LVM学习逻辑卷管理创建逻辑卷遇到的问题

1 实验环境

系统 内核 发行版本

由于是最小化安装没有xfs命令，yum安装如下包支持此命令

[root@www ~]# yum install xfsprogsLoaded plugins: fastestmirror, securitySetting up Install ProcessLoading mirror speeds from cached hostfileResolving Dependencies--> Running transaction check---> Package xfsprogs.x86_64 0:3.1.1-20.el6 will be installed--> Finished Dependency ResolutionDependencies Resolved====================================================================================================== Package                Arch                  Version                      Repository          Size======================================================================================================Installing: xfsprogs                x86_64                3.1.1-20.el6                base                725 kTransaction Summary======================================================================================================Install      1 Package(s)Total download size: 725 kInstalled size: 3.2 MIs this ok [y/N]: yDownloading Packages:xfsprogs-3.1.1-20.el6.x86_64.rpm                                              | 725 kB    00:00    Running rpm_check_debugRunning Transaction TestTransaction Test SucceededRunning Transaction  Installing : xfsprogs-3.1.1-20.el6.x86_64                                                      1/1   Verifying  : xfsprogs-3.1.1-20.el6.x86_64                                                      1/1Installed:  xfsprogs.x86_64 0:3.1.1-20.el6                                                                     Complete!

2 用gdisk分区对/dev/sdb分区然后再删除后遇到以下问题

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

3 解决方法

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=6464+0 records in64+0 records out32768 bytes (33 kB) copied, 0.0513912 s, 638 kB/s[root@www ~]# lsblkNAME  MAJ:MIN RM  SIZE RO TYPE MOUNTPOINTsr0    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

4 创建一个150M大小的逻辑卷

[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

5 把生成号的逻辑卷进行格式化,然后挂载使用.

[root@www ~]# mkfs.xfs /dev/storage/vometa-data=/dev/storage/vo        isize=256    agcount=4, agsize=9728 blks        =                      sectsz=512  attr=2, projid32bit=0data    =                      bsize=4096  blocks=38912, imaxpct=25        =                      sunit=0      swidth=0 blksnaming  =version 2              bsize=4096  ascii-ci=0log      =internal log          bsize=4096  blocks=1200, version=2        =                      sectsz=512  sunit=0 blks, lazy-count=1realtime =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 -hFilesystem            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/voDo 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.txt001.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.txt003.txt  013.txt  023.txt  033.txt  043.txt  053.txt  063.txt  073.txt  083.txt  093.txt004.txt  014.txt  024.txt  034.txt  044.txt  054.txt  064.txt  074.txt  084.txt  094.txt005.txt  015.txt  025.txt  035.txt  045.txt  055.txt  065.txt  075.txt  085.txt  095.txt006.txt  016.txt  026.txt  036.txt  046.txt  056.txt  066.txt  076.txt  086.txt  096.txt007.txt  017.txt  027.txt  037.txt  047.txt  057.txt  067.txt  077.txt  087.txt  097.txt008.txt  018.txt  028.txt  038.txt  048.txt  058.txt  068.txt  078.txt  088.txt  098.txt009.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

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