linux新建立LVM磁盘卷流程说明

[root@RAC1 ~]# fdisk -l

Disk /dev/sda: 85.9 GB, 85899345920 bytes

255 heads, 63 sectors/track, 10443 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: 0x000c9810

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 10444 83373056 8e Linux LVM ----sdba已经有逻辑编号了

Disk /dev/sdb: 17.2 GB, 17179869184 bytes ----可以看出sdb还未分配逻辑编号

255 heads, 63 sectors/track, 2088 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_rac1-lv_root: 53.7 GB, 53687091200 bytes

255 heads, 63 sectors/track, 6527 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_rac1-lv_swap: 4227 MB, 4227858432 bytes

255 heads, 63 sectors/track, 514 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_rac1-lv_home: 27.5 GB, 27455913984 bytes

255 heads, 63 sectors/track, 3337 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

[root@RAC1 ~]# fdisk /dev/sdb ---对sdb磁盘进行逻辑分区

Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel

Building a new DOS disklabel with disk identifier 0x726b3678.

Changes will remain in memory only, until you decide to write them.

After that, of course, the previous content won't be recoverable.

Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)

WARNING: DOS-compatible mode is deprecated. It's strongly recommended to

switch off the mode (command 'c') and change display units to

sectors (command 'u').

Command (m for help): n

Command action

e extended

p primary partition (1-4)

p

Partition number (1-4): 1

First cylinder (1-2088, default 1):

Using default value 1

Last cylinder, +cylinders or +size{K,M,G} (1-2088, default 2088):

Using default value 2088

Command (m for help): t

Selected partition 1

Hex code (type L to list codes): 8e

Changed system type of partition 1 to 8e (Linux LVM)

Command (m for help): w

The partition table has been altered!

Clling ioctl() to re-read partition table.

Syncing disks.

[root@RAC1 ~]# mkfs -t ext4 -c /dev/sdb1 ----将sdb1格式化ext4磁盘格式

mke2fs 1.41.12 (17-May-2010)

文件系统标签=

操作系统:Linux

块大小=4096 (log=2)

分块大小=4096 (log=2)

Stride=0 blocks, Stripe width=0 blocks

1048576 inodes, 4192957 blocks

209647 blocks (5.00%) reserved for the super user

第一个数据块=0

Maximum filesystem blocks=4294967296

128 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

Checking for bad blocks (read-only test): 完成

正在写入inode表: 完成

Creating journal (32768 blocks): 完成

Writing superblocks and filesystem accounting information: 完成

This filesystem will be automatically checked every 26 mounts or

180 days, whichever comes first. Use tune2fs -c or -i to override.

[root@RAC1 ~]# pvdisplay ----查询PV逻辑块

--- Physical volume ---

PV Name /dev/sda2

VG Name vg_rac1

PV Size 79.51 GiB / not usable 3.00 MiB

Allocatable yes (but full)

PE Size 4.00 MiB

Total PE 20354

Free PE 0

Allocated PE 20354

PV UUID YpRRUv-QZFd-OCUm-Qpe6-CbOc-qJ6j-sj6nMP

[root@RAC1 ~]# pvcreate /dev/sdb1 ----将sdb1创建位PV逻辑快

Physical volume "/dev/sdb1" successfully created

[root@RAC1 ~]# pvdisplay

--- Physical volume ---

PV Name /dev/sda2

VG Name vg_rac1

PV Size 79.51 GiB / not usable 3.00 MiB

Allocatable yes (but full)

PE Size 4.00 MiB

Total PE 20354

Free PE 0

Allocated PE 20354

PV UUID YpRRUv-QZFd-OCUm-Qpe6-CbOc-qJ6j-sj6nMP

"/dev/sdb1" is a new physical volume of "15.99 GiB"

--- NEW Physical volume ---

PV Name /dev/sdb1

VG Name

PV Size 15.99 GiB

Allocatable NO

PE Size 0

Total PE 0

Free PE 0

Allocated PE 0

PV UUID TRZ31M-3pVV-1uhx-Wz5L-zF0O-fz3D-tH5tjg

[root@RAC1 ~]#

[root@RAC1 ~]# vgcreate data_vg /dev/sdb1 ----创建vg磁盘组名字为data_vg

Volume group "data_vg" successfully created

[root@RAC1 ~]# vgdisplay

--- Volume group ---

VG Name data_vg

System ID

Format lvm2

Metadata Areas 1

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 1

Act PV 1

VG Size 15.99 GiB

PE Size 4.00 MiB

Total PE 4094

Alloc PE / Size 0 / 0

Free PE / Size 4094 / 15.99 GiB

VG UUID cBX1rU-PrU4-dJAy-Pqi2-pX6e-tlHo-19HSwZ

--- Volume group ---

VG Name vg_rac1

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 3

Max PV 0

Cur PV 1

Act PV 1

VG Size 79.51 GiB

PE Size 4.00 MiB

Total PE 20354

Alloc PE / Size 20354 / 79.51 GiB

Free PE / Size 0 / 0

VG UUID 3STo0z-xIfp-rHDO-O4tp-BTW2-B4Qj-uJkvNm

[root@RAC1 ~]# pvdisplay -----查看pv逻辑块信息

--- Physical volume ---

PV Name /dev/sdb1

VG Name data_vg

PV Size 15.99 GiB / not usable 2.74 MiB

Allocatable yes

PE Size 4.00 MiB

Total PE 4094

Free PE 4094

Allocated PE 0

PV UUID TRZ31M-3pVV-1uhx-Wz5L-zF0O-fz3D-tH5tjg

--- Physical volume ---

PV Name /dev/sda2

VG Name vg_rac1

PV Size 79.51 GiB / not usable 3.00 MiB

Allocatable yes (but full)

PE Size 4.00 MiB

Total PE 20354

Free PE 0

Allocated PE 20354

PV UUID YpRRUv-QZFd-OCUm-Qpe6-CbOc-qJ6j-sj6nMP

[root@RAC1 ~]#

[root@RAC1 ~]#

[root@RAC1 ~]# vgextend data_vg /dev/sdb1 -----将sdb1的PV磁盘块添加到vg磁盘组

Physical volume '/dev/sdb1' is already in volume group 'data_vg'

Unable to add physical volume '/dev/sdb1' to volume group 'data_vg'.

[root@RAC1 ~]# vgdisplay ---查看已有的vg磁盘组

--- Volume group ---

VG Name data_vg

System ID

Format lvm2

Metadata Areas 1

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 1

Act PV 1

VG Size 15.99 GiB

PE Size 4.00 MiB

Total PE 4094

Alloc PE / Size 0 / 0

Free PE / Size 4094 / 15.99 GiB

VG UUID cBX1rU-PrU4-dJAy-Pqi2-pX6e-tlHo-19HSwZ

--- Volume group ---

VG Name vg_rac1

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 3

Max PV 0

Cur PV 1

Act PV 1

VG Size 79.51 GiB

PE Size 4.00 MiB

Total PE 20354

Alloc PE / Size 20354 / 79.51 GiB

Free PE / Size 0 / 0

VG UUID 3STo0z-xIfp-rHDO-O4tp-BTW2-B4Qj-uJkvNm

[root@RAC1 ~]#

[root@RAC1 ~]# lvdisplay

--- Logical volume ---

LV Path /dev/vg_rac1/lv_root

LV Name lv_root

VG Name vg_rac1

LV UUID 6UVdUJ-x7fB-6C40-KhKb-zluq-1Zjc-OAl12C

LV Write Access read/write

LV Creation host, time RAC1, 2017-02-07 09:09:50 +0800

LV Status available

# open 1

LV Size 50.00 GiB

Current LE 12800

Segments 1

Allocation inherit

Read ahead sectors auto

- currently set to 256

Block device 253:0

--- Logical volume ---

LV Path /dev/vg_rac1/lv_home

LV Name lv_home

VG Name vg_rac1

LV UUID uABSyv-iebN-DMNy-XVfe-IfYR-DjwY-a9en2z

LV Write Access read/write

LV Creation host, time RAC1, 2017-02-07 09:09:54 +0800

LV Status available

# open 1

LV Size 25.57 GiB

Current LE 6546

Segments 1

Allocation inherit

Read ahead sectors auto

- currently set to 256

Block device 253:2

--- Logical volume ---

LV Path /dev/vg_rac1/lv_swap

LV Name lv_swap

VG Name vg_rac1

LV UUID tgC9L1-ZFcp-e1kz-rclV-vlkV-ui9l-NjGroT

LV Write Access read/write

LV Creation host, time RAC1, 2017-02-07 09:09:56 +0800

LV Status available

# open 1

LV Size 3.94 GiB

Current LE 1008

Segments 1

Allocation inherit

Read ahead sectors auto

- currently set to 256

Block device 253:1

[root@RAC1 ~]# lvcreate -n share -L 10G data_vg -----从vg磁盘组划出空间

Logical volume "share" created

[root@RAC1 ~]# lvdisplay ----查看已有的lv分区

--- Logical volume ---

LV Path /dev/data_vg/share

LV Name share

VG Name data_vg

LV UUID ovum77-AgIo-8pFt-p8xp-E9XV-VTW3-9IjPfT

LV Write Access read/write

LV Creation host, time RAC1, 2017-02-20 14:53:28 +0800

LV Status available

# open 0

LV Size 10.00 GiB

Current LE 2560

Segments 1

Allocation inherit

Read ahead sectors auto

- currently set to 256

Block device 253:3

--- Logical volume ---

LV Path /dev/vg_rac1/lv_root

LV Name lv_root

VG Name vg_rac1

LV UUID 6UVdUJ-x7fB-6C40-KhKb-zluq-1Zjc-OAl12C

LV Write Access read/write

LV Creation host, time RAC1, 2017-02-07 09:09:50 +0800

LV Status available

# open 1

LV Size 50.00 GiB

Current LE 12800

Segments 1

Allocation inherit

Read ahead sectors auto

- currently set to 256

Block device 253:0

--- Logical volume ---

LV Path /dev/vg_rac1/lv_home

LV Name lv_home

VG Name vg_rac1

LV UUID uABSyv-iebN-DMNy-XVfe-IfYR-DjwY-a9en2z

LV Write Access read/write

LV Creation host, time RAC1, 2017-02-07 09:09:54 +0800

LV Status available

# open 1

LV Size 25.57 GiB

Current LE 6546

Segments 1

Allocation inherit

Read ahead sectors auto

- currently set to 256

Block device 253:2

--- Logical volume ---

LV Path /dev/vg_rac1/lv_swap

LV Name lv_swap

VG Name vg_rac1

LV UUID tgC9L1-ZFcp-e1kz-rclV-vlkV-ui9l-NjGroT

LV Write Access read/write

LV Creation host, time RAC1, 2017-02-07 09:09:56 +0800

LV Status available

# open 1

LV Size 3.94 GiB

Current LE 1008

Segments 1

Allocation inherit

Read ahead sectors auto

- currently set to 256

Block device 253:1

[root@RAC1 ~]#

[root@RAC1 ~]# lvs -----查看lv逻辑分区信息

LV VG Attr LSize Pool Origin Data% Move Log Cpy%Sync Convert

share data_vg -wi-a----- 10.00g

lv_home vg_rac1 -wi-ao---- 25.57g

lv_root vg_rac1 -wi-ao---- 50.00g

lv_swap vg_rac1 -wi-ao---- 3.94g

[root@RAC1 ~]# pvs -------查看pv逻辑块信息

PV VG Fmt Attr PSize PFree

/dev/sda2 vg_rac1 lvm2 a-- 79.51g 0

/dev/sdb1 data_vg lvm2 a-- 15.99g 5.99g

[root@RAC1 ~]# vgs ----查看vg磁盘组信息

VG #PV #LV #SN Attr VSize VFree

data_vg 1 1 0 wz--n- 15.99g 5.99g

vg_rac1 1 3 0 wz--n- 79.51g 0

[root@RAC1 ~]#

[root@RAC1 /]# mkfs.ext4 /dev/data_vg/share -----将磁盘格式化为系统所支持的文件类型

mke2fs 1.41.12 (17-May-2010)

文件系统标签=

操作系统:Linux

块大小=4096 (log=2)

分块大小=4096 (log=2)

Stride=0 blocks, Stripe width=0 blocks

655360 inodes, 2621440 blocks

131072 blocks (5.00%) reserved for the super user

第一个数据块=0

Maximum filesystem blocks=2684354560

80 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

正在写入inode表: 完成

Creating journal (32768 blocks): 完成

Writing superblocks and filesystem accounting information: 完成

This filesystem will be automatically checked every 32 mounts or

180 days, whichever comes first. Use tune2fs -c or -i to override.

[root@RAC1 /]# mount /dev/data_vg/share /bbsoft/ -----挂载到新的目录

[root@RAC1 /]# df -lh

Filesystem Size Used Avail Use% Mounted on

/dev/mapper/vg_rac1-lv_root 50G 4.7G 43G 11% /

tmpfs 1.9G 80K 1.9G 1% /dev/shm

/dev/sda1 485M 39M 421M 9% /boot

/dev/mapper/vg_rac1-lv_home 26G 5.0G 19G 21% /home

/dev/mapper/data_vg-share 9.9G 151M 9.2G 2% /bbsoft

[root@RAC1 /]#

[root@RAC1 ~]# vim /etc/fstab ----新增的磁盘空间，要将其修改为系统启动时自动挂载。

#

# /etc/fstab

# Created by anaconda on Tue Feb 7 09:10:36 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_rac1-lv_root / ext4 defaults 1 1

UUID=cf8b8b95-229f-4817-b4c4-0c78b5af93fd /boot ext4 defaults 1 2

/dev/mapper/vg_rac1-lv_home /home ext4 defaults 1 2

/dev/mapper/vg_rac1-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

/dev/mapper/data_vg-share /bbsoft ext4 defaults 0 0

磁盘所在位置 挂载的目录 磁盘格式

~

~

"/etc/fstab" 20L, 926C 已写入

[root@RAC1 ~]# reboot -f

[root@RAC1 ~]# blkid -o value -s UUID /dev/sdb1 -----查看sdb1 的UUID多少

TRZ31M-3pVV-1uhx-Wz5L-zF0O-fz3D-tH5tjg

[root@RAC1 ~]#