Linux主机lv操作篇-扩容homelv

记录一些自己的心得以及方法,本着共同学习,互相进步为目的。本次总结了Linux主机扩容homelv的方法,其他扩容lv的方法也是类似,欢迎大家评论留言,本次操作是在线扩容homelv,其他扩容lv的方法也类似。(以下是扩容homelv的操作,均在试验机上操作,并且在实际工程环境中有验证过,目前配置过的OS有centos7.7)。
一、主机环境:
1、系统版本:

root@xuhs:/root>cat /etc/redhat-release 
CentOS Linux release 7.7.1908 (Core)
root@xuhs:/root>

2、系统环境中分区、pv、vg、lv如下:

root@xuhs:/root>lvs
  LV       VG   Attr       LSize   Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  homelv   hdvg -wi-ao----  <1.19g                                                    
  rootlv   hdvg -wi-ao---- <12.22g                                                    
  swaplv   hdvg -wi-ao----   2.00g                                                    
  tmplv    hdvg -wi-ao----  <1.19g                                                    
  varloglv hdvg -wi-ao----  <1.19g                                                    
  varlv    hdvg -wi-ao----  <1.19g                                                    
root@xuhs:/root>
root@xuhs:/root>pvs
  PV         VG   Fmt  Attr PSize   PFree
  /dev/sda2  hdvg lvm2 a--  <18.97g    0 
root@xuhs:/root>
root@xuhs:/root>vgs
  VG   #PV #LV #SN Attr   VSize   VFree
  hdvg   1   6   0 wz--n- <18.97g    0 
root@xuhs:/root>
root@xuhs:/root>fdisk -l
......
Disk /dev/sdb: 10.7 GB, 10737418240 bytes, 20971520 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
......

二、操作:
1、因为整个/dev/sdb都要划分给homelv,我们直接创建pv:

root@xuhs:/root>pvs
  PV         VG   Fmt  Attr PSize   PFree
  /dev/sda2  hdvg lvm2 a--  <18.97g    0 
root@xuhs:/root>
root@xuhs:/root>pvcreate /dev/sdb
  Physical volume "/dev/sdb" successfully created.
root@xuhs:/root>
root@xuhs:/root>pvs
  PV         VG   Fmt  Attr PSize   PFree 
  /dev/sda2  hdvg lvm2 a--  <18.97g     0 
  /dev/sdb        lvm2 ---   10.00g 10.00g

2、创建vg:

root@xuhs:/root>vgs
  VG   #PV #LV #SN Attr   VSize   VFree
  hdvg   1   6   0 wz--n- <18.97g    0 
root@xuhs:/root>
root@xuhs:/root>vgextend hdvg /dev/sdb
  Volume group "hdvg" successfully extended
root@xuhs:/root>
root@xuhs:/root>vgs
  VG   #PV #LV #SN Attr   VSize   VFree 
  hdvg   2   6   0 wz--n- <28.94g <9.97g

3、创建lv,本次扩容homelv,扩容其他lv也是同样的方法,如下:

root@xuhs:/root>lvs
  LV       VG   Attr       LSize   Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  homelv   hdvg -wi-ao----  <1.19g                                                    
  rootlv   hdvg -wi-ao---- <12.22g                                                    
  swaplv   hdvg -wi-ao----   2.00g                                                    
  tmplv    hdvg -wi-ao----  <1.19g                                                    
  varloglv hdvg -wi-ao----  <1.19g                                                    
  varlv    hdvg -wi-ao----  <1.19g                                                    
root@xuhs:/root>
root@xuhs:/root>lvextend -L +8G /dev/hdvg/homelv
  Size of logical volume hdvg/homelv changed from <1.19 GiB (38 extents) to <9.19 GiB (294 extents).
  Logical volume hdvg/homelv successfully resized.
root@xuhs:/root>
root@xuhs:/root>lvs
  LV       VG   Attr       LSize   Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  homelv   hdvg -wi-ao----  <9.19g                                                    
  rootlv   hdvg -wi-ao---- <12.22g                                                    
  swaplv   hdvg -wi-ao----   2.00g                                                    
  tmplv    hdvg -wi-ao----  <1.19g                                                    
  varloglv hdvg -wi-ao----  <1.19g                                                    
  varlv    hdvg -wi-ao----  <1.19g

以上我们可以看出已经成功扩容了homelv。
4、这时我们通过df -h查看还是显示扩容前的大小,需要使用xfs_growfs生效配置,操作如下:

root@xuhs:/root>df -h
Filesystem                 Size  Used Avail Use% Mounted on
devtmpfs                   470M     0  470M   0% /dev
tmpfs                      487M     0  487M   0% /dev/shm
tmpfs                      487M  8.0M  479M   2% /run
tmpfs                      487M     0  487M   0% /sys/fs/cgroup
/dev/mapper/hdvg-rootlv     13G  5.2G  7.1G  43% /
/dev/sda1                 1014M  171M  844M  17% /boot
/dev/mapper/hdvg-homelv    1.2G   33M  1.2G   3% /home
/dev/mapper/hdvg-varlv     1.2G  230M  977M  20% /var
/dev/mapper/hdvg-tmplv     1.2G   33M  1.2G   3% /tmp
/dev/mapper/hdvg-varloglv  1.2G   34M  1.2G   3% /var/log
tmpfs                       98M     0   98M   0% /run/user/0
root@xuhs:/root>
root@xuhs:/root>xfs_growfs /dev/hdvg/homelv
meta-data=/dev/mapper/hdvg-homelv isize=512    agcount=4, agsize=77824 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=1        finobt=0 spinodes=0
data     =                       bsize=4096   blocks=311296, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=1
log      =internal               bsize=4096   blocks=2560, version=2
         =                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
data blocks changed from 311296 to 2408448
root@xuhs:/root>

5、再次使用df -h查看后显示正常,现象如下:

root@xuhs:/root>df -h
Filesystem                 Size  Used Avail Use% Mounted on
devtmpfs                   470M     0  470M   0% /dev
tmpfs                      487M     0  487M   0% /dev/shm
tmpfs                      487M  8.0M  479M   2% /run
tmpfs                      487M     0  487M   0% /sys/fs/cgroup
/dev/mapper/hdvg-rootlv     13G  5.2G  7.1G  43% /
/dev/sda1                 1014M  171M  844M  17% /boot
/dev/mapper/hdvg-homelv    9.2G   34M  9.2G   1% /home
/dev/mapper/hdvg-varlv     1.2G  230M  977M  20% /var
/dev/mapper/hdvg-tmplv     1.2G   33M  1.2G   3% /tmp
/dev/mapper/hdvg-varloglv  1.2G   34M  1.2G   3% /var/log
tmpfs                       98M     0   98M   0% /run/user/0

三、xfs_growfs命令
1、xfs_growfs是用来干什么?

root@xuhs:/root>man xfs_growfs
NAME
       xfs_growfs, xfs_info - expand an XFS filesystem
DESCRIPTION
       xfs_growfs  expands an existing XFS filesystem (see xfs(5)).  The mount-point argument is the pathname of the directory where the filesystem is
       mounted. The filesystem must be mounted to be grown (see mount(8)).  The existing contents of the filesystem are  undisturbed,  and  the  added
       space becomes available for additional file storage.

xfs_growfs也就是说是扩展XFS文件系统用的,使用xfs_growfs这个命令,文件系统的现有内容不会受到干扰。感兴趣的朋友可以自己去研究一下。

2、语法:

xfs_growfs [ 参数 ]  mount-point  
如:
xfs_growfs  /dev/hdvg/homelv

中间的一些参数我们可以省略,感兴趣的朋友可以自己去研究。

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