lvm硬盘管理及LVM扩容

迈不过友情╰ 2021-11-23 05:52 351阅读 0赞

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

转载于:https://www.cnblogs.com/liuxia912/p/10962374.html

lvm硬盘管理及LVM扩容

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