LVM学习逻辑卷管理创建逻辑卷遇到的问题

系统 内核 发行版本
CentOS 2.6.32-754.2.1.el6.x86_64 CentOS release 6.10 (Final)

[root@www ~]# yum install xfsprogs
Loaded plugins: fastestmirror, security
Setting up Install Process
Loading mirror speeds from cached hostfile
Resolving Dependencies
--> Running transaction check
---> Package xfsprogs.x86_64 0:3.1.1-20.el6 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

======================================================================================================
 Package                Arch                  Version                      Repository          Size
======================================================================================================
Installing:
 xfsprogs                x86_64                3.1.1-20.el6                base                725 k

Transaction Summary
======================================================================================================
Install      1 Package(s)

Total download size: 725 k
Installed size: 3.2 M
Is this ok [y/N]: y
Downloading Packages:
xfsprogs-3.1.1-20.el6.x86_64.rpm                                              | 725 kB    00:00    
Running rpm_check_debug
Running Transaction Test
Transaction Test Succeeded
Running Transaction
  Installing : xfsprogs-3.1.1-20.el6.x86_64                                                      1/1 
  Verifying  : xfsprogs-3.1.1-20.el6.x86_64                                                      1/1

Installed:
  xfsprogs.x86_64 0:3.1.1-20.el6                                                                     

Complete!

[root@www ~]# pvcreate /dev/sdb
  Device /dev/sdb not found (or ignored by filtering)

开始尝试使用partprobe /dev/sdb但是没有用处,后来用如下命令解决.
[root@www ~]# dd if=/dev/urandom of=/dev/sdb bs=512 count=64
64+0 records in
64+0 records out
32768 bytes (33 kB) copied, 0.0513912 s, 638 kB/s
[root@www ~]# lsblk
NAME  MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sr0    11:0    1  4.3G  0 rom  
sda      8:0    0  20G  0 disk 
├─sda1  8:1    0  200M  0 part /boot
├─sda2  8:2    0    1G  0 part [SWAP]
└─sda3  8:3    0 18.8G  0 part /
sdb      8:16  0    1G  0 disk 
sdc      8:32  0    1G  0 disk 
sdd      8:48  0    1G  0 disk 
sde      8:64  0    1G  0 disk 
[root@www ~]# pvcreate /dev/sdb
  Physical volume "/dev/sdb" successfully created
[root@www ~]#

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


为什么会报如上的错误呢,我现在还没有搞清楚.
[root@www ~]# vgcreate storage /dev/sdb /dev/sdc /dev/sdd
  Volume group "storage" successfully created
[root@www ~]# vgs
  VG      #PV #LV #SN Attr  VSize VFree
  storage  3  0  0 wz--n- 2.99g 2.99g
[root@www ~]# pvs
  PV        VG      Fmt  Attr PSize    PFree  
  /dev/sdb  storage lvm2 a--u 1020.00m 1020.00m
  /dev/sdc  storage lvm2 a--u 1020.00m 1020.00m
  /dev/sdd  storage lvm2 a--u 1020.00m 1020.00m

[root@www ~]# lvcreate -n vo -L 150M storage
  Rounding up size to full physical extent 152.00 MiB
  Logical volume "vo" created.
[root@www ~]# lvs
  LV  VG      Attr      LSize  Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  vo  storage -wi-a----- 152.00m 

[root@www ~]# mkfs.xfs /dev/storage/vo
meta-data=/dev/storage/vo        isize=256    agcount=4, agsize=9728 blks
        =                      sectsz=512  attr=2, projid32bit=0
data    =                      bsize=4096  blocks=38912, imaxpct=25
        =                      sunit=0      swidth=0 blks
naming  =version 2              bsize=4096  ascii-ci=0
log      =internal log          bsize=4096  blocks=1200, version=2
        =                      sectsz=512  sunit=0 blks, lazy-count=1
realtime =none                  extsz=4096  blocks=0, rtextents=0
[root@www ~]# mount /dev/storage/vo /soft/
[root@www ~]# ls /soft/
[root@www ~]#


永久挂载,重启后生效,这里可以使用/dev/storage/vo也可以使用uuid推荐使用后者.
UUID="645e5ca4-d564-425b-ad50-a9d43536951f" /soft xfs  defaults        0 0


可以使用umount /soft卸载,再使用mount -a检查一下有没有挂载成功.使用df -h查看分区情况
[root@www ~]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/sda3              19G  1.7G  16G  10% /
tmpfs                490M    0  490M  0% /dev/shm
/dev/sda1            190M  59M  122M  33% /boot
/dev/mapper/storage-vo
                      148M  7.8M  140M  6% /soft


扩容逻辑卷

这里使用lvextend -l 50指定200M大小的逻辑卷,计算方法为4M*50.
[root@www ~]# lvextend -l 50 /dev/storage/vo
  Size of logical volume storage/vo changed from 152.00 MiB (38 extents) to 200.00 MiB (50 extents).
  Logical volume vo successfully resized.

[root@www ~]# lvs
  LV  VG      Attr      LSize  Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  vo  storage -wi-a----- 200.00m 

新硬盘加入vg卷组
[root@www ~]# pvcreate /dev/sde
  Physical volume "/dev/sde" successfully created
[root@www ~]# pvs
  PV        VG      Fmt  Attr PSize    PFree  
  /dev/sdb  storage lvm2 a--u 1020.00m  820.00m
  /dev/sdc  storage lvm2 a--u 1020.00m 1020.00m
  /dev/sdd  storage lvm2 a--u 1020.00m 1020.00m
  /dev/sde          lvm2 ----    1.00g    1.00g

[root@www ~]# vgextend storage /dev/sde
  Volume group "storage" successfully extended
[root@www ~]# vgs
  VG      #PV #LV #SN Attr  VSize VFree
  storage  4  1  0 wz--n- 3.98g 3.79g

[root@www ~]# pvs
  PV        VG      Fmt  Attr PSize    PFree  
  /dev/sdb  storage lvm2 a--u 1020.00m  820.00m
  /dev/sdc  storage lvm2 a--u 1020.00m 1020.00m
  /dev/sdd  storage lvm2 a--u 1020.00m 1020.00m
  /dev/sde  storage lvm2 a--u 1020.00m 1020.00m


从vg卷组移除一块硬盘
[root@www ~]# vgreduce storage /dev/sde
  Removed "/dev/sde" from volume group "storage"
[root@www ~]# vgs
  VG      #PV #LV #SN Attr  VSize VFree
  storage  3  1  0 wz--n- 2.99g 2.79g
[root@www ~]# pvs
  PV        VG      Fmt  Attr PSize    PFree  
  /dev/sdb  storage lvm2 a--u 1020.00m  820.00m
  /dev/sdc  storage lvm2 a--u 1020.00m 1020.00m
  /dev/sdd  storage lvm2 a--u 1020.00m 1020.00m
  /dev/sde          lvm2 ----    1.00g    1.00g


逻辑卷裁剪大小为120M
[root@www ~]# lvreduce -L 120M /dev/storage/vo
  WARNING: Reducing active logical volume to 120.00 MiB.
  THIS MAY DESTROY YOUR DATA (filesystem etc.)
Do you really want to reduce storage/vo? [y/n]: y
  Size of logical volume storage/vo changed from 200.00 MiB (50 extents) to 120.00 MiB (30 extents).
  Logical volume vo successfully resized.
[root@www ~]# lvs
  LV  VG      Attr      LSize  Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  vo  storage -wi-a----- 120.00m                                                    
[root@www ~]#


删除逻辑卷,依次删除lv逻辑卷,gv卷组,pv物理卷
[root@www ~]# lvremove /dev/storage/vo
Do you really want to remove active logical volume vo? [y/n]: y
  Logical volume "vo" successfully removed
[root@www ~]# lvs
[root@www ~]# vgremove storage
  Volume group "storage" successfully removed
[root@www ~]# vgs
[root@www ~]# pvremove /dev/sde
  Labels on physical volume "/dev/sde" successfully wiped
[root@www ~]# pvs
  PV        VG  Fmt  Attr PSize PFree
  /dev/sdb        lvm2 ---- 1.00g 1.00g
  /dev/sdc        lvm2 ---- 1.00g 1.00g
  /dev/sdd        lvm2 ---- 1.00g 1.00g
[root@www ~]# pvremove /dev/sdd /dev/sdc /dev/sdb
  Labels on physical volume "/dev/sdd" successfully wiped
  Labels on physical volume "/dev/sdc" successfully wiped
  Labels on physical volume "/dev/sdb" successfully wiped
[root@www ~]# pvs

 

数据迁移,首先创建一些文件touch /soft/{00..100}.txt,然后进行数据迁移.
[root@www ~]# pvs
  PV        VG      Fmt  Attr PSize    PFree  
  /dev/sdb  oradata lvm2 a--u 1020.00m  140.00m
  /dev/sdc  oradata lvm2 a--u 1020.00m 1020.00m
  /dev/sdd  oradata lvm2 a--u 1020.00m 1020.00m
  /dev/sde  oradata lvm2 a--u 1020.00m 1020.00m

[root@www ~]# pvmove /dev/sdb /dev/sdd
  /dev/sdb: Moved: 0.9%
  /dev/sdb: Moved: 36.4%
  /dev/sdb: Moved: 54.5%
  /dev/sdb: Moved: 100.0%
[root@www ~]# pvs
  PV        VG      Fmt  Attr PSize    PFree  
  /dev/sdb  oradata lvm2 a--u 1020.00m 1020.00m
  /dev/sdc  oradata lvm2 a--u 1020.00m 1020.00m
  /dev/sdd  oradata lvm2 a--u 1020.00m  140.00m
  /dev/sde  oradata lvm2 a--u 1020.00m 1020.00m
[root@www ~]#


迁移后查看文件并没有丢失,最后删除这些文件.
[root@www ~]# ls /soft/
000.txt  010.txt  020.txt  030.txt  040.txt  050.txt  060.txt  070.txt  080.txt  090.txt  100.txt
001.txt  011.txt  021.txt  031.txt  041.txt  051.txt  061.txt  071.txt  081.txt  091.txt  
002.txt  012.txt  022.txt  032.txt  042.txt  052.txt  062.txt  072.txt  082.txt  092.txt
003.txt  013.txt  023.txt  033.txt  043.txt  053.txt  063.txt  073.txt  083.txt  093.txt
004.txt  014.txt  024.txt  034.txt  044.txt  054.txt  064.txt  074.txt  084.txt  094.txt
005.txt  015.txt  025.txt  035.txt  045.txt  055.txt  065.txt  075.txt  085.txt  095.txt
006.txt  016.txt  026.txt  036.txt  046.txt  056.txt  066.txt  076.txt  086.txt  096.txt
007.txt  017.txt  027.txt  037.txt  047.txt  057.txt  067.txt  077.txt  087.txt  097.txt
008.txt  018.txt  028.txt  038.txt  048.txt  058.txt  068.txt  078.txt  088.txt  098.txt
009.txt  019.txt  029.txt  039.txt  049.txt  059.txt  069.txt  079.txt  089.txt  099.txt

[root@www ~]# find /soft/ -type f -size 0 -delete

原文来自：

本文地址：//lrxjmw.cn/lvmlogica-lvolume-management.html编辑：王健达，审核员：逄增宝

本文原创地址：//lrxjmw.cn/lvmlogica-lvolume-management.html编辑：坑人小妖精，审核员：暂无