先看一下文档：
创建PV
[root@z1~]# pvcreate /dev/sdb1
[root@z1~]# pvcreate /dev/sdc1
查看PV [root@z1~]# pvdisplay
创建卷组VG
[root@z1~]# vgcreate myvg1 /dev/sdb1 /dev/sdc1
查看VG
[root@z1~]#vgdisplay
创建逻辑卷LV
[root@z1~]# lvcreate –l 40 –n mylv1 myvg1
查看LV
[root@z1~]# lvdisplay
LV格式化成ext3文件格式
[root@z1~]# mkfs.ext3 /dev/myvg1/mylv1
创建目录 [
root@z1~]# mkdir /mylv1mut
挂载
[root@z1~]# mount /dev/myvg1/mylv1 /mylv1mnt
对挂载的逻辑卷进行扩容
Ls –lh
查看容量
[root@z1~]# lvextend –L +50M /dev/myvg1/mylv1
查看分区使用情况
[root@z1~]# df –h
对mylv1进行在线扩容
[root@z1~]# resize2fs /dev/myvg1/mylv1
对为挂载的逻辑卷进行扩容
[root@z1~]# lvextend –L +70M /dev/myvg1/mylv2
[root@z1~]# mount /dev/myvg1/mylv2 /mylv2mnt
[root@z1~]# umount /mylv2mnt
[root@z1~]# resize2fs /dev/myvg1/mylv2
[root@z1~]# e2fsck –f /dev/myvg1/mylv2 (注意在mount 状态下fsck 会破坏文件系统)
[root@z1~]# resize2fs /dev/myvg1/mylv2
[root@z1~]# mount /dev/myvg1/mylv2 /mylv2mnt/
[root@z1~]# df –h
对VG进行扩容(一)
[root@z1~]# partprobe
[root@z1~]# pvcreate /dev/sdb2
[root@z1~]# vgextend myvg1 /dev/sdb2
对VG进行扩容(二)
[root@z1~]# pvcreate /dev/sdb3
[root@z1~]# pvcreate /dev/sdc2
[root@z1~]# vgcreate /dev/sdb3 /dev/sdc2
[root@z1~]# vgmerge myvg1 myvg2
-------
下面开始操作：
关于在disk 上见pv,pg 的操作实践：
Step1:
现在 虚拟机关机的情况下增加两块 scsi 盘。
Step2； 建pv:
[root@aoracle ~]# pvcreate /dev/sdd
Physical volume "/dev/sdd" successfully created
[root@aoracle ~]# pvcreate /dev/sde
Physical volume "/dev/sde" successfully created
好，下面查看一下：
[root@aoracle ~]# pvdisplay
/dev/cdrom: open failed: No medium found
"/dev/sdd" is a new physical volume of "2.00 GB"
--- NEW Physical volume ---
PV Name /dev/sdd
VG Name
PV Size 2.00 GB
Allocatable NO
PE Size (KByte) 0
Total PE 0
Free PE 0
Allocated PE 0
PV UUID b3d2fB-QeQQ-05UV-KLAF-2AB4-Gpfw-5kbsOu
"/dev/sde" is a new physical volume of "2.00 GB"
--- NEW Physical volume ---
PV Name /dev/sde
VG Name
PV Size 2.00 GB
Allocatable NO
PE Size (KByte) 0
Total PE 0
Free PE 0
Allocated PE 0
PV UUID r0pBoP-a6rC-CGsb-UEZR-3bXN-fwj3-wsK2GA
Step3: 创建卷组vg: 并且查看：
[root@aoracle ~]# vgcreate myvg1 /dev/sdd /dev/sde
Volume group "myvg1" successfully created
[root@aoracle ~]# vgdisplay
--- Volume group ---
VG Name myvg1
System ID
Format lvm2
Metadata Areas 2
Metadata Sequence No 1
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 0
Open LV 0
Max PV 0
Cur PV 2
Act PV 2
VG Size 3.99 GB
PE Size 4.00 MB
Total PE 1022
Alloc PE / Size 0 / 0
Free PE / Size 1022 / 3.99 GB
VG UUID Y4wahX-Q3IW-iagV-S2o0-x0b9-sOzW-AXu1u4
Step4:
创建 逻辑卷：
[root@aoracle ~]# lvcreate -l 40 -n mylv1 myvg1
Logical volume "mylv1" created
[root@aoracle ~]# lvdisplay
--- Logical volume ---
LV Name /dev/myvg1/mylv1
VG Name myvg1
LV UUID k0rYqH-yZFf-BzOl-BtEc-30Z8-Q98S-G2Gz0i
LV Write Access read/write
LV Status available
# open 0
LV Size 160.00 MB
Current LE 40
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:0
[root@aoracle ~]#
可以lvcreate --help 看到每个参数的意思：
lvcreate -s|--snapshot
[-c|--chunksize]
[-A|--autobackup {y|n}]
[--addtag Tag]
[--alloc AllocationPolicy]
[-C|--contiguous {y|n}]
[-d|--debug]
[-h|-?|--help]
[-i|--stripes Stripes [-I|--stripesize StripeSize]]
{-l|--extents LogicalExtentsNumber[%{VG|LV|PVS|FREE}] |
-L|--size LogicalVolumeSize[kKmMgGtTpPeE]}
[-M|--persistent {y|n}] [--major major] [--minor minor]
[-n|--name LogicalVolumeName]
[-p|--permission {r|rw}]
[-r|--readahead ReadAheadSectors|auto|none]
[-t|--test]
[-v|--verbose]
[--version]
看上方的40*40 = 160 M size.
Step5:
下面格式化成 ext3 的格式：
root@aoracle ~]# mkfs.ext3 /dev/myvg1/mylv1
mke2fs 1.39 (29-May-2006)
Filesystem label=
OS type: Linux
Block size=1024 (log=0)
Fragment size=1024 (log=0)
40960 inodes, 163840 blocks
8192 blocks (5.00%) reserved for the super user
First data block=1
Maximum filesystem blocks=67371008
20 block groups
8192 blocks per group, 8192 fragments per group
2048 inodes per group
Superblock backups stored on blocks:
8193, 24577, 40961, 57345, 73729
Writing inode tables: done
Creating journal (4096 blocks): done
Writing superblocks and filesystem accounting information: done
This filesystem will be automatically checked every 24 mounts or
180 days, whichever comes first. Use tune2fs -c or -i to override.
[root@aoracle ~]#
Step6:
创建目录：
mkdir /IBM
mount；
[root@aoracle IBM]# mount /dev/myvg1/mylv1 /IBM
[root@aoracle IBM]# df -k
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/sda1 16246460 10968556 4439312 72% /
tmpfs 265656 0 265656 0% /dev/shm
/dev/sdb 15481840 3070332 11625076 21% /u01
/dev/sdc1 10317828 2659212 7134500 28% /u02
/dev/mapper/myvg1-mylv1
158667 5664 144811 4% /IBM
---------
下面进行 对文件系统的扩充：
1： extend the LV:
root@aoracle /]# lvextend -L +40M /dev/myvg1/mylv1
Extending logical volume mylv1 to 200.00 MB
Logical volume mylv1 successfully resized
[root@aoracle /]# df -k
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/sda1 16246460 4242504 11165364 28% /
tmpfs 265656 0 265656 0% /dev/shm
/dev/sdb 15481840 3070256 11625152 21% /u01
/dev/sdc1 10317828 2659212 7134500 28% /u02
/dev/mapper/myvg1-mylv1
158667 5664 144811 4% /IBM
发现文件系统 并没有变大，
umount 后进行 扩充：
[root@aoracle /]# umount /IBM
[root@aoracle /]# resize2fs /dev/myvg1/mylv1
resize2fs 1.39 (29-May-2006)
Please run 'e2fsck -f /dev/myvg1/mylv1' first.
[root@aoracle /]# e2fsck -f /dev/myvg1/mylv1
e2fsck 1.39 (29-May-2006)
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information
/dev/myvg1/mylv1: 11/40960 files (9.1% non-contiguous), 10837/163840 blocks
[root@aoracle /]# resize2fs /dev/myvg1/mylv1
resize2fs 1.39 (29-May-2006)
Resizing the filesystem on /dev/myvg1/mylv1 to 204800 (1k) blocks.
The filesystem on /dev/myvg1/mylv1 is now 204800 blocks long.
[root@aoracle /]# mount /dev/myvg1/mylv1 /IBM
[root@aoracle /]# df -k
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/sda1 16246460 4242504 11165364 28% /
tmpfs 265656 0 265656 0% /dev/shm
/dev/sdb 15481840 3070256 11625152 21% /u01
/dev/sdc1 10317828 2659212 7134500 28% /u02
/dev/mapper/myvg1-mylv1
198337 5664 182433 4% /IBM
扩充成功。