创建LVM卷和快照
一、查看磁盘情况并创建逻辑卷
[root@fengzhao001 ~]# fdisk /dev/sda
The number of cylinders for this disk is set to 60801.
There is nothing wrong with that, but this is larger than 1024,
and could in certain setups cause problems with:
1) software that runs at boot time (e.g., old versions of LILO)
2) booting and partitioning software from other OSs
(e.g., DOS FDISK, OS/2 FDISK)
Command (m for help): p
Disk /dev/sda: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 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 6387 51199155 8e Linux LVM
/dev/sda3 6388 12761 51199155 8e Linux LVM
/dev/sda4 12762 60801 385881300 5 Extended
1、删除扩展分区
Command (m for help): d
Partition number (1-5): 4
Command (m for help): p
Disk /dev/sda: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 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 6387 51199155 8e Linux LVM
/dev/sda3 6388 12761 51199155 8e Linux LVM
Command (m for help): p
Disk /dev/sda: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 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 6387 51199155 8e Linux LVM
/dev/sda3 6388 12761 51199155 8e Linux LVM
Command (m for help):
2、创建扩展分区
Command (m for help): n
Command action
e extended
p primary partition (1-4)
4
Invalid partition number for type `4'
Command action
e extended
p primary partition (1-4)
e
Selected partition 4
First cylinder (12762-60801, default 12762):
Using default value 12762
Last cylinder or +size or +sizeM or +sizeK (12762-60801, default 60801):
Using default value 60801
3、创建逻辑分区
Command (m for help): n
First cylinder (12762-60801, default 12762):
Using default value 12762
Last cylinder or +size or +sizeM or +sizeK (12762-60801, default 60801): +100M
Command (m for help): n
First cylinder (12775-60801, default 12775):
Using default value 12775
Last cylinder or +size or +sizeM or +sizeK (12775-60801, default 60801): +100M
Command (m for help): n
First cylinder (12788-60801, default 12788):
Using default value 12788
Last cylinder or +size or +sizeM or +sizeK (12788-60801, default 60801): +100M
Command (m for help): n
First cylinder (12801-60801, default 12801):
Using default value 12801
Last cylinder or +size or +sizeM or +sizeK (12801-60801, default 60801): +100M
4、查看创建情况
Command (m for help): p
Disk /dev/sda: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 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 6387 51199155 8e Linux LVM
/dev/sda3 6388 12761 51199155 8e Linux LVM
/dev/sda4 12762 60801 385881300 5 Extended
/dev/sda5 12762 12774 104391 83 Linux
/dev/sda6 12775 12787 104391 83 Linux
/dev/sda7 12788 12800 104391 83 Linux
/dev/sda8 12801 12813 104391 83 Linux
Command (m for help):
5、修改分区标记
Command (m for help): t
Partition number (1-8): 5
Hex code (type L to list codes): 8e
Changed system type of partition 5 to 8e (Linux LVM)
Command (m for help): t
Partition number (1-8): 6
Hex code (type L to list codes): 8e
Changed system type of partition 6 to 8e (Linux LVM)
Command (m for help): t
Partition number (1-8): 7
Hex code (type L to list codes): 8e
Changed system type of partition 7 to 8e (Linux LVM)
Command (m for help): t
Partition number (1-8): 8
Hex code (type L to list codes): 8e
Changed system type of partition 8 to 8e (Linux LVM)
Command (m for help): p
Disk /dev/sda: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 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 6387 51199155 8e Linux LVM
/dev/sda3 6388 12761 51199155 8e Linux LVM
/dev/sda4 12762 60801 385881300 5 Extended
/dev/sda5 12762 12774 104391 8e Linux LVM
/dev/sda6 12775 12787 104391 8e Linux LVM
/dev/sda7 12788 12800 104391 8e Linux LVM
/dev/sda8 12801 12813 104391 8e Linux LVM
6、保存并退出
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.
Syncing disks.
[root@fengzhao001 ~]#
二、查看分区状况
[root@fengzhao001 ~]# fdisk -l
Disk /dev/sda: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 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 6387 51199155 8e Linux LVM
/dev/sda3 6388 12761 51199155 8e Linux LVM
/dev/sda4 12762 60801 385881300 5 Extended
/dev/sda5 12762 12774 104391 8e Linux LVM
/dev/sda6 12775 12787 104391 8e Linux LVM
/dev/sda7 12788 12800 104391 8e Linux LVM
/dev/sda8 12801 12813 104391 8e Linux LVM
[root@fengzhao001 ~]#
三、创建物理卷
1、扫描物理卷并创建
[root@fengzhao001 ~]# pvscan
PV /dev/sda3 VG Vol0 lvm2 [48.82 GB / 0 free]
PV /dev/sda2 VG virt lvm2 [48.82 GB / 1.95 GB free]
Total: 2 [97.65 GB] / in use: 2 [97.65 GB] / in no VG: 0 [0 ]
[root@fengzhao001 ~]# pvcreate /dev/sda{5,6,7,8}
Device /dev/sda5 not found (or ignored by filtering).
Device /dev/sda6 not found (or ignored by filtering).
Device /dev/sda7 not found (or ignored by filtering).
Device /dev/sda8 not found (or ignored by filtering).
2、磁盘未找到，需同步
[root@fengzhao001 ~]# partprobe
[root@fengzhao001 ~]# pvcreate /dev/sda{5,6,7,8}
Writing physical volume data to disk "/dev/sda5"
Physical volume "/dev/sda5" successfully created
Writing physical volume data to disk "/dev/sda6"
Physical volume "/dev/sda6" successfully created
Writing physical volume data to disk "/dev/sda7"
Physical volume "/dev/sda7" successfully created
Writing physical volume data to disk "/dev/sda8"
Physical volume "/dev/sda8" successfully created
[root@fengzhao001 ~]#
3、磁盘创建成功
[root@fengzhao001 ~]# pvscan
PV /dev/sda3 VG Vol0 lvm2 [48.82 GB / 0 free]
PV /dev/sda2 VG virt lvm2 [48.82 GB / 1.95 GB free]
PV /dev/sda5 lvm2 [101.94 MB]
PV /dev/sda6 lvm2 [101.94 MB]
PV /dev/sda7 lvm2 [101.94 MB]
PV /dev/sda8 lvm2 [101.94 MB]
Total: 6 [98.05 GB] / in use: 2 [97.65 GB] / in no VG: 4 [407.78 MB]
[root@fengzhao001 ~]#
四、创建卷组
1、扫描卷组情况
[root@fengzhao001 ~]# vgscan
Reading all physical volumes. This may take a while...
Found volume group "Vol0" using metadata type lvm2
Found volume group "virt" using metadata type lvm2
2、创建卷组并查看情况
[root@fengzhao001 ~]# vgcreate vg1 /dev/sda{5,6}
Volume group "vg1" successfully created
[root@fengzhao001 ~]# vgdisplay
--- Volume group ---
VG Name vg1
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 200.00 MB
PE Size 4.00 MB
Total PE 50
Alloc PE / Size 0 / 0
Free PE / Size 50 / 200.00 MB
VG UUID d5kLtl-1f9k-crTG-xFjZ-UlGE-fTVm-XXjeG0
--- Volume group ---
VG Name Vol0
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 2
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 1
Open LV 1
Max PV 0
Cur PV 1
Act PV 1
VG Size 48.82 GB
PE Size 4.00 MB
Total PE 12499
Alloc PE / Size 12499 / 48.82 GB
Free PE / Size 0 / 0
VG UUID uyZVp6-V4Yd-tOWe-7lAe-dPho-h4v3-2GZxBU
--- Volume group ---
VG Name virt
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 4
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 3
Open LV 2
Max PV 0
Cur PV 1
Act PV 1
VG Size 48.82 GB
PE Size 4.00 MB
Total PE 12499
Alloc PE / Size 12000 / 46.88 GB
Free PE / Size 499 / 1.95 GB
VG UUID 91Txq2-ZK0n-R6oT-0Tvh-HlTu-p1Bs-2A8ZOP
[root@fengzhao001 ~]#
五、建立逻辑卷
[root@fengzhao001 ~]# lvscan
ACTIVE '/dev/Vol0/vol_root' [48.82 GB] inherit
ACTIVE '/dev/virt/station' [19.53 GB] inherit
ACTIVE '/dev/virt/windows' [7.81 GB] inherit
ACTIVE '/dev/virt/server' [19.53 GB] inherit
[root@fengzhao001 ~]#
[root@fengzhao001 ~]# lvcreate -L +200M -n lv1 vg1
Logical volume "lv1" created
[root@fengzhao001 ~]#
[root@fengzhao001 ~]# lvscan
ACTIVE '/dev/vg1/lv1' [200.00 MB] inherit
ACTIVE '/dev/Vol0/vol_root' [48.82 GB] inherit
ACTIVE '/dev/virt/station' [19.53 GB] inherit
ACTIVE '/dev/virt/windows' [7.81 GB] inherit
ACTIVE '/dev/virt/server' [19.53 GB] inherit
[root@fengzhao001 ~]# lvdisplay |grep lv1
LV Name /dev/vg1/lv1
[root@fengzhao001 ~]#
查看逻辑卷状况
[root@fengzhao001 ~]# lvdisplay /dev/vg1/lv1
--- Logical volume ---
LV Name /dev/vg1/lv1
VG Name vg1
LV UUID RMmdmX-vJR2-ho6f-Otu9-RqGa-Mvef-e8F6aG
LV Write Access read/write
LV Status available
# open 0
LV Size 200.00 MB
Current LE 50
Segments 2
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:4
[root@fengzhao001 ~]#
六、格式化并挂载逻辑卷
1、格式化逻辑卷
[root@fengzhao001 ~]# mkfs.ext3 /dev/vg1/lv1
mke2fs 1.39 (29-May-2006)
Filesystem label=
OS type: Linux
Block size=1024 (log=0)
Fragment size=1024 (log=0)
51200 inodes, 204800 blocks
10240 blocks (5.00%) reserved for the super user
First data block=1
Maximum filesystem blocks=67371008
25 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 35 mounts or
180 days, whichever comes first. Use tune2fs -c or -i to override.
[root@fengzhao001 ~]#
2、挂载逻辑卷
[root@fengzhao001 ~]# mkdir /shiyanlvm
[root@fengzhao001 ~]# mount /dev/vg1/lv1 /shiyanlvm/
[root@fengzhao001 ~]# mount
/dev/mapper/Vol0-vol_root on / type ext3 (rw)
proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw)
devpts on /dev/pts type devpts (rw,gid=5,mode=620)
/dev/sda1 on /boot type ext3 (rw)
tmpfs on /dev/shm type tmpfs (rw)
none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw)
/dev/mapper/vg1-lv1 on /shiyanlvm type ext3 (rw)
[root@fengzhao001 ~]#
七、调整LVM卷大小
1、扩大卷组
[root@fengzhao001 ~]# vgextend vg1 /dev/sda{7,8}
Volume group "vg1" successfully extended
[root@fengzhao001 ~]# vgscan
Reading all physical volumes. This may take a while...
Found volume group "vg1" using metadata type lvm2
Found volume group "Vol0" using metadata type lvm2
Found volume group "virt" using metadata type lvm2
[root@fengzhao001 ~]# vgdisplay
--- Volume group ---
VG Name vg1
System ID
Format lvm2
Metadata Areas 4
Metadata Sequence No 3
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 1
Open LV 1
Max PV 0
Cur PV 4
Act PV 4
VG Size 400.00 MB
PE Size 4.00 MB
Total PE 100
Alloc PE / Size 50 / 200.00 MB
Free PE / Size 50 / 200.00 MB
VG UUID d5kLtl-1f9k-crTG-xFjZ-UlGE-fTVm-XXjeG0
2、扩大逻辑卷
[root@fengzhao001 ~]# lvextend -L +200M /dev/vg1/lv1
Extending logical volume lv1 to 400.00 MB
Logical volume lv1 successfully resized
3、对比之前的结果
[root@fengzhao001 ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/Vol0-vol_root
48G 4.4G 41G 10% /
/dev/sda1 99M 13M 81M 14% /boot
tmpfs 3.8G 0 3.8G 0% /dev/shm
/dev/mapper/vg1-lv1 194M 5.6M 179M 4% /shiyanlvm
4、同步
[root@fengzhao001 ~]# resize2fs /dev/vg1/lv1
resize2fs 1.39 (29-May-2006)
Filesystem at /dev/vg1/lv1 is mounted on /shiyanlvm; on-line resizing required
Performing an on-line resize of /dev/vg1/lv1 to 409600 (1k) blocks.
The filesystem on /dev/vg1/lv1 is now 409600 blocks long.
5、对比之后的结果
[root@fengzhao001 ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/Vol0-vol_root
48G 4.4G 41G 10% /
/dev/sda1 99M 13M 81M 14% /boot
tmpfs 3.8G 0 3.8G 0% /dev/shm
/dev/mapper/vg1-lv1 388M 6.3M 362M 2% /shiyanlvm
[root@fengzhao001 ~]#
6、减小逻辑卷
（1）卸载逻辑卷
[root@fengzhao001 ~]# umount /shiyanlvm
[root@fengzhao001 ~]# mount
/dev/mapper/Vol0-vol_root on / type ext3 (rw)
proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw)
devpts on /dev/pts type devpts (rw,gid=5,mode=620)
/dev/sda1 on /boot type ext3 (rw)
tmpfs on /dev/shm type tmpfs (rw)
none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw)
（2）先减小文件系统大小
[root@fengzhao001 ~]# resize2fs /dev/vg1/lv1 200M
resize2fs 1.39 (29-May-2006)
Please run 'e2fsck -f /dev/vg1/lv1' first.
[root@fengzhao001 ~]# e2fsck -f /dev/vg1/lv1
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/vg1/lv1: 11/98784 files (9.1% non-contiguous), 18639/401408 blocks
[root@fengzhao001 ~]#
[root@fengzhao001 ~]# resize2fs /dev/vg1/lv1 200M
resize2fs 1.39 (29-May-2006)
Resizing the filesystem on /dev/vg1/lv1 to 204800 (1k) blocks.
The filesystem on /dev/vg1/lv1 is now 204800 blocks long.
（3）查看文件系统大小
[root@fengzhao001 ~]# mkdir /shiyan
[root@fengzhao001 ~]# mount /dev/vg1/lv1 /shiyan
[root@fengzhao001 ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/Vol0-vol_root
48G 4.4G 41G 10% /
/dev/sda1 99M 13M 81M 14% /boot
tmpfs 3.8G 0 3.8G 0% /dev/shm
/dev/mapper/vg1-lv1 194M 5.6M 179M 4% /shiyan
（4）此时LVM大小（400M）
[root@fengzhao001 ~]# lvs
LV VG Attr LSize Origin Snap% Move Log Copy% Convert
vol_root Vol0 -wi-ao 48.82G
lv1 vg1 -wi-a- 412.00M
server virt -wi-ao 19.53G
station virt -wi-ao 19.53G
windows virt -wi-a- 7.81G
[root@fengzhao001 ~]#
（5）再减小逻辑卷大小［逻辑卷大小必须大于或等于文件系统大小］
[root@fengzhao001 ~]# lvreduce -L 205M /dev/vg1/lv1
Rounding up size to full physical extent 208.00 MB
WARNING: Reducing active logical volume to 208.00 MB
THIS MAY DESTROY YOUR DATA (filesystem etc.)
Do you really want to reduce lv1? [y/n]: y
Reducing logical volume lv1 to 208.00 MB
Logical volume lv1 successfully resized
[root@fengzhao001 ~]# lvdisplay
--- Logical volume ---
LV Name /dev/vg1/lv1
VG Name vg1
LV UUID RMmdmX-vJR2-ho6f-Otu9-RqGa-Mvef-e8F6aG
LV Write Access read/write
LV Status available
# open 0
LV Size 208.00 MB
Current LE 52
Segments 3
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:2
八、减小卷组大小
[root@fengzhao001 ~]# vgreduce vg1 /dev/sda{8,9}
Removed "/dev/sda8" from volume group "vg1"
Removed "/dev/sda9" from volume group "vg1"
[root@fengzhao001 ~]# vgdisplay
--- Volume group ---
VG Name vg1
System ID
Format lvm2
Metadata Areas 3
Metadata Sequence No 23
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 1
Open LV 0
Max PV 0
Cur PV 3
Act PV 3
VG Size 300.00 MB
PE Size 4.00 MB
Total PE 75
Alloc PE / Size 52 / 208.00 MB
Free PE / Size 23 / 92.00 MB
VG UUID d5kLtl-1f9k-crTG-xFjZ-UlGE-fTVm-XXjeG0
九、创建快照
1、新加磁盘（250M）
[root@fengzhao001 ~]# fdisk /dev/sda
The number of cylinders for this disk is set to 60801.
There is nothing wrong with that, but this is larger than 1024,
and could in certain setups cause problems with:
1) software that runs at boot time (e.g., old versions of LILO)
2) booting and partitioning software from other OSs
(e.g., DOS FDISK, OS/2 FDISK)
Command (m for help): p
Disk /dev/sda: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 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 6387 51199155 8e Linux LVM
/dev/sda3 6388 12761 51199155 8e Linux LVM
/dev/sda4 12762 60801 385881300 5 Extended
/dev/sda5 12762 12774 104391 8e Linux LVM
/dev/sda6 12775 12787 104391 8e Linux LVM
/dev/sda7 12788 12800 104391 8e Linux LVM
/dev/sda8 12801 12813 104391 8e Linux LVM
Command (m for help): d
Partition number (1-8): 8
Command (m for help): p
Disk /dev/sda: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 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 6387 51199155 8e Linux LVM
/dev/sda3 6388 12761 51199155 8e Linux LVM
/dev/sda4 12762 60801 385881300 5 Extended
/dev/sda5 12762 12774 104391 8e Linux LVM
/dev/sda6 12775 12787 104391 8e Linux LVM
/dev/sda7 12788 12800 104391 8e Linux LVM
Command (m for help): n
First cylinder (12801-60801, default 12801):
Using default value 12801
Last cylinder or +size or +sizeM or +sizeK (12801-60801, default 60801): +250M
Command (m for help): t
Partition number (1-8): 8
Hex code (type L to list codes): 8e
Changed system type of partition 8 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.
Syncing disks.
同步
[root@fengzhao001 ~]# partprobe
新建物理卷
[root@fengzhao001 ~]# pvcreate /dev/sda8
Writing physical volume data to disk "/dev/sda8"
Physical volume "/dev/sda8" successfully created
[root@fengzhao001 ~]#
扩展卷组
[root@fengzhao001 ~]# vgextend vg1 /dev/sda8
Volume group "vg1" successfully extended
[root@fengzhao001 ~]# vgdisplay
--- Volume group ---
VG Name vg1
System ID
Format lvm2
Metadata Areas 4
Metadata Sequence No 11
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 1
Open LV 1
Max PV 0
Cur PV 4
Act PV 4
VG Size 540.00 MB
PE Size 4.00 MB
Total PE 135
Alloc PE / Size 53 / 212.00 MB
Free PE / Size 82 / 328.00 MB
VG UUID d5kLtl-1f9k-crTG-xFjZ-UlGE-fTVm-XXjeG0
[root@fengzhao001 ~]#
2、创建快照
[root@fengzhao001 ~]# lvcreate -L 250M -s -n kuaizhaoss /dev/vg1/lv1
Rounding up size to full physical extent 252.00 MB
Logical volume "kuaizhaoss" created
查看
[root@fengzhao001 ~]# lvscan
ACTIVE Original '/dev/vg1/lv1' [212.00 MB] inherit
ACTIVE Snapshot '/dev/vg1/kuaizhaoss' [252.00 MB] inherit
ACTIVE '/dev/Vol0/vol_root' [48.82 GB] inherit
ACTIVE '/dev/virt/station' [19.53 GB] inherit
ACTIVE '/dev/virt/windows' [7.81 GB] inherit
ACTIVE '/dev/virt/server' [19.53 GB] inherit
[root@fengzhao001 ~]#
3、挂载快照
[root@fengzhao001 ~]# mkdir /kuaizhao
[root@fengzhao001 ~]# mount /dev/vg1/kuaizhaoss /kuaizhao/
[root@fengzhao001 ~]#
4、是否成功挂载
[root@fengzhao001 ~]# mount
/dev/mapper/Vol0-vol_root on / type ext3 (rw)
proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw)
devpts on /dev/pts type devpts (rw,gid=5,mode=620)
/dev/sda1 on /boot type ext3 (rw)
tmpfs on /dev/shm type tmpfs (rw)
none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw)
/dev/mapper/vg1-lv1 on /shiyanlvm type ext3 (rw)
/dev/mapper/vg1-kuaizhaoss on /kuaizhao type ext3 (rw)
[root@fengzhao001 ~]#
5、对比文件系统与快照
（1）在原逻辑卷中添加内容
[root@fengzhao001 ~]# dd if=/dev/zero of=/shiyanlvm/file1 bs=1M count=100
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 1.06717 seconds, 98.3 MB/s
（2）查看文件系统大小
[root@fengzhao001 ~]# ls -lh /shiyanlvm/file1
-rw-r--r-- 1 root root 100M Feb 27 03:48 /shiyanlvm/file1
（3）查看快照
[root@fengzhao001 ~]# ls -lh /kuaizhao
total 12K
drwx------ 2 root root 12K Feb 27 03:41 lost+found
（4）在快照中输入内容
[root@fengzhao001 ~]# dd if=/dev/zero of=/kuaizhao/file2 bs=1M count=100
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 1.00667 seconds, 104 MB/s
（5）查看快照
[root@fengzhao001 ~]# ls -lh /kuaizhao
total 101M
-rw-r--r-- 1 root root 100M Feb 27 03:49 file2
drwx------ 2 root root 12K Feb 27 03:41 lost+found
（6）查看文件系统
[root@fengzhao001 ~]# ls -lh /shiyanlvm
total 101M
-rw-r--r-- 1 root root 100M Feb 27 03:48 file1
drwx------ 2 root root 12K Feb 27 03:41 lost+found
（7）在快照原文件输入50M内容
[root@fengzhao001 ~]# dd if=/dev/zero of=/kuaizhao/file2 bs=1M count=50
50+0 records in
50+0 records out
52428800 bytes (52 MB) copied, 0.882904 seconds, 59.4 MB/s
[root@fengzhao001 ~]# ls -lh /shiyanlvm
total 101M
-rw-r--r-- 1 root root 100M Feb 27 03:48 file1
drwx------ 2 root root 12K Feb 27 03:41 lost+found
（8）查看原文件变化
[root@fengzhao001 ~]# ls -lh /kuaizhao
total 51M
-rw-r--r-- 1 root root 50M Feb 27 03:50 file2
drwx------ 2 root root 12K Feb 27 03:41 lost+found
（9）在快照中输入另一个文件（100M）
[root@fengzhao001 ~]# dd if=/dev/zero of=/kuaizhao/file3 bs=1M count=50
50+0 records in
50+0 records out
52428800 bytes (52 MB) copied, 0.480316 seconds, 109 MB/s
（10）对比文件系统和快照
[root@fengzhao001 ~]# ls -lh /kuaizhao
total 101M
-rw-r--r-- 1 root root 50M Feb 27 03:50 file2
-rw-r--r-- 1 root root 50M Feb 27 03:51 file3
drwx------ 2 root root 12K Feb 27 03:41 lost+found
[root@fengzhao001 ~]# ls -lh /shiyanlvm
total 101M
-rw-r--r-- 1 root root 100M Feb 27 03:48 file1
drwx------ 2 root root 12K Feb 27 03:41 lost+found
[root@fengzhao001 ~]#
