lvm硬盘管理及LVM扩容

1，创建分区

[root@host-10-158-172-44 ~]# fdisk /dev/vda

Welcome to fdisk (util-linux 2.23.2).

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

Be careful before using the write command.

Command (m for help): n

Partition type:

p primary (2 primary, 0 extended, 2 free)

e extended

Select (default p): Enter

Partition number (3,4, default 3): Enter

First sector (41943040-83886079, default 41943040): Enter

Using default value 41943040

Last sector, +sectors or +size{K,M,G} (41943040-83886079, default 83886079):

Using default value 83886079

Partition 3 of type Linux and of size 20 GiB is set

Command (m for help): t

Partition number (1-3, default 3): Enter

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

Changed type of partition 'Linux' to '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 or after you run partprobe(8) or kpartx(8)

Syncing disks.

[root@host-10-158-172-44 ~]# fdisk -l

Disk /dev/vda: 42.9 GB, 42949672960 bytes, 83886080 sectors

Units = sectors of 1 * 512 = 512 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk label type: dos

Disk identifier: 0x0009b56e

Device Boot Start End Blocks Id System

/dev/vda1 * 2048 1026047 512000 83 Linux

/dev/vda2 1026048 41943039 20458496 8e Linux LVM

/dev/vda3 41943040 83886079 20971520 8e Linux LVM

Disk /dev/mapper/centos-root: 18.8 GB, 18756927488 bytes, 36634624 sectors

Units = sectors of 1 * 512 = 512 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk /dev/mapper/centos-swap: 2147 MB, 2147483648 bytes, 4194304 sectors

Units = sectors of 1 * 512 = 512 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

2，创建PV

[root@host-10-158-172-44 ~]# partprobe #使分区表生效，无需重启

[root@host-10-158-172-44 ~]# pvcreate /dev/vda3 #使用pvcreate转换

WARNING: dos signature detected on /dev/vda3 at offset 510. Wipe it? [y/n]: y

Wiping dos signature on /dev/vda3.

Physical volume "/dev/vda3" successfully created

[root@host-10-158-172-44 ~]# pvdisplay #查看已经存在的pv

--- Physical volume ---

PV Name /dev/vda2

VG Name centos

PV Size 19.51 GiB / not usable 3.00 MiB

Allocatable yes

PE Size 4.00 MiB

Total PE 4994

Free PE 10

Allocated PE 4984

PV UUID 2MR7wz-fh1t-6nlO-glse-MEBz-8Rjo-Y7gkhI

"/dev/vda3" is a new physical volume of "20.00 GiB"

--- NEW Physical volume ---

PV Name /dev/vda3

VG Name

PV Size 20.00 GiB

Allocatable NO

PE Size 0

Total PE 0

Free PE 0

Allocated PE 0

PV UUID dvb6J8-YszL-KP8x-LDHc-RGwT-pB3u-s19Pe9

3，扩展VG

[root@host-10-158-172-44 ~]# vgextend centos /dev/vda3

Volume group "centos" successfully extended

[root@host-10-158-172-44 ~]# vgdisplay #查看已经存在的vg

--- Volume group ---

VG Name centos

System ID

Format lvm2

Metadata Areas 2

Metadata Sequence No 4

VG Access read/write

VG Status resizable

MAX LV 0

Cur LV 2

Open LV 2

Max PV 0

Cur PV 2

Act PV 2

VG Size 39.50 GiB

PE Size 4.00 MiB

Total PE 10113

Alloc PE / Size 4984 / 19.47 GiB

Free PE / Size 5129 / 20.04 GiB

VG UUID h5CW2E-aYjt-AZLN-CTMe-7lZp-e2xk-yuDnLs

4，扩展LV

[root@host-10-158-172-44 ~]# lvdisplay #查看已经存在的lv

--- Logical volume ---

LV Path /dev/centos/swap

LV Name swap

VG Name centos

LV UUID U0ANhF-afAc-pb0U-AYmN-EJH0-Wyj8-H2bvws

LV Write Access read/write

LV Creation host, time localhost, 2015-12-01 21:35:58 +0800

LV Status available

# open 2

LV Size 2.00 GiB

Current LE 512

Segments 1

Allocation inherit

Read ahead sectors auto

- currently set to 8192

Block device 253:1

--- Logical volume ---

LV Path /dev/centos/root

LV Name root

VG Name centos

LV UUID sG5AuB-SsYW-ggN5-tl6l-csEg-14F7-6NNVnO

LV Write Access read/write

LV Creation host, time localhost, 2015-12-01 21:35:59 +0800

LV Status available

# open 1

LV Size 17.47 GiB

Current LE 4472

Segments 1

Allocation inherit

Read ahead sectors auto

- currently set to 8192

Block device 253:0

[root@host-10-158-172-44 ~]# lvextend -L 37G /dev/centos/root #扩展lv

Size of logical volume centos/root changed from 20.00 GiB (5120 extents) to 37.00 GiB (9472 extents).

Logical volume root successfully resized

注：lvextend -r -l +100%FREE /dev/centos/root #可使用此命令将所有的vg全部分配

5，执行重设大小

[root@host-10-158-172-44 ~]# xfs_growfs /dev/mapper/centos-root #重设大小

meta-data=/dev/mapper/centos-root isize=256 agcount=5, agsize=1144832 blks

= sectsz=512 attr=2, projid32bit=1

= crc=0 finobt=0

data = bsize=4096 blocks=5242880, imaxpct=25

= sunit=0 swidth=0 blks

naming =version 2 bsize=4096 ascii-ci=0 ftype=0

log =internal bsize=4096 blocks=2560, version=2

= sectsz=512 sunit=0 blks, lazy-count=1

realtime =none extsz=4096 blocks=0, rtextents=0

data blocks changed from 5242880 to 9699328

[root@host-10-158-172-44 ~]# df -h #查看

Filesystem Size Used Avail Use% Mounted on

/dev/mapper/centos-root 37G 789M 37G 3% /

devtmpfs 1.9G 0 1.9G 0% /dev

tmpfs 1.9G 0 1.9G 0% /dev/shm

tmpfs 1.9G 8.4M 1.9G 1% /run

tmpfs 1.9G 0 1.9G 0% /sys/fs/cgroup

/dev/vda1 497M 120M 378M 25% /boot