pv vg lv 组合拳

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fdisk/dev/sde

分区

Command (mfor help): l

查看已知的分区类型

8e Linux LVM

8e为逻辑卷类型

Command (mfor help): p

原分区类型为Linux

Device Boot Start End Blocks Id System

/dev/sde1 1 130 1044193+ 83 Linux

改变分区类型

Command (mfor help): t

Selected partition 1

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

改为Linux LVM类型

Changed system typeof partition 1 to 8e (Linux LVM)

看一下

Command (mfor help): p

Device Boot Start End Blocks Id System

/dev/sde1 1 130 1044193+ 8e Linux LVM

生效一下

partprobe

查看pv

pvscan

创建pv简单吧

pvcreate /dev/sde1

Wiping software RAIDmd superblock on /dev/sde1

Physical volume "/dev/sde1"successfully created

[root@rhel6~]# pvscan

PV /dev/sde1 lvm2 [1019.72 MiB]

Total: 1 [1019.72 MiB] / in use: 0 [0 ] / in no VG: 1 [1019.72 MiB]

[root@rhel6~]# pvdisplay

"/dev/sde1" is a new physicalvolume of "1019.72 MiB"

--- NEW Physical volume ---

PV Name /dev/sde1

VG Name

PV Size 1019.72 MiB

Allocatable NO

PE Size 0

Total PE 0

Free PE 0

Allocated PE 0

PV UUID 3R1C19-ODdM-4QGh-AJsS-6ZrP-nvad-TS7jwN

创建vg8M为pe的大小

[root@rhel6~]# vgcreate -s 8M vbirdvg /dev/sde1

Volume group "vbirdvg" successfullycreated

[root@rhel6~]# vgscan

Reading all physical volumes. This may take a while...

Found volume group "vbirdvg" usingmetadata type lvm2

[root@rhel6~]# vgdisplay

--- Volume group ---

VG Name vbirdvg

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 1016.00 MiB

PE Size 8.00 MiB

Total PE 127

Alloc PE / Size 0 / 0

Free PE / Size 127 / 1016.00 MiB

VG UUID InMgGs-oj1Y-VuMN-ugu9-VpzD-uaTu-Yc33TX

在新创建的pv后，也可以使用vgextend $vgname /dev/sdXN 拓展vg。

创建lv，-l表示的是多少个pe，一个pe=8m，8×20=160m.

[root@rhel6~]# lvcreate -l 20 -n birdlv vbirdvg

Logical volume "birdlv" created

看一下

[root@rhel6~]# lvdisplay

--- Logical volume---

LV Name /dev/vbirdvg/birdlv

VG Name vbirdvg

LV UUID WL5EjU-P5Xm-LVME-9BZF-hjfz-C2ux-FjB4vC

LV Write Access read/write

LV Status available

# open 0

LV Size 160.00 MiB

Current LE 20

Segments 1

Allocation inherit

Read ahead sectors auto

- currently set to 256

Block device 253:0

[root@rhel6~]# mkfs -t ext4 /dev/vbirdvg/birdlv

创建挂载目录

[root@rhel6~]# mkdir /lv_birdlv

挂载

[root@rhel6~]# mount /dev/vbirdvg/birdlv /lv_birdlv

查看文件系统信息

[root@rhel6~]# df -h

Filesystem Size Used Avail Use% Mounted on

/dev/sda1 9.9G 6.5G 3.0G 69% /

tmpfs 1012M 88K 1012M 1% /dev/shm

/dev/sda3 7.9G 6.8G 744M 91% /u01

/dev/sdb1 9.9G 5.8G 3.7G 62% /u01/arch1

/dev/sdb2 9.9G 1.9G 7.6G 20% /u01/backup

/dev/md0 3.0G 115M 2.7G 5% /d_raid5

/dev/mapper/vbirdvg-birdlv

155M 5.6M 142M 4% /lv_birdlv

使用lvresize增加lv的大小 -l +20表示再添加20个pe，也就是160m。

[root@rhel6~]# lvresize -l +20 /dev/vbirdvg/birdlv

lv的大小已经增加了

[root@rhel6~]# lvdisplay

--- Logical volume ---

LV Name /dev/vbirdvg/birdlv

VG Name vbirdvg

LV UUID WL5EjU-P5Xm-LVME-9BZF-hjfz-C2ux-FjB4vC

LV Write Access read/write

LV Status available

# open 1

LV Size 320.00 MiB

Current LE 40

Segments 1

Allocation inherit

Read ahead sectors auto

- currently set to 256

Block device 253:0

但是文件系统的大小却没变

[root@rhel6~]# df -h

Filesystem Size Used Avail Use% Mounted on

/dev/sda1 9.9G 6.5G 3.0G 69% /

tmpfs 1012M 88K 1012M 1% /dev/shm

/dev/sda3 7.9G 6.8G 744M 91% /u01

/dev/sdb1 9.9G 5.8G 3.7G 62% /u01/arch1

/dev/sdb2 9.9G 1.9G 7.6G 20% /u01/backup

/dev/md0 3.0G 115M 2.7G 5% /d_raid5

/dev/mapper/vbirdvg-birdlv

155M 5.6M 142M 4% /lv_birdlv

查看原系统的superblock

[root@rhel6~]# dumpe2fs /dev/vbirdvg/birdlv

完整的将lv的容量扩充到文件系统中

resize2fs /dev/vbirdvg/birdlv

这不是OK了。

[root@rhel6~]# df -h

Filesystem Size Used Avail Use% Mounted on

/dev/sda1 9.9G 6.5G 3.0G 69% /

tmpfs 1012M 88K 1012M 1% /dev/shm

/dev/sda3 7.9G 6.8G 744M 91% /u01

/dev/sdb1 9.9G 5.8G 3.7G 62% /u01/arch1

/dev/sdb2 9.9G 1.9G 7.6G 20% /u01/backup

/dev/md0 3.0G 115M 2.7G 5% /d_raid5

/dev/mapper/vbirdvg-birdlv

310M 6.1M 288M 3% /lv_birdlv