LVM逻辑卷管理---用来扩展分区内存

[root@lvm ~]#

[root@lvm ~]# pvcreate /dev/sd[de]

Physical volume "/dev/sdd" successfully created

Physical volume "/dev/sde" successfully created

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[root@lvm ~]# pvcreate /dev/sdf 创建pv

Physical volume "/dev/sdf" successfully created

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[root@lvm ~]# pvdisplay /dev/sde 显示下pv的详细信息

"/dev/sde" is a new physical volume of "20.00 GB"

--- NEW Physical volume ---

PV Name /dev/sde

VG Name

PV Size 20.00 GB

Allocatable NO

PE Size (KByte) 0

Total PE 0

Free PE 0

Allocated PE 0

PV UUID R4WGy1-ui4I-gsrB-EkFu-grfi-w4hN-VCkj3n

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[root@lvm ~]# pvscan 扫描下pv

PV /dev/sdd lvm2 [12.00 GB]

PV /dev/sde lvm2 [20.00 GB]

PV /dev/sdf lvm2 [20.00 GB]

Total: 3 [52.00 GB] / in use: 0 [0 ] / in no VG: 3 [52.00 GB]

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vgcreate photo /dev/sd[def] 创建vg

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[root@lvm ~]# vgscan 扫描vg

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

Found volume group "photo" using metadata type lvm2

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[root@lvm ~]# vgdisplay 显示vg的信息

--- Volume group ---

VG Name photo

System ID

Format lvm2

Metadata Areas 3

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 3

Act PV 3

VG Size 51.99 GB

PE Size 4.00 MB

Total PE 13309

Alloc PE / Size 0 / 0

Free PE / Size 13309 / 51.99 GB

VG UUID PLphxo-OP8v-ZSwy-Lw6C-0tqD-EvsJ-RdJ2FZ

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[root@lvm ~]# pvscan

PV /dev/sdd VG photo lvm2 [12.00 GB / 12.00 GB free]

PV /dev/sde VG photo lvm2 [20.00 GB / 20.00 GB free]

PV /dev/sdf VG photo lvm2 [20.00 GB / 20.00 GB free]

Total: 3 [51.99 GB] / in use: 3 [51.99 GB] / in no VG: 0 [0 ]

可以查询哪个pv属于哪个vg

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[root@lvm ~]# lvcreate -L 20G -n 7yue5 photo

/dev/cdrom: open failed: 只读文件系统

Logical volume "7yue5" created

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-L 指定大小

-n 指定lv的名字

7yue5 是lv的名字

photo是vg的名字

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[root@lvm ~]# lvcreate -L 25G -n 9yue5 photo

/dev/cdrom: open failed: 只读文件系统

Logical volume "9yue5" created

[root@lvm ~]# lvscan

ACTIVE '/dev/photo/7yue5' [20.00 GB] inherit

ACTIVE '/dev/photo/9yue5' [25.00 GB] inherit

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[root@lvm ~]# mkfs.ext3 /dev/photo/7yue5

[root@lvm ~]# mkfs.ext3 /dev/photo/9yue5

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修改/etc/fstab文件

添加

/dev/photo/7yue5 /7yue5 ext3 defaults 0 0

/dev/photo/9yue5 /9yue5 ext3 defaults 0 0

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实现开机自动挂载

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[root@lvm ~]# mkdir /7yue5

[root@lvm ~]# mkdir /9yue5

新建挂载点

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mount -a

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扩容vg

1.[root@lvm ~]# pvcreate /dev/sdg

Physical volume "/dev/sdg" successfully created

[root@lvm ~]# pvcreate /dev/sdh

Physical volume "/dev/sdh" successfully created

2.[root@lvm ~]# vgextend photo /dev/sd[gh]

/dev/cdrom: open failed: 只读文件系统

/dev/cdrom: open failed: 只读文件系统

Attempt to close device '/dev/cdrom' which is not open.

Volume group "photo" successfully extended

给photo 这个vg扩容，增加了2个pv进来

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扩容lv

1.[root@lvm 7yue5]# lvextend -L +20G /dev/photo/7yue5

扩容20G

/dev/cdrom: open failed: 只读文件系统

Extending logical volume 7yue5 to 40.00 GB

2.[root@lvm 7yue5]# resize2fs /dev/photo/7yue5 重新识别文件系统的大小

resize2fs 1.39 (29-May-2006)

Filesystem at /dev/photo/7yue5 is mounted on /7yue5; on-line resizing required

Performing an on-line resize of /dev/photo/7yue5 to 10485760 (4k) blocks.

The filesystem on /dev/photo/7yue5 is now 10485760 blocks long.

3.df -Th 查看是否生效

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