/dev/sdb 就是我新添加的磁盘了,一 创建逻辑卷

2019-10-22 16:52 来源:未知

逻辑卷管理LVM

LVM 逻辑卷管理,lvm逻辑卷

简介:

LVM ( Logical Volume Manager ) 逻辑卷管理

一、创建 LV

1、首先在你的虚拟机上添加一块新的硬盘用来做实验。

2、安装 lvm : yum -y install lvm2

3、查看新添加的磁盘

shell > fdisk -l

Disk /dev/sdb: 21.5 GB, 21474836480 bytes
255 heads, 63 sectors/track, 2610 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

## 其中,/dev/sdb 就是我新添加的磁盘了

4、创建物理分区

shell > fdisk /dev/sdb
Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel with disk identifier 0x62beb6a4.
Changes will remain in memory only, until you decide to write them.
After that, of course, the previous content won't be recoverable.

Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)

WARNING: DOS-compatible mode is deprecated. It's strongly recommended to
switch off the mode (command 'c') and change display units to
sectors (command 'u').

Command (m for help): m                          # 帮助信息
Command action
        a toggle a bootable flag
        b edit bsd disklabel
        c toggle the dos compatibility flag
        d delete a partition                     # 删除一个分区
        l list known partition types             # 打印分区类型对应的 ID 号
        m print this menu
        n add a new partition                    # 添加一个分区
        o create a new empty DOS partition table
        p print the partition table              # 打印分区表
        q quit without saving changes            # 不保存退出
        s create a new empty Sun disklabel
        t change a partition's system id         # 更改分区 ID
        u change display/entry units
        v verify the partition table
        w write table to disk and exit           # 保存退出
        x extra functionality (experts only)

## 执行的命令是 fdisk /dev/sdb .

Command (m for help): n                          # 执行添加分区指令
Command action
e extended
p primary partition (1-4)
p                                                # 添加一个主分区
Partition number (1-4): 1                        # 分区号为 1
First cylinder (1-2610, default 1):              # 分区起始位置(直接回车)
Using default value 1
Last cylinder, +cylinders or +size{K,M,G} (1-2610, default 2610): +1024M   # 分区结束位置(+1024M 表示 1G 大小)

Command (m for help): n
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 2
First cylinder (133-2610, default 133):
Using default value 133
Last cylinder, +cylinders or +size{K,M,G} (133-2610, default 2610): +1024M

Command (m for help): p                          # 执行打印分区表

Disk /dev/sdb: 21.5 GB, 21474836480 bytes
255 heads, 63 sectors/track, 2610 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x62beb6a4

Device Boot Start End Blocks Id System
/dev/sdb1 1 132 1060258+ 83 Linux
/dev/sdb2 133 264 1060290 83 Linux

## 可以看到分了两个区 /dev/sdb1 /dev/sdb2

Command (m for help): t                          # 执行更改分区 ID (83 表示Linux 普通分区、82 表示swap、8e 表示LVM)
Partition number (1-4): 1
Hex code (type L to list codes): 8e
Changed system type of partition 1 to 8e (Linux LVM)

Command (m for help): t
Partition number (1-4): 2
Hex code (type L to list codes): 8e
Changed system type of partition 2 to 8e (Linux LVM)

Command (m for help): p

Disk /dev/sdb: 21.5 GB, 21474836480 bytes
255 heads, 63 sectors/track, 2610 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x62beb6a4

Device Boot Start End Blocks Id System
/dev/sdb1 1 132 1060258+ 8e Linux LVM
/dev/sdb2 133 264 1060290 8e Linux LVM

## 已经看到分区 ID 变为 8e ; 文件系统为 Linux LVM

Command (m for help): w                          # 执行保存退出
The partition table has been altered!

Calling ioctl() to re-read partition table.
Syncing disks.

shell > fdisk -l /dev/sdb

Disk /dev/sdb: 21.5 GB, 21474836480 bytes
255 heads, 63 sectors/track, 2610 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x62beb6a4

Device Boot Start End Blocks Id System
/dev/sdb1 1 132 1060258+ 8e Linux LVM
/dev/sdb2 133 264 1060290 8e Linux LVM

## 可以看到磁盘 /dev/sdb 有两个分区 /dev/sdb1 /dev/sdb2

5、创建 PV (物理卷)

shell > pvcreate /dev/sdb1 /dev/sdb2
  Physical volume "/dev/sdb1" successfully created
  Physical volume "/dev/sdb2" successfully created

## 使用 pvcreate 创建 PV 后面跟想要创建的分区

shell > pvscan
  PV /dev/sda3 VG vg_study lvm2 [18.80 GiB / 0 free]
  PV /dev/sdb1 lvm2 [1.01 GiB]
  PV /dev/sdb2 lvm2 [1.01 GiB]
  Total: 3 [20.82 GiB] / in use: 1 [18.80 GiB] / in no VG: 2 [2.02 GiB]

## 使用 pvscan 、pvdisplay 、pvs 都可以查看 PV
## PV /dev/sdb1 pv /dev/sdb2 为我新创建的 PV 大小为 1G(PV /dev/sda3 为之前创建的属 VG vg_study )

6、创建 VG (卷组)

shell > vgcreate my_vg /dev/sdb1 /dev/sdb2
  Volume group "my_vg" successfully created

## 使用 vgcreate 创建卷组,后面接 vg 名,接 pv

shell > vgdisplay
  --- Volume group ---
  VG Name my_vg
  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 2.02 GiB
  PE Size 4.00 MiB
  Total PE 516
  Alloc PE / Size 0 / 0
  Free PE / Size 516 / 2.02 GiB
  VG UUID ynCJG8-ZIvI-9gBF-dO5K-aQws-N9WW-r26hch

## 同样可以使用 vgscan 、vgs 、vgdisplay 来查看 VG
## 可以看到 VG名为 my_vg 、VG 大小为 2G 、PE 大小 4M 等

7、创建 LV (逻辑卷)

shell > lvcreate -L 2G -n my_lv my_vg
  Logical volume "my_lv" created

## 使用 lvcreate 创建 LV ,-L 指定 LV大小,-n 指定 LV名称,后面接 VG名

shell > lvdisplay
  --- Logical volume ---
  LV Path /dev/my_vg/my_lv
  LV Name my_lv
  VG Name my_vg
  LV UUID j9Bduh-3TB9-Owhz-X3PX-fVeQ-bvJe-OAFBVp
  LV Write Access read/write
  LV Creation host, time study.localhost.localdomain, 2014-11-26 11:14:28 +0800
  LV Status available
  # open 0
  LV Size 2.00 GiB
  Current LE 512
  Segments 2
  Allocation inherit
  Read ahead sectors auto
  - currently set to 256
  Block device 253:1

## 同样可以使用 lvscan 、lvs 、lvdisplay 来查看 LV
## 可以看到 LV路径 /dev/my_vg/my_lv 、LV名 my_lv 、VG名 my_vg 、LV大小 2G 等

8、创建文件系统 (格式化)

shell > mkfs.ext4 /dev/my_vg/my_lv
mke2fs 1.41.12 (17-May-2010)
文件系统标签=
操作系统:Linux
块大小=4096 (log=2)
分块大小=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
131072 inodes, 524288 blocks
26214 blocks (5.00%) reserved for the super user
第一个数据块=0
Maximum filesystem blocks=536870912
16 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912

正在写入inode表: 完成
Creating journal (16384 blocks): 完成
Writing superblocks and filesystem accounting information: 完成

This filesystem will be automatically checked every 32 mounts or
180 days, whichever comes first. Use tune2fs -c or -i to override.

## 使用 mkfs.ext4 格式化为 ext4 文件系统

9、挂载使用

shell > mkdir /data
shell > mount /dev/my_vg/my_lv /data/
shell > df -HT
Filesystem Type Size Used Avail Use% Mounted on
/dev/mapper/vg_study-LogVol00 ext4 20G 1.4G 18G 8% /
tmpfs tmpfs 521M 0 521M 0% /dev/shm
/dev/sda1 ext4 204M 30M 164M 16% /boot
/dev/mapper/my_vg-my_lv ext4 2.2G 71M 2.0G 4% /data

## 创建 /data 目录,将 /dev/my_vg/my_lv 挂载到 /data

shell > umount /data/
shell > blkid /dev/my_vg/my_lv
/dev/my_vg/my_lv: UUID="a8cb322e-1872-4ea8-bfba-f21b678bc849" TYPE="ext4"
shell > echo "UUID="a8cb322e-1872-4ea8-bfba-f21b678bc849" /data ext4 defaults 0 0" >> /etc/fstab
shell > mount -a
shell > df -HT
Filesystem Type Size Used Avail Use% Mounted on
/dev/mapper/vg_study-LogVol00 ext4 20G 1.5G 18G 8% /
tmpfs tmpfs 521M 0 521M 0% /dev/shm
/dev/sda1 ext4 204M 30M 164M 16% /boot
/dev/mapper/my_vg-my_lv ext4 2.2G 71M 2.0G 4% /data

## 也可以使用 blkid 生成 UUID 然后写入到 /etc/fstab 文件中,实现开机自动挂载

二、扩容 LV

1、首先创建物理分区(重点是这次创建后要格式化)

2、创建 PV

3、扩容 VG

shell > vgextend my_vg /dev/sdb3
  Volume group "my_vg" successfully extended

## 使用 vgextend 指令扩展 VG ,后面接要扩展的 VG名 ,后面接将哪个 PV 扩展进去

shell > vgdisplay my_vg
  --- Volume group ---
  VG Name my_vg
  System ID
  Format lvm2
  Metadata Areas 3
  Metadata Sequence No 3
  VG Access read/write
  VG Status resizable
  MAX LV 0
  Cur LV 1
  Open LV 1
  Max PV 0
  Cur PV 3
  Act PV 3
  VG Size 3.02 GiB
  PE Size 4.00 MiB
  Total PE 774
  Alloc PE / Size 512 / 2.00 GiB
  Free PE / Size 262 / 1.02 GiB
  VG UUID ynCJG8-ZIvI-9gBF-dO5K-aQws-N9WW-r26hch

## 可以使用 vgdisplay my_vg 来指定查看哪个 VG
## 可以看到 VG 总大小为 3G 、已使用 2G 、空闲 1G(因为我们扩进去 1G 的 PV)

4、扩容 LV

shell > lvextend -L +1G /dev/my_vg/my_lv
  Size of logical volume my_vg/my_lv changed from 2.00 GiB (512 extents) to 3.00 GiB (768 extents).
  Logical volume my_lv successfully resized

## 使用 lvextend 扩容 LV ,-L 指定扩多大 ,后面接 LV 实际路径 /dev/my_vg/my_lv

shell > lvdisplay /dev/my_vg/my_lv
  --- Logical volume ---
  LV Path /dev/my_vg/my_lv
  LV Name my_lv
  VG Name my_vg
  LV UUID j9Bduh-3TB9-Owhz-X3PX-fVeQ-bvJe-OAFBVp
  LV Write Access read/write
  LV Creation host, time study.localhost.localdomain, 2014-11-26 11:14:28 +0800
  LV Status available
  # open 1
  LV Size 3.00 GiB
  Current LE 768
  Segments 3
  Allocation inherit
  Read ahead sectors auto
  - currently set to 256
  Block device 253:1

## 可以使用 lvdisplay /dev/my_vg/my_lv 来查看 LV 大小
## LV 大小变为了 3G (原 2G)

5、投入使用

shell > df -HT
Filesystem Type Size Used Avail Use% Mounted on
/dev/mapper/vg_study-LogVol00 ext4 20G 1.4G 18G 8% /
tmpfs tmpfs 521M 0 521M 0% /dev/shm
/dev/sda1 ext4 204M 30M 164M 16% /boot
/dev/mapper/my_vg-my_lv ext4 2.2G 71M 2.0G 4% /data

## 我们发现分区 /data 大小还是 2G

shell > resize2fs /dev/my_vg/my_lv
resize2fs 1.41.12 (17-May-2010)
Filesystem at /dev/my_vg/my_lv is mounted on /data; on-line resizing required
old desc_blocks = 1, new_desc_blocks = 1
Performing an on-line resize of /dev/my_vg/my_lv to 786432 (4k) blocks.
The filesystem on /dev/my_vg/my_lv is now 786432 blocks long.

shell > df -HT
Filesystem Type Size Used Avail Use% Mounted on
/dev/mapper/vg_study-LogVol00 ext4 20G 1.4G 18G 8% /
tmpfs tmpfs 521M 0 521M 0% /dev/shm
/dev/sda1 ext4 204M 30M 164M 16% /boot
/dev/mapper/my_vg-my_lv ext4 3.2G 71M 3.0G 3% /data

## 使用 resize2fs /dev/my_vg/my_lv 重新计算分区大小后 发现扩容到了 3G

三、缩减 LV

1、模拟数据写入

shell > dd if=/dev/zero of=/data/block.db bs=1024M count=1
记录了1+0 的读入
记录了1+0 的写出
1073741824字节(1.1 GB)已复制,81.6381 秒,13.2 MB/秒

## 我们使用 dd 命令写了 1G 的数据到 /data

shell > cp /etc/passwd /data/ ## 复制这个文件的目的是验证数据是否丢失

shell > df -HT
Filesystem Type Size Used Avail Use% Mounted on
/dev/mapper/vg_study-LogVol00 ext4 20G 1.4G 18G 8% /
tmpfs tmpfs 521M 0 521M 0% /dev/shm
/dev/sda1 ext4 204M 30M 164M 16% /boot
/dev/mapper/my_vg-my_lv ext4 3.2G 1.2G 1.9G 39% /data

## 现在这个剩余空间 我们想把他撤出来 1G

2、首先检查一下文件系统

shell > umount /data/ ## 一定要先 umount
shell > e2fsck -f /dev/my_vg/my_lv
e2fsck 1.41.12 (17-May-2010)
第一步: 检查inode,块,和大小
第二步: 检查目录结构
第3步: 检查目录连接性
Pass 4: Checking reference counts
第5步: 检查簇概要信息
/dev/my_vg/my_lv: 13/196608 files (0.0% non-contiguous), 291646/786432 blocks

3、重新计算大小

shell > resize2fs /dev/my_vg/my_lv 2G
resize2fs 1.41.12 (17-May-2010)
Resizing the filesystem on /dev/my_vg/my_lv to 524288 (4k) blocks.
The filesystem on /dev/my_vg/my_lv is now 524288 blocks long.

## 重新定义大小为 2G

4、缩小 LV

shell > lvreduce -L -1G /dev/my_vg/my_lv
  WARNING: Reducing active logical volume to 2.00 GiB
  THIS MAY DESTROY YOUR DATA (filesystem etc.)
  Do you really want to reduce my_lv? [y/n]: y
  Size of logical volume my_vg/my_lv changed from 3.00 GiB (768 extents) to 2.00 GiB (512 extents).
  Logical volume my_lv successfully resized

## 使用 lvreduce 来缩小 LV ,-L -1G 缩小 1G

shell > mount -a
shell > df -HT
Filesystem Type Size Used Avail Use% Mounted on
/dev/mapper/vg_study-LogVol00 ext4 20G 1.4G 18G 8% /
tmpfs tmpfs 521M 0 521M 0% /dev/shm
/dev/sda1 ext4 204M 30M 164M 16% /boot
/dev/mapper/my_vg-my_lv ext4 2.2G 1.2G 863M 58% /data

shell > ls /data/
block.db lost+found passwd

## 重新挂载分区,发现数据没有问题 (仅是测试,没有发现问题)

5、VG 中移除 PV

shell > vgdisplay my_vg
  --- Volume group ---
  VG Name my_vg
  System ID
  Format lvm2
  Metadata Areas 3
  Metadata Sequence No 6
  VG Access read/write
  VG Status resizable
  MAX LV 0
  Cur LV 1
  Open LV 1
  Max PV 0
  Cur PV 3
  Act PV 3
  VG Size 3.02 GiB
  PE Size 4.00 MiB
  Total PE 774
  Alloc PE / Size 637 / 2.49 GiB
  Free PE / Size 137 / 548.00 MiB
  VG UUID ynCJG8-ZIvI-9gBF-dO5K-aQws-N9WW-r26hch

## 首先我们 vgdisplay my_vg ,发现 VG 空闲 548M

shell > pvdisplay
  --- Physical volume ---
  PV Name /dev/sdb1
  VG Name my_vg
  PV Size 1.01 GiB / not usable 3.41 MiB
  Allocatable yes (but full)
  PE Size 4.00 MiB
  Total PE 258
  Free PE 0
  Allocated PE 258
  PV UUID JB8X8v-jBPU-eOiN-aEOU-TOig-tv01-SuHytd

  --- Physical volume ---
  PV Name /dev/sdb2
  VG Name my_vg
  PV Size 1.01 GiB / not usable 3.44 MiB
  Allocatable yes (but full)
  PE Size 4.00 MiB
  Total PE 258
  Free PE 0
  Allocated PE 258
  PV UUID YXBMJJ-RyG3-z1xa-tlw6-piaI-cTgj-SIBIlz

  --- Physical volume ---
  PV Name /dev/sdb3
  VG Name my_vg
  PV Size 1.01 GiB / not usable 3.44 MiB
  Allocatable yes
  PE Size 4.00 MiB
  Total PE 258
  Free PE 137
  Allocated PE 121
  PV UUID jSpEdJ-fxZh-LP27-rFIM-0gnO-mL2x-PpBJpK

## 其次使用 pvdisplay 查看 PV 的使用情况发现:
/dev/sdb1 PE 空闲 0
/dev/sdb2 PE 空闲 0
/dev/sdb3 PE 空闲 137 (上图显示每个 PE 为 4M ,那么 /dev/sdb3 总空闲容量=137*4 = 548M)
## 正好等于 VG 的空闲大小,而 PV /dev/sdb3 大小为 1G ,也就是说有部分空间被占用,所以无法移除该 PV

shell > vgreduce my_vg /dev/sdb3
  Physical volume "/dev/sdb3" still in use
shell > umount /data/
shell > vgreduce my_vg /dev/sdb3
  Physical volume "/dev/sdb3" still in use

## 提示正在被占用,无法移除( umount 分区也不行 )

shell > umount /data/

shell > e2fsck -f /dev/my_vg/my_lv
e2fsck 1.41.12 (17-May-2010)
第一步: 检查inode,块,和大小
第二步: 检查目录结构
第3步: 检查目录连接性
Pass 4: Checking reference counts
第5步: 检查簇概要信息
/dev/my_vg/my_lv: 14/163840 files (0.0% non-contiguous), 289591/652288 blocks

shell > resize2fs /dev/my_vg/my_lv 2G
resize2fs 1.41.12 (17-May-2010)
Resizing the filesystem on /dev/my_vg/my_lv to 524288 (4k) blocks.
The filesystem on /dev/my_vg/my_lv is now 524288 blocks long.

shell > lvreduce -L -500M /dev/my_vg/my_lv
  WARNING: Reducing active logical volume to 2.00 GiB
  THIS MAY DESTROY YOUR DATA (filesystem etc.)
  Do you really want to reduce my_lv? [y/n]: y
  Size of logical volume my_vg/my_lv changed from 2.49 GiB (637 extents) to 2.00 GiB (512 extents).
  Logical volume my_lv successfully resized

## 我们把 LV 缩小了 500M

shell > vgdisplay my_vg
  --- Volume group ---
  VG Name my_vg
  System ID
  Format lvm2
  Metadata Areas 3
  Metadata Sequence No 9
  VG Access read/write
  VG Status resizable
  MAX LV 0
  Cur LV 1
  Open LV 0
  Max PV 0
  Cur PV 3
  Act PV 3
  VG Size 3.02 GiB
  PE Size 4.00 MiB
  Total PE 774
  Alloc PE / Size 512 / 2.00 GiB
  Free PE / Size 262 / 1.02 GiB
  VG UUID ynCJG8-ZIvI-9gBF-dO5K-aQws-N9WW-r26hch

## 现在再看 VG 大小 空闲 1G

shell > pvdisplay
  --- Physical volume ---
  PV Name /dev/sdb3
  VG Name my_vg
  PV Size 1.01 GiB / not usable 3.44 MiB
  Allocatable yes
  PE Size 4.00 MiB
  Total PE 258
  Free PE 258
  Allocated PE 0
  PV UUID jSpEdJ-fxZh-LP27-rFIM-0gnO-mL2x-PpBJpK

## pvdisplay 也发现 /dev/sdb3 正好全部空闲

shell > vgreduce my_vg /dev/sdb3
  Removed "/dev/sdb3" from volume group "my_vg"

## 已经成功将 PV /dev/sdb3 从 VG my_vg 中移除

shell > vgs
  VG #PV #LV #SN Attr VSize VFree
  my_vg 2 1 0 wz--n- 2.02g 16.00m

## 使用 vgs 可以看到 vg my_vg 中包含 PV 数为 2

6、删除 PV

shell > pvremove /dev/sdb3
  Labels on physical volume "/dev/sdb3" successfully wiped

## 使用 pvremove 删除 PV /dev/sdb3

shell > pvs
  PV VG Fmt Attr PSize PFree
  /dev/sdb1 my_vg lvm2 a-- 1.01g 0
  /dev/sdb2 my_vg lvm2 a-- 1.01g 16.00m

## 使用 pvs 看到只有两个 PV 了
## 然后 fdisk /dev/sdb 将 sdb3 的 ID 改为 83 ,保存
mkfs.ext4 /dev/sdb3 ,重新挂载到目录,至此 /dev/sdb3 成为普通分区

四、删除整个 lv vg pv

shell > umount /data/
shell > lvremove /dev/my_vg/my_lv
  Do you really want to remove active logical volume my_lv? [y/n]: y
  Logical volume "my_lv" successfully removed
  shell > vgremove my_vg
  Volume group "my_vg" successfully removed
shell > pvremove /dev/sdb1
  Labels on physical volume "/dev/sdb1" successfully wiped
shell > pvremove /dev/sdb2
  Labels on physical volume "/dev/sdb2" successfully wiped

## 删除比创建容易多了 ...

逻辑卷管理,lvm逻辑卷 简介: LVM ( Logical Volume Manager ) 逻辑卷管理 一、创建 LV 1、首先在你的虚拟机上添加一块新的硬盘用来做实验。...

一 创建逻辑卷

1准备分区或硬盘

这里使用/dev/sdb、/dev/sdc两块硬盘和/dev/sda9、/dev/sda10两个分区,大小都为1G,磁盘有限,我也不想这么抠的。

添加分区/dev/sda9、/dev/sda10

[root@centos7 ~]# fdisk /dev/sda

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
All primary partitions are in use
Adding logical partition 9
First sector (31885312-41943039, default 31885312):
Using default value 31885312
Last sector, +sectors or +size{K,M,G} (31885312-41943039, default 41943039): +1G
Partition 9 of type Linux and of size 1 GiB is set

注意,要修改分区类型为Linux LVM

Command (m for help): t
Partition number (1-9, default 9): 8e
Partition number (1-9, default 9): 9
Hex code (type L to list all codes): 8e
Changed type of partition 'Linux' to 'Linux LVM'
Command (m for help):

同样的方法创建/dev/sda10。

[root@centos7 ~]# lsblk

NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 20G 0 disk
├─sda9 8:9 0 1G 0 part
└─sda10 8:10 0 1G 0 part
sdb 8:16 0 1G 0 disk
sdc 8:32 0 1G 0 disk

2 创建PV(物理卷)

命令格式为:pvcreate DEVICE,可以一次创建一个设备,也可以一次创建多个设备。

查看物理卷命令:pvdisplay(查看详细信息)、pvs(查看简易信息)

[root@centos7 ~]# pvcreate /dev/sda9

Physical volume "/dev/sda9" successfully created.
[root@centos7 ~]# pvcreate /dev/sda10 /dev/sdb /dev/sdc
Physical volume "/dev/sda10" successfully created.
Physical volume "/dev/sdb" successfully created.
Physical volume "/dev/sdc" successfully created.

查看物理卷,看到已经成功创建。

[root@centos7 ~]# pvs
PV VG Fmt Attr PSize PFree
/dev/sda10 lvm2 --- 1.00g 1.00g
/dev/sda9 lvm2 --- 1.00g 1.00g
/dev/sdb lvm2 --- 1.00g 1.00g
/dev/sdc lvm2 --- 1.00g 1.00g

3 创建卷组(VG)

命令格式为:vgcreate -s PE VGNAME(vg名) DEVICE(设备名)

-s :指定物理扩展块大小 既就是PE的大小

查看命令:vgs、vgdisplay

[root@centos7 ~]# vgcreate -s 16M vg0 /dev/sda9 /dev/sda10 /dev/sdb /dev/sdc

Volume group "vg0" successfully created

查看一下

[root@centos7 ~]# vgs

VG #PV #LV #SN Attr VSize VFree
vg0 4 0 0 wz--n- 3.94g 3.94g

再来看下详细信息

[root@centos7 ~]# vgdisplay

--- Volume group ---
VG Name vg0
System ID
Format lvm2
Metadata Areas 4
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 4
Act PV 4
VG Size 3.94 GiB
PE Size 16.00 MiB
Total PE 252
Alloc PE / Size 0 / 0
Free PE / Size 252 / 3.94 GiB
VG UUID qmoIMg-5wQR-GKCS-dpq9-HLrt-zVIi-JBC9ZX

一切都复合预期,大小约为4G,正好是两个分区和两个硬盘之和。

4创建逻辑卷(LV)

命令格式为:lvcreate -n LVNAME(指定LV名) -L SIZE(指定LV的大小) vg0(要使用的VG)

-l 指定PE 大小

查看命令(类似PV、VG):lvs、lvdisplay

[root@centos7 ~]# lvcreate -n lv0 -L 3G vg0

Logical volume "lv0" created.

创建成功,查看一下

[root@centos7 ~]# lvs

LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
lv0 vg0 -wi-a----- 3.00g

再看下详细信息

[root@centos7 ~]# lvdisplay

--- Logical volume ---
LV Path /dev/vg0/lv0
LV Name lv0
VG Name vg0
LV UUID 622i7m-uy6s-3nZI-8xSb-sxrR-cZzz-C9pwkd
LV Write Access read/write
LV Creation host, time centos7.3.loacl, 2017-04-25 16:25:13 +0800
LV Status available
# open 0
LV Size 3.00 GiB
Current LE 192
Segments 4
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 253:0

可以确定已经成功创建。

现在就可以把/dev/vg0/lv0当做一块硬盘使用了。

现在看一下磁盘信息,已经发生了变化。

[root@centos7 ~]# lsblk

NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
fd0 2:0 1 4K 0 disk
sda 8:0 0 20G 0 disk
├─sda9 8:9 0 1G 0 part
│ └─vg0-lv0 253:0 0 3G 0 lvm
└─sda10 8:10 0 1G 0 part
└─vg0-lv0 253:0 0 3G 0 lvm
sdb 8:16 0 1G 0 disk
└─vg0-lv0 253:0 0 3G 0 lvm
sdc 8:32 0 1G 0 disk
└─vg0-lv0 253:0 0 3G 0 lvm

永利平台娱乐,可以看到,所加入的分区和硬盘已经属于vg0-lv0了。

5 创建文件系统,格式化

mkfs.ext4 /dev/vg0/lv0

[root@centos7 ~]# mkfs.ext4 /dev/vg0/lv0

6 挂载使用

[root@centos7 ~]# mkdir /mnt/lv0

[root@centos7 ~]# mount /dev/vg0/lv0 /mnt/lv0

 

二 扩展LV

 

扩展命令格式:

TAG标签:
版权声明:本文由永利平台娱乐发布于每日更新,转载请注明出处:/dev/sdb 就是我新添加的磁盘了,一 创建逻辑卷