps
[root@test~]# mount -t ext3 /dev/VolGroup00/vps /vps
[root@test~]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
                       15G  898M   14G   7% /
/dev/cciss/c0d0p2     19G  238M   18G   2% /var
/dev/cciss/c0d0p1     99M   19M   76M  20% /boot
tmpfs                 2.0G     0  2.0G   0%/dev/shm
/dev/mapper/VolGroup00-vps
                       99G  188M   94G   1%/vps

看最后一行，已经挂载成功了。

5.如果你要开机自动挂载，那么还需要修改/etc/fstab,追加：

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/dev/VolGroup00/vps /vps    ext3    defaults    1 2

重要追记：我使用的CentOS5.6，虽然支持ext4，但是默认装系统的时候还是ext3，如果要用ext4的话，做如下操作，后面的教程我将默认以ext4为例。
1.安装操作ext4的工具

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[root@test~]# yum -y install e4fsprogs

2.在上面第三步格式化的时候，把mkfs.ext3换成mkfs.ext4，当然后几步ext3的地方也要对应的换成ext4。

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[root@test~]# mkfs.ext4 /dev/VolGroup00/vps   

如果要把我们刚才格式化完了的ext3直接转换成ext4，那么执行

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[root@test~]# umount /vps
[root@test~]# e4fsck -fDC0 /dev/VolGroup00/vps
e4fsck 1.41.12 (17-May-2010)
One or moreblock group descriptor checksums are invalid.  Fix<y>? yes
........
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 3A: Optimizing directories
Pass 4: Checking reference counts
Pass 5: Checking group summary information
 
/dev/VolGroup00/vps: ***** FILE SYSTEM WAS MODIFIED *****
/dev/VolGroup00/vps: 11/13107200files (0.0% non-contiguous), 459383/26214400blocks
[root@test~]# tune4fs -O extents,uninit_bg,dir_index /dev/VolGroup00/vps
[root@test~]# mount -t ext4 /dev/VolGroup00/vps /vps

同样别忘记把/etc/fstab这条记录里的ext3改成ext4。

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