逻辑卷管理器LVM简介

步鄹2.检查有无在系统上，然后将/dev/sdb1-/dev/sdb3新建成为pv格式

[root@localhost ~]# pvcreate /dev/sd{b1,b2,b3,b4}

Physical volume "/dev/sdb1" successfully created

Physical volume "/dev/sdb2" successfully created

Physical volume "/dev/sdb3" successfully created

Physical volume "/dev/sdb4" successfully created

[root@localhost ~]# pvscan

PV /dev/sdb1                      lvm2 [964.81 MB]

PV /dev/sdb2                      lvm2 [964.84 MB]

PV /dev/sdb3                      lvm2 [964.84 MB]

PV /dev/sdb4                      lvm2 [964.84 MB]

Total: 4 [3.77 GB] / in use: 0 [0   ] / in no VG: 4 [3.77 GB]

VG 阶段

1．将/dev/sdb1-3新建成为一个VG ，且指定PE为16M

[root@localhost ~]# vgcreate -s 16M dgvg /dev/sdb{1,2,3}

Volume group "dgvg" successfully created

[root@localhost ~]# pvscan

PV /dev/sdb1   VG dgvg       lvm2 [960.00 MB / 960.00 MB free]

PV /dev/sdb2   VG dgvg      lvm2 [960.00 MB / 960.00 MB free]

PV /dev/sdb3   VG dgvg       lvm2 [960.00 MB / 960.00 MB free]

PV /dev/sdb4                 lvm2 [964.84 MB]

Total: 4 [3.75 GB] / in use: 3 [2.81 GB] / in no VG: 1 [964.84 MB]

有3个PV被用掉。剩下/dev/sdb4 没被用

2.将剩下的PV(/dev/sdb4)增加到VG里。增加VG的容量。

[root@localhost ~]# vgextend dgvg /dev/sdb4

Volume group "dgvg" successfully extended

[root@localhost ~]# vgdisplay

--- Volume group ---

VG Name               dgvg

System ID            

Format                lvm2

Metadata Areas        4

Metadata Sequence No 2

VG Access             read/write

VG Status             resizable

MAX LV                0

Cur LV                0

Open LV               0

Max PV                0

Cur PV                4

Act PV                4

VG Size               3.75 GB

 PE Size               16.00 MB

 Total PE              240

Alloc PE / Size       0 / 0  

Free PE / Size       240 / 3.75 GB

VG UUID               fK6jkG-T3vG-UkPw-40BT-gprd-dT97-lFL262

LV阶段

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