逻辑卷管理实验----缩减/home目录使用空间并创建新的LVM(初学者学习使用)
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参考：http://blog.51cto.com/dreamfire/1084729
实验环境:redhat6.5
实验过程
显示物理卷：
[[email protected] ~]# pvdisplay
--- Physical volume ---
PV Name /dev/sda2
VG Name vg_clark
PV Size 299.51 GiB / not usable 3.00 MiB
Allocatable yes
PE Size 4.00 MiB
Total PE 76674
Free PE 142
Allocated PE 76532
PV UUID fusHvY-5mpq-X2bO-pbdC-2AWl-m4wO-cUf07p
查看磁盘挂载：
[[email protected] ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg_clark-lv_root 231G 27G 193G 13% /
tmpfs 16G 228K 16G 1% /dev/shm
/dev/sda1 485M 39M 421M 9% /boot
/dev/mapper/vg_clark-lv_home 49G 226M 46G 1% /home
/dev/sr0 3.6G 3.6G 0 100% /media/RHEL_6.5 x86_64 Disc 1
umount home目录：
[[email protected] /]# umount /home
检查lvm：
[[email protected] /]# e2fsck -f /dev/vg_clark/lv_home
e2fsck 1.41.12 (17-May-2010)
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/vg_clark/lv_home: 504/3203072 files (0.0% non-contiguous), 258764/12800000 blocks
resize lvm（注意不要在生产环境使用）：
[[email protected] /]# resize2fs /dev/vg_clark/lv_home 2G
resize2fs 1.41.12 (17-May-2010)
Resizing the filesystem on /dev/vg_clark/lv_home to 524288 (4k) blocks.
The filesystem on /dev/vg_clark/lv_home is now 524288 blocks long.
减少lvm空间：
[[email protected] /]# lvreduce -L 2G /dev/vg_clark/lv_home
WARNING: Reducing active logical volume to 2.00 GiB
THIS MAY DESTROY YOUR DATA (filesystem etc.)
Do you really want to reduce lv_home? [y/n]: y
Reducing logical volume lv_home to 2.00 GiB
Logical volume lv_home successfully resized
重新挂载/home目录
[[email protected] /]# mount /dev/vg_clark/lv_home /home
[[email protected] /]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg_clark-lv_root 231G 27G 193G 13% /
tmpfs 16G 228K 16G 1% /dev/shm
/dev/sda1 485M 39M 421M 9% /boot
/dev/sr0 3.6G 3.6G 0 100% /media/RHEL_6.5 x86_64 Disc 1
/dev/mapper/vg_clark-lv_home 2.0G 198M 1.7G 11% /home
[[email protected] /]# fdisk -l
Disk /dev/sda: 322.1 GB, 322122547200 bytes
255 heads, 63 sectors/track, 39162 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000ba939
Device Boot Start End Blocks Id System
/dev/sda1 * 1 64 512000 83 Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2 64 39163 314059776 8e Linux LVM
Disk /dev/mapper/vg_clark-lv_root: 251.7 GB, 251658240000 bytes
255 heads, 63 sectors/track, 30595 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Disk /dev/mapper/vg_clark-lv_swap: 16.9 GB, 16911433728 bytes
255 heads, 63 sectors/track, 2056 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Disk /dev/mapper/vg_clark-lv_home: 2147 MB, 2147483648 bytes
255 heads, 63 sectors/track, 261 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
空间释放到物理卷中：
[[email protected] /]# pvdisplay
--- Physical volume ---
PV Name /dev/sda2
VG Name vg_clark
PV Size 299.51 GiB / not usable 3.00 MiB
Allocatable yes
PE Size 4.00 MiB
Total PE 76674
Free PE 12130
Allocated PE 64544
PV UUID fusHvY-5mpq-X2bO-pbdC-2AWl-m4wO-cUf07p
查看卷组发现减少的空间已经自动释放到卷组中：
[[email protected] /]# vgdisplay
--- Volume group ---
VG Name vg_clark
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 5
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 3
Open LV 3
Max PV 0
Cur PV 1
Act PV 1
VG Size 299.51 GiB
PE Size 4.00 MiB
Total PE 76674
Alloc PE / Size 64544 / 252.12 GiB
Free PE / Size 12130 / 47.38 GiB
VG UUID 1IW8eG-arlp-kvje-wFLT-pC5d-AcY0-RulpNe
创建名为lv_test的lvm：
[[email protected] /]# lvcreate -L 15G -n lv_test vg_clark
Logical volume "lv_test" created
[[email protected] /]# lvdisplay
--- Logical volume ---
LV Path /dev/vg_clark/lv_root
LV Name lv_root
VG Name vg_clark
LV UUID shkBg6-9RqZ-AhDG-qfVf-d51Z-nsoS-qvF7Da
LV Write Access read/write
LV Creation host, time clark, 2017-02-10 10:33:09 +0800
LV Status available
# open 1
LV Size 234.38 GiB
Current LE 60000
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:0
--- Logical volume ---
LV Path /dev/vg_clark/lv_swap
LV Name lv_swap
VG Name vg_clark
LV UUID FQE8o0-yOKG-S4ip-Cvry-qSdk-v3f9-uPSa1e
LV Write Access read/write
LV Creation host, time clark, 2017-02-10 10:33:50 +0800
LV Status available
# open 1
LV Size 15.75 GiB
Current LE 4032
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:1
--- Logical volume ---
LV Path /dev/vg_clark/lv_home
LV Name lv_home
VG Name vg_clark
LV UUID FTLjIk-zr5B-M5ak-WdXB-c2Zs-c0eC-xZ6YBp
LV Write Access read/write
LV Creation host, time clark, 2017-02-10 10:33:51 +0800
LV Status available
# open 1
LV Size 2.00 GiB
Current LE 512
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:2
--- Logical volume ---
LV Path /dev/vg_clark/lv_test
LV Name lv_test
VG Name vg_clark
LV UUID l1IhX5-LOKf-lOaH-K5nZ-3wod-2X7m-07cogG
LV Write Access read/write
LV Creation host, time clark, 2017-11-28 13:19:39 +0800
LV Status available
# open 0
LV Size 15.00 GiB
Current LE 3840
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:3
[[email protected] /]# lvdisplay
--- Logical volume ---
LV Path /dev/vg_clark/lv_root
LV Name lv_root
VG Name vg_clark
LV UUID shkBg6-9RqZ-AhDG-qfVf-d51Z-nsoS-qvF7Da
LV Write Access read/write
LV Creation host, time clark, 2017-02-10 10:33:09 +0800
LV Status available
# open 1
LV Size 234.38 GiB
Current LE 60000
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:0
--- Logical volume ---
LV Path /dev/vg_clark/lv_swap
LV Name lv_swap
VG Name vg_clark
LV UUID FQE8o0-yOKG-S4ip-Cvry-qSdk-v3f9-uPSa1e
LV Write Access read/write
LV Creation host, time clark, 2017-02-10 10:33:50 +0800
LV Status available
# open 1
LV Size 15.75 GiB
Current LE 4032
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:1
--- Logical volume ---
LV Path /dev/vg_clark/lv_home
LV Name lv_home
VG Name vg_clark
LV UUID FTLjIk-zr5B-M5ak-WdXB-c2Zs-c0eC-xZ6YBp
LV Write Access read/write
LV Creation host, time clark, 2017-02-10 10:33:51 +0800
LV Status available
# open 1
LV Size 2.00 GiB
Current LE 512
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:2
--- Logical volume ---
LV Path /dev/vg_clark/lv_test
LV Name lv_test
VG Name vg_clark
LV UUID l1IhX5-LOKf-lOaH-K5nZ-3wod-2X7m-07cogG
LV Write Access read/write
LV Creation host, time clark, 2017-11-28 13:19:39 +0800
LV Status available
# open 0
LV Size 15.00 GiB
Current LE 3840
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:3
[[email protected] /]# cat /etc/fstab
#
# /etc/fstab
# Created by anaconda on Fri Feb 10 10:35:59 2017
#
# Accessible filesystems, by reference, are maintained under ‘/dev/disk‘
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
/dev/mapper/vg_clark-lv_root / ext4 defaults 1 1
UUID=3b96274e-550d-43fa-96c3-2a4b0b6684dc /boot ext4 defaults 1 2
/dev/mapper/vg_clark-lv_home /home ext4 defaults 1 2
/dev/mapper/vg_clark-lv_swap swap swap defaults 0 0
tmpfs /dev/shm tmpfs defaults 0 0
devpts /dev/pts devpts gid=5,mode=620 0 0
sysfs /sys sysfs defaults 0 0
proc /proc proc defaults 0 0
格式化lvm：
[[email protected] /]# mkfs.ext4 /dev/vg_clark/lv_test
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
983040 inodes, 3932160 blocks
196608 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=4026531840
120 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
Writing inode tables: done
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done
This filesystem will be automatically checked every 23 mounts or
180 days, whichever comes first. Use tune2fs -c or -i to override.
挂载lv_test到/test目录
[[email protected] /]# mkdir /test
[[email protected] /]# mount /dev/vg_clark/lv_test /test
[[email protected] /]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg_clark-lv_root 231G 27G 193G 13% /
tmpfs 16G 228K 16G 1% /dev/shm
/dev/sda1 485M 39M 421M 9% /boot
/dev/sr0 3.6G 3.6G 0 100% /media/RHEL_6.5 x86_64 Disc 1
/dev/mapper/vg_clark-lv_home 2.0G 198M 1.7G 11% /home
/dev/mapper/vg_clark-lv_test 15G 166M 14G 2% /test
接下删除lv_test逻辑卷，并创建名为lv_asm的逻辑卷用作数据库使用：
[[email protected] /]# umount /test
[[email protected] /]#
[[email protected] /]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg_clark-lv_root 231G 27G 193G 13% /
tmpfs 16G 228K 16G 1% /dev/shm
/dev/sda1 485M 39M 421M 9% /boot
/dev/sr0 3.6G 3.6G 0 100% /media/RHEL_6.5 x86_64 Disc 1
/dev/mapper/vg_clark-lv_home 2.0G 198M 1.7G 11% /home
[[email protected] /]# lvdisplay
--- Logical volume ---
LV Path /dev/vg_clark/lv_root
LV Name lv_root
VG Name vg_clark
LV UUID shkBg6-9RqZ-AhDG-qfVf-d51Z-nsoS-qvF7Da
LV Write Access read/write
LV Creation host, time clark, 2017-02-10 10:33:09 +0800
LV Status available
# open 1
LV Size 234.38 GiB
Current LE 60000
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:0
--- Logical volume ---
LV Path /dev/vg_clark/lv_swap
LV Name lv_swap
VG Name vg_clark
LV UUID FQE8o0-yOKG-S4ip-Cvry-qSdk-v3f9-uPSa1e
LV Write Access read/write
LV Creation host, time clark, 2017-02-10 10:33:50 +0800
LV Status available
# open 1
LV Size 15.75 GiB
Current LE 4032
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:1
--- Logical volume ---
LV Path /dev/vg_clark/lv_home
LV Name lv_home
VG Name vg_clark
LV UUID FTLjIk-zr5B-M5ak-WdXB-c2Zs-c0eC-xZ6YBp
LV Write Access read/write
LV Creation host, time clark, 2017-02-10 10:33:51 +0800
LV Status available
# open 1
LV Size 2.00 GiB
Current LE 512
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:2
--- Logical volume ---
LV Path /dev/vg_clark/lv_test
LV Name lv_test
VG Name vg_clark
LV UUID l1IhX5-LOKf-lOaH-K5nZ-3wod-2X7m-07cogG
LV Write Access read/write
LV Creation host, time clark, 2017-11-28 13:19:39 +0800
LV Status available
# open 0
LV Size 15.00 GiB
Current LE 3840
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:3
[[email protected] /]# vgdisplay
--- Volume group ---
VG Name vg_clark
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 6
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 4
Open LV 3
Max PV 0
Cur PV 1
Act PV 1
VG Size 299.51 GiB
PE Size 4.00 MiB
Total PE 76674
Alloc PE / Size 68384 / 267.12 GiB
Free PE / Size 8290 / 32.38 GiB
VG UUID 1IW8eG-arlp-kvje-wFLT-pC5d-AcY0-RulpNe
[[email protected] /]# pvdisplay
--- Physical volume ---
PV Name /dev/sda2
VG Name vg_clark
PV Size 299.51 GiB / not usable 3.00 MiB
Allocatable yes
PE Size 4.00 MiB
Total PE 76674
Free PE 8290
Allocated PE 68384
PV UUID fusHvY-5mpq-X2bO-pbdC-2AWl-m4wO-cUf07p
[[email protected] /]# lvremove /dev/vg_clark/lv_test
Do you really want to remove active logical volume lv_test? [y/n]: y
Logical volume "lv_test" successfully removed
[[email protected] /]#
[[email protected] /]# pvdisplay
--- Physical volume ---
PV Name /dev/sda2
VG Name vg_clark
PV Size 299.51 GiB / not usable 3.00 MiB
Allocatable yes
PE Size 4.00 MiB
Total PE 76674
Free PE 12130
Allocated PE 64544
PV UUID fusHvY-5mpq-X2bO-pbdC-2AWl-m4wO-cUf07p
[[email protected] /]# vgdisplay
--- Volume group ---
VG Name vg_clark
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 7
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 3
Open LV 3
Max PV 0
Cur PV 1
Act PV 1
VG Size 299.51 GiB
PE Size 4.00 MiB
Total PE 76674
Alloc PE / Size 64544 / 252.12 GiB
Free PE / Size 12130 / 47.38 GiB
VG UUID 1IW8eG-arlp-kvje-wFLT-pC5d-AcY0-RulpNe
[[email protected] /]#
[[email protected] /]# lvcreate -L 45G -n lv_asm vg_clark
Logical volume "lv_asm" created
[[email protected] /]# mkfs.ext4 /dev/vg_clark/lv_asm
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
2949120 inodes, 11796480 blocks
589824 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=4294967296
360 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
Writing inode tables: done
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done
This filesystem will be automatically checked every 30 mounts or
180 days, whichever comes first. Use tune2fs -c or -i to override.
[[email protected] /]#
[[email protected] /]#
[[email protected] /]# lvdisplay
--- Logical volume ---
LV Path /dev/vg_clark/lv_root
LV Name lv_root
VG Name vg_clark
LV UUID shkBg6-9RqZ-AhDG-qfVf-d51Z-nsoS-qvF7Da
LV Write Access read/write
LV Creation host, time clark, 2017-02-10 10:33:09 +0800
LV Status available
# open 1
LV Size 234.38 GiB
Current LE 60000
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:0
--- Logical volume ---
LV Path /dev/vg_clark/lv_swap
LV Name lv_swap
VG Name vg_clark
LV UUID FQE8o0-yOKG-S4ip-Cvry-qSdk-v3f9-uPSa1e
LV Write Access read/write
LV Creation host, time clark, 2017-02-10 10:33:50 +0800
LV Status available
# open 1
LV Size 15.75 GiB
Current LE 4032
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:1
--- Logical volume ---
LV Path /dev/vg_clark/lv_home
LV Name lv_home
VG Name vg_clark
LV UUID FTLjIk-zr5B-M5ak-WdXB-c2Zs-c0eC-xZ6YBp
LV Write Access read/write
LV Creation host, time clark, 2017-02-10 10:33:51 +0800
LV Status available
# open 1
LV Size 2.00 GiB
Current LE 512
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:2
--- Logical volume ---
LV Path /dev/vg_clark/lv_asm
LV Name lv_asm
VG Name vg_clark
LV UUID Fa3ufV-6Pjn-Sncv-KyKd-x6BD-GWoi-yFXjMv
LV Write Access read/write
LV Creation host, time clark, 2017-11-28 14:00:39 +0800
LV Status available
# open 0
LV Size 45.00 GiB
Current LE 11520
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:3
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