Linux Logical Volume Expansion

Linux Logical Volume Expansion

 Keywords: pv (physical volumes), vg (volume group), lv (logical)

In the course of today with linux root partition size is not enough, suddenly remembered a long time did not update the blog, are concerned that the logical volume expansion issues now.

1. Check before expansion

Remember that / dev / mapper / rhel-root and so we will give it expansion, remember a good root partition type for xfs

[Hsun the root @ ~] DF # - hT 
file system type has been used% capacity with the available mount point
 / dev / Mapper / XFS 1OG the root-RHEL 6.7 g of 67% 3.4G / 
devtmpfs devtmpfs 1.9G 1.9G 0 0% / dev  tmpfs tmpfs 1.9G 1.9G. 1% 4.0 K / dev / SHM  tmpfs tmpfs 9.2M 1.9G 1.9G. 1% / RUN tmpfs tmpfs 1.9G 1.9G 0 0% / SYS / FS / a cgroup / dev / Mapper / usr-RHEL 68%. 12G 35G 24G, XFS / usr / dev / sda1 XFS 145M 870M 15% of 10-14m / Boot / dev / Mapper / var RHEL XFS-5.5G 2.6G 69% 8.0 g / var / dev / Mapper / 4.0G RHEL XFS-opt 32% 2.8G 1.3G / opt / dev / Mapper / tmp RHEL XFS-34M 4.0G 4.0G. 1% / tmp tmpfs tmpfs 378m 378m 0 0% / RUN / User / 1002 tmpfs tmpfs 378M 0 378M 0% /run/user/20001116 tmpfs tmpfs 378M 0 378M 0% /run/user/0

VG (volume group) can be seen that the root rhel

[root@hsun ~]# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
opt rhel -wi-ao---- 4.00g 
root rhel -wi-ao---- 13.90g 
swap rhel -wi-ao---- 8.00g 
tmp rhel -wi-ao---- 4.00g 
usr rhel -wi-ao---- <35.00g 
var rhel -wi-ao---- 8.00g

And vg (Volume group) and pv (physical volume) of free space are 0, so we have to increase a new disk

[root@hsun ~]# vgs
VG #PV #LV #SN Attr VSize VFree 
rhel 1 6 0 wz--n- <69.00g 0 
[root@hsun ~]# pvs
PV VG Fmt Attr PSize PFree
/dev/sda2 rhel lvm2 a-- <69.00g 0

Our first machine shutdown

[root@hsun ~]# poweroff -f
Powering off.

 2, add a new disk (the machine to insert a new hard drive)

Increase hard disk in VMware, the size of 4G. After the increase over the boot

 

3, disk expansion

Check the new drive after boot 3.1

You can see, just insert the disk has been read out, on my machine as / dev / sdb size of 4G

[root @ Hsun ~] # fdisk the -l | grep / dev / SD 
Disk / dev / sdb: 4294 MB, 4294967296 bytes, 8388608 sectors 
Disk / dev / sda: 75.2 GB, 75,161,927,680 bytes, 146.80064 million sectors
 / dev / sda1 * 2048  2,099,199  1048576  83 Linux
 / dev / sda2 2.0992 million  146 800 639  72.35072 million 8E Linux LVM

3.2 Creating PV

[root@hsun ~]# pvs
  PV         VG   Fmt  Attr PSize   PFree
  /dev/sda2  rhel lvm2 a--  <69.00g    0 
[root@hsun ~]# pvcreate /dev/sdb
  Physical volume "/dev/sdb" successfully created.
[root@hsun ~]# pvs
  PV         VG   Fmt  Attr PSize   PFree
  /dev/sda2  rhel lvm2 a--  <69.00g    0 
  /dev/sdb        lvm2 ---    4.00g 4.00g

3.3 PV of space assigned to the VG named rhel

[Hsun the root @ ~ ] # Vgs 
  VG of the Attr #PV #LV #SN VSize vfree 
  RHEL       . 1    . 6    0 WZ - N- < 69 .00g      0  
[Hsun the root @ ~] # the vgextend RHEL / dev / SDB 
  Volume Group " RHEL " Extended successfully 
[Hsun the root @ ~ ] # Vgs 
  vG of the Attr #PV #LV #SN VSize vfree 
  RHEL    2    . 6    0 WZ - N- 72 .99g < . 4 .00g 
see vg volume group has been successfully expanded to 69G 73G , the space remaining unused 4G

3.4 for expansion of the root logical operation

[root@hsun ~]# lvextend -L +3.9G /dev/rhel/root 
Rounding size to boundary between physical extents: 3.90 GiB.
Size of logical volume rhel/root changed from 10.00 GiB (2560 extents) to 13.90 GiB (3559 extents).
Logical volume rhel/root successfully resized.

3.5 Refresh capacity

Then refresh capacity, because the partition type xfs, so use the Refresh command xfs_growfs capacity

If the partition type is ext type, the refresh command with resize2fs

[root@hsun ~]# xfs_growfs /dev/rhel/root 

meta-data=/dev/mapper/rhel-root isize=512 agcount=4, agsize=655360 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0 spinodes=0
data = bsize=4096 blocks=2621440, 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 2621440 to 3644416

Now you see a root expansion has been completed, the size of 14G

[Hsun the root @ ~] # DF - hT 
file system type has been used with the available capacity % mount point
 / dev / Mapper / XFS RHEL the root-14G   . 6 .7G   . 7 .3 G    49 % / 
devtmpfs devtmpfs   . 1 .9 g      0   . 1 . 9G     0 % / dev 
tmpfs tmpfs      . 1 .9 g   . 4 .0K   . 1 .9 g     . 1 % / dev / SHM 
tmpfs tmpfs      . 1 .9 g   9.2M   . 1 .9 g     . 1 % / RUN
tmpfs                 tmpfs     1.9G     0  1.9G    0% /sys/fs/cgroup
/dev/mapper/rhel-usr  xfs        35G   24G   12G   68% /usr
/dev/sda1             xfs      1014M  145M  870M   15% /boot
/dev/mapper/rhel-var  xfs       8.0G  5.5G  2.6G   69% /var
/dev/mapper/rhel-opt  xfs       4.0G  1.3G  2.8G   32% /opt
/dev/mapper/rhel-tmp  xfs       4.0G   34M  4.0G    1% /tmp
tmpfs                 tmpfs     378M     0  378M    0% /run/user/1002
tmpfs                 tmpfs     378M     0  378M    0% /run/user/20001116
tmpfs                 tmpfs     378M     0  378M    0% /run/user/0

Logical expansion ended.

 

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I am new to linux, linux chiefs hope that the exhibitions.