linux : LV--PV--VG 创建

先看一下文档：

创建PV

[root@z1~]# pvcreate /dev/sdb1

[root@z1~]# pvcreate /dev/sdc1

查看PV [root@z1~]# pvdisplay

创建卷组VG

[root@z1~]# vgcreate myvg1 /dev/sdb1 /dev/sdc1

查看VG

[root@z1~]#vgdisplay

创建逻辑卷LV

[root@z1~]# lvcreate –l 40 –n mylv1 myvg1

查看LV

[root@z1~]# lvdisplay

LV格式化成ext3文件格式

[root@z1~]# mkfs.ext3 /dev/myvg1/mylv1

创建目录 [

root@z1~]# mkdir /mylv1mut

挂载

[root@z1~]# mount /dev/myvg1/mylv1 /mylv1mnt

对挂载的逻辑卷进行扩容

Ls –lh

查看容量

[root@z1~]# lvextend –L +50M /dev/myvg1/mylv1

查看分区使用情况

[root@z1~]# df –h

对mylv1进行在线扩容

[root@z1~]# resize2fs /dev/myvg1/mylv1

对为挂载的逻辑卷进行扩容

[root@z1~]# lvextend –L +70M /dev/myvg1/mylv2

[root@z1~]# mount /dev/myvg1/mylv2 /mylv2mnt

[root@z1~]# umount /mylv2mnt

[root@z1~]# resize2fs /dev/myvg1/mylv2

[root@z1~]# e2fsck –f /dev/myvg1/mylv2 (注意在mount 状态下fsck 会破坏文件系统)

[root@z1~]# resize2fs /dev/myvg1/mylv2

[root@z1~]# mount /dev/myvg1/mylv2 /mylv2mnt/

[root@z1~]# df –h

对VG进行扩容(一)

[root@z1~]# partprobe

[root@z1~]# pvcreate /dev/sdb2

[root@z1~]# vgextend myvg1 /dev/sdb2

对VG进行扩容(二)

[root@z1~]# pvcreate /dev/sdb3

[root@z1~]# pvcreate /dev/sdc2

[root@z1~]# vgcreate /dev/sdb3 /dev/sdc2

[root@z1~]# vgmerge myvg1 myvg2

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下面开始操作：

关于在disk 上见pv,pg 的操作实践：

Step1:

现在 虚拟机关机的情况下增加两块 scsi 盘。

Step2； 建pv:

[root@aoracle ~]# pvcreate /dev/sdd

Physical volume "/dev/sdd" successfully created

[root@aoracle ~]# pvcreate /dev/sde

Physical volume "/dev/sde" successfully created

好，下面查看一下：

[root@aoracle ~]# pvdisplay

/dev/cdrom: open failed: No medium found

"/dev/sdd" is a new physical volume of "2.00 GB"

--- NEW Physical volume ---

PV Name /dev/sdd

VG Name

PV Size 2.00 GB

Allocatable NO

PE Size (KByte) 0

Total PE 0

Free PE 0

Allocated PE 0

PV UUID b3d2fB-QeQQ-05UV-KLAF-2AB4-Gpfw-5kbsOu

"/dev/sde" is a new physical volume of "2.00 GB"

--- NEW Physical volume ---

PV Name /dev/sde

VG Name

PV Size 2.00 GB

Allocatable NO

PE Size (KByte) 0

Total PE 0

Free PE 0

Allocated PE 0

PV UUID r0pBoP-a6rC-CGsb-UEZR-3bXN-fwj3-wsK2GA

Step3: 创建卷组vg: 并且查看：

[root@aoracle ~]# vgcreate myvg1 /dev/sdd /dev/sde

Volume group "myvg1" successfully created

[root@aoracle ~]# vgdisplay

--- Volume group ---

VG Name myvg1

System ID

Format lvm2

Metadata Areas 2

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 2

Act PV 2

VG Size 3.99 GB

PE Size 4.00 MB

Total PE 1022

Alloc PE / Size 0 / 0

Free PE / Size 1022 / 3.99 GB

VG UUID Y4wahX-Q3IW-iagV-S2o0-x0b9-sOzW-AXu1u4

Step4:

创建 逻辑卷：

[root@aoracle ~]# lvcreate -l 40 -n mylv1 myvg1

Logical volume "mylv1" created

[root@aoracle ~]# lvdisplay

--- Logical volume ---

LV Name /dev/myvg1/mylv1

VG Name myvg1

LV UUID k0rYqH-yZFf-BzOl-BtEc-30Z8-Q98S-G2Gz0i

LV Write Access read/write

LV Status available

# open 0

LV Size 160.00 MB

Current LE 40

Segments 1

Allocation inherit

Read ahead sectors auto

- currently set to 256

Block device 253:0

[root@aoracle ~]#

可以lvcreate --help 看到每个参数的意思：

lvcreate -s|--snapshot

[-c|--chunksize]

[-A|--autobackup {y|n}]

[--addtag Tag]

[--alloc AllocationPolicy]

[-C|--contiguous {y|n}]

[-d|--debug]

[-h|-?|--help]

[-i|--stripes Stripes [-I|--stripesize StripeSize]]

{-l|--extents LogicalExtentsNumber[%{VG|LV|PVS|FREE}] |

-L|--size LogicalVolumeSize[kKmMgGtTpPeE]}

[-M|--persistent {y|n}] [--major major] [--minor minor]

[-n|--name LogicalVolumeName]

[-p|--permission {r|rw}]

[-r|--readahead ReadAheadSectors|auto|none]

[-t|--test]

[-v|--verbose]

[--version]

看上方的40*40 = 160 M size.

Step5:

下面格式化成 ext3 的格式：

root@aoracle ~]# mkfs.ext3 /dev/myvg1/mylv1

mke2fs 1.39 (29-May-2006)

Filesystem label=

OS type: Linux

Block size=1024 (log=0)

Fragment size=1024 (log=0)

40960 inodes, 163840 blocks

8192 blocks (5.00%) reserved for the super user

First data block=1

Maximum filesystem blocks=67371008

20 block groups

8192 blocks per group, 8192 fragments per group

2048 inodes per group

Superblock backups stored on blocks:

8193, 24577, 40961, 57345, 73729

Writing inode tables: done

Creating journal (4096 blocks): done

Writing superblocks and filesystem accounting information: done

This filesystem will be automatically checked every 24 mounts or

180 days, whichever comes first. Use tune2fs -c or -i to override.

[root@aoracle ~]#

Step6:

创建目录：

mkdir /IBM

mount；

[root@aoracle IBM]# mount /dev/myvg1/mylv1 /IBM

[root@aoracle IBM]# df -k

Filesystem 1K-blocks Used Available Use% Mounted on

/dev/sda1 16246460 10968556 4439312 72% /

tmpfs 265656 0 265656 0% /dev/shm

/dev/sdb 15481840 3070332 11625076 21% /u01

/dev/sdc1 10317828 2659212 7134500 28% /u02

/dev/mapper/myvg1-mylv1

158667 5664 144811 4% /IBM

---------

下面进行 对文件系统的扩充：

1： extend the LV:

root@aoracle /]# lvextend -L +40M /dev/myvg1/mylv1

Extending logical volume mylv1 to 200.00 MB

Logical volume mylv1 successfully resized

[root@aoracle /]# df -k

Filesystem 1K-blocks Used Available Use% Mounted on

/dev/sda1 16246460 4242504 11165364 28% /

tmpfs 265656 0 265656 0% /dev/shm

/dev/sdb 15481840 3070256 11625152 21% /u01

/dev/sdc1 10317828 2659212 7134500 28% /u02

/dev/mapper/myvg1-mylv1

158667 5664 144811 4% /IBM

发现文件系统 并没有变大，

umount 后进行 扩充：

[root@aoracle /]# umount /IBM

[root@aoracle /]# resize2fs /dev/myvg1/mylv1

resize2fs 1.39 (29-May-2006)

Please run 'e2fsck -f /dev/myvg1/mylv1' first.

[root@aoracle /]# e2fsck -f /dev/myvg1/mylv1

e2fsck 1.39 (29-May-2006)

Pass 1: Checking inodes, blocks, and sizes

Pass 2: Checking directory structure

Pass 3: Checking directory connectivity

Pass 4: Checking reference counts

Pass 5: Checking group summary information

/dev/myvg1/mylv1: 11/40960 files (9.1% non-contiguous), 10837/163840 blocks

[root@aoracle /]# resize2fs /dev/myvg1/mylv1

resize2fs 1.39 (29-May-2006)

Resizing the filesystem on /dev/myvg1/mylv1 to 204800 (1k) blocks.

The filesystem on /dev/myvg1/mylv1 is now 204800 blocks long.

[root@aoracle /]# mount /dev/myvg1/mylv1 /IBM

[root@aoracle /]# df -k

Filesystem 1K-blocks Used Available Use% Mounted on

/dev/sda1 16246460 4242504 11165364 28% /

tmpfs 265656 0 265656 0% /dev/shm

/dev/sdb 15481840 3070256 11625152 21% /u01

/dev/sdc1 10317828 2659212 7134500 28% /u02

/dev/mapper/myvg1-mylv1

198337 5664 182433 4% /IBM

扩充成功。