现有一台服务器已经安装了操作系统，接上了盘柜以后，需要创建逻辑卷以供系统挂载使用。整个磁盘作为一个分区，CentOS 6.3文件系统有最大16T限制。
首先清除磁盘上的分区表信息：
[root@SD-H0-ATTACH-G0S0 ~]# dd if=/dev/zero of=/dev/sda bs=512 count=1
1+0 records in
1+0 records out
512 bytes (512 B) copied, 0.000446406 s, 1.1 MB/s
创建物理卷
[root@SD-H0-ATTACH-G0S0 ~]# pvcreate /dev/sda
Writing physical volume data to disk "/dev/sda"
Physical volume "/dev/sda" successfully created
[root@SD-H0-ATTACH-G0S0 ~]# pvdisplay
--- Physical volume ---
PV Name /dev/sdb2
VG Name vg_lvs2
PV Size 1.09 TiB / not usable 3.00 MiB
Allocatable yes (but full)
PE Size 4.00 MiB
Total PE 285762
Free PE 0
Allocated PE 285762
PV UUID 93Hrn1-R8m4-fv8S-S7G6-3vpa-N4EH-GOevM9
--- Physical volume ---
PV Name /dev/sda
VG Name vg_mongodb
PV Size 18.19 TiB / not usable 4.00 MiB
Allocatable yes
PE Size 4.00 MiB
Total PE 4767999
Free PE 4767999
Allocated PE 0
PV UUID nUhMM9-S51t-nlKz-wgVS-nkCh-sgXD-Qr4bZv
创建物理卷组
[root@SD-H0-ATTACH-G0S0 ~]# vgcreate vg_mongodb /dev/sda
Volume group "vg_mongodb" successfully created
[root@SD-H0-ATTACH-G0S0 ~]# vgs
VG #PV #LV #SN Attr VSize VFree
vg_lvs2 1 2 0 wz--n- 1.09t 0
vg_mongodb 1 0 0 wz--n- 18.19t 18.19t
创建逻辑卷
[root@SD-H0-ATTACH-G0S0 ~]# lvcreate -l 16T -n lv_mongodb vg_mongodb
Logical volume "lv_mongodb" created
格式化文件系统
[root@SD-H0-ATTACH-G0S0 ~]# mkfs.ext4 /dev/vg_mongodb/lv_mongodb
mke2fs 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
1073741824 inodes, 4294967295 blocks
214748364 blocks (5.00%) reserved for the super user
First data block=0
131072 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, 1934917632,
2560000000, 3855122432
Writing inode tables: done
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done
This filesystem will be automatically checked every 22 mounts or
180 days, whichever comes first. Use tune2fs -c or -i to override.
挂载使用
[root@SD-H0-ATTACH-G0S0 ~]# mount /dev/vg_mongodb/lv_mongodb /dragon/data
[root@SD-H0-ATTACH-G0S0 ~]#
[root@SD-H0-ATTACH-G0S0 ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg_lvs2-lv_root
1.1T 2.5G 1.1T 1% /
tmpfs 7.8G 0 7.8G 0% /dev/shm
/dev/sdb1 485M 58M 402M 13% /boot
/dev/mapper/vg_mongodb-lv_mongodb
16T 129M 15T 1% /dragon/data