LVM逻辑卷的创建

相关结构框架

PE：物理块默认4M大小
PV：物理卷
VG：卷组
LV：逻辑卷
LE:可被寻址的基本单位，在同一个卷组中，LE的大小和PE是相同的，并且一一对应
在这里插入图片描述
1、准备物理磁盘：可以是普通磁盘也可以是raid磁盘
在这里我创建了4个分区（sdb1，sdb2，sdb3，sdb5）
2、创建PV（创建2块pv 大小100M）

[root@wangteng ~]# pvcreate /dev/sdb{1,2}
  Physical volume "/dev/sdb1" successfully created
  Physical volume "/dev/sdb2" successfully created
[root@wangteng ~]# df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/sda2       9.8G  1.6G  7.8G  17% /
tmpfs           491M     0  491M   0% /dev/shm
/dev/sda1       190M   30M  150M  17% /boot
[root@wangteng ~]# pvs
  PV         VG   Fmt  Attr PSize   PFree
  /dev/sdb1       lvm2 ---- 109.79m 109.79m
  /dev/sdb2       lvm2 ---- 109.82m 109.82m


[root@wangteng ~]# pvscan
  PV /dev/sdb1                      lvm2 [109.79 MiB]
  PV /dev/sdb2                      lvm2 [109.82 MiB]
 
 Total: 2 [219.61 MiB] / in use: 0 [0   ] / in no VG: 2 [219.61 MiB]

3、创建VG（创建一组vg1 大小100M）

这里是创建了名字为 myvg ，使用的是sdb1和sdb2

[root@wangteng ~]# vgcreate myvg /dev/sdb1 /dev/sdb2
  Volume group "myvg" successfully created
[root@wangteng ~]# vgs
  VG   #PV #LV #SN Attr   VSize   VFree
  myvg   2   0   0 wz--n- 216.00m 216.00m
[root@wangteng ~]# vgscan
  Reading all physical volumes.  This may take a while...
  Found volume group "myvg" using metadata type lvm2
[root@wangteng ~]# vgdisplay
  --- Volume group ---
  VG Name               myvg
  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               216.00 MiB
  PE Size               4.00 MiB
  Total PE              54
  Alloc PE / Size       0 / 0
  Free  PE / Size       54 / 216.00 MiB
  VG UUID               1uwvxP-0WzO-2MhY-oa3U-9cW9-wIpr-tYP81M

4、创建LV（创建lvm 大小100M）

[root@wangteng ~]# lvcreate -l 25 -n mylv myvg
  Logical volume "mylv" created.
[root@wangteng ~]# lvs
  LV   VG   Attr       LSize   Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  mylv myvg -wi-a----- 100.00m
[root@wangteng ~]# lvscan
  ACTIVE            '/dev/myvg/mylv' [100.00 MiB] inherit
[root@wangteng ~]# lvdisplay
  --- Logical volume ---
  LV Path                /dev/myvg/mylv
  LV Name                mylv
  VG Name                myvg
  LV UUID                xtS0Yt-0Pgi-fQFU-9E5N-v2ke-QaL6-yeVKJJ
  LV Write Access        read/write
  LV Creation host, time wangteng, 2020-04-01 20:11:47 +0800
  LV Status              available
  # open                 0
  LV Size                100.00 MiB
  Current LE             25
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:0

5、新增vg2 100M
将分区sdb3创建为新的vg

[root@wangteng ~]# vgcreate myvg1 /dev/sdb3
  Physical volume "/dev/sdb3" successfully created
  Volume group "myvg1" successfully created
[root@wangteng ~]# vgs
  VG    #PV #LV #SN Attr   VSize   VFree
  myvg    2   1   0 wz--n- 216.00m 116.00m
  myvg1   1   0   0 wz--n- 108.00m 108.00m
[root@wangteng ~]# pvs
  PV         VG    Fmt  Attr PSize   PFree
  /dev/sdb1  myvg  lvm2 a--u 108.00m   8.00m
  /dev/sdb2  myvg  lvm2 a--u 108.00m 108.00m
  /dev/sdb3  myvg1 lvm2 a--u 108.00m 108.00m

6、扩容vg1 +100
首先创建分区sdb5为pv，让后将它扩展给第一组vg

[root@wangteng ~]# pvcreate /dev/sdb5
  Physical volume "/dev/sdb5" successfully created
[root@wangteng ~]# pvs
  PV         VG    Fmt  Attr PSize   PFree
  /dev/sdb1  myvg  lvm2 a--u 108.00m   8.00m
  /dev/sdb2  myvg  lvm2 a--u 108.00m 108.00m
  /dev/sdb3  myvg1 lvm2 a--u 108.00m 108.00m
  /dev/sdb5        lvm2 ---- 109.79m 109.79m
[root@wangteng ~]# vgextend myvg /dev/sdb5
  Volume group "myvg" successfully extended
[root@wangteng ~]# vgs
  VG    #PV #LV #SN Attr   VSize   VFree
  myvg    3   1   0 wz--n- 324.00m 224.00m
  myvg1   1   0   0 wz--n- 108.00m 108.00m
[root@wangteng ~]# lvs
  LV   VG   Attr       LSize   Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  mylv myvg -wi-a----- 100.00m

7、扩容LV 300M
-L 使用用法：+数字，为原本的基础上继续增大多少
没有+，为增大到多少

[root@wangteng ~]# lvextend -L 300M /dev/myvg/mylv
  Size of logical volume myvg/mylv changed from 100.00 MiB (25 extents) to 300.00 MiB (75 extents).
  Logical volume mylv successfully resized.
[root@wangteng ~]# lvs
  LV   VG   Attr       LSize   Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  mylv myvg -wi-a----- 300.00m

8、格式化lv ext4格式

[root@wangteng ~]# mkfs.ext4 /dev/myvg/mylv
mke2fs 1.41.12 (17-May-2010)
文件系统标签=
操作系统:Linux
块大小=1024 (log=0)
分块大小=1024 (log=0)
Stride=0 blocks, Stripe width=0 blocks
76912 inodes, 307200 blocks
15360 blocks (5.00%) reserved for the super user
第一个数据块=1
Maximum filesystem blocks=67633152
38 block groups
8192 blocks per group, 8192 fragments per group
2024 inodes per group
Superblock backups stored on blocks:
        8193, 24577, 40961, 57345, 73729, 204801, 221185

正在写入inode表: 完成
Creating journal (8192 blocks): 完成
Writing superblocks and filesystem accounting information: 完成

This filesystem will be automatically checked every 35 mounts or
180 days, whichever comes first.  Use tune2fs -c or -i to override.

9、挂载到 /mnt/mylv
首先创建 /mnt/mylv 目录

[root@wangteng ~]# mkdir /mnt/mylv
[root@wangteng ~]# mount /dev/myvg/mylv /mnt/mylv/
[root@wangteng ~]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/sda2             9.8G  1.6G  7.8G  17% /
tmpfs                 491M     0  491M   0% /dev/shm
/dev/sda1             190M   30M  150M  17% /boot
/dev/mapper/myvg-mylv
                      283M  2.1M  266M   1% /mnt/mylv
[root@wangteng ~]# cd /mnt/mylv/
[root@wangteng mylv]# ls
lost+found

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