Volume Extension

2 min readSep 1, 2018

Here’s the steps to extend the volumes :

[root@tangier ~]# vgdisplay
  --- Volume group ---
  VG Name               centos
  System ID
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  4
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                3
  Open LV               3
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               931.02 GiB
  PE Size               4.00 MiB
  Total PE              238341
  Alloc PE / Size       238325 / 930.96 GiB
  Free  PE / Size       16 / 64.00 MiB
  VG UUID               mG9aJe-MlHN-YTBa-QE1l-xpMz-poYB-RqoqATvgextend centos /dev/sdb--- Volume group ---
  VG Name               centos
  System ID
  Format                lvm2
  Metadata Areas        2
  Metadata Sequence No  5
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                3
  Open LV               3
  Max PV                0
  Cur PV                2
  Act PV                2
  VG Size               1.36 TiB
  PE Size               4.00 MiB
  Total PE              357575
  Alloc PE / Size       238325 / 930.96 GiB
  Free  PE / Size       119250 / 465.82 GiB
  VG UUID               mG9aJe-MlHN-YTBa-QE1l-xpMz-poYB-RqoqAT

15% root 17887

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85% home 101363

lvextend -l +17887 /dev/centos/root
lvextend -l +101363 /dev/centos/home

These commands didn’t work for this plateforme

resize2fs /dev/centos/root
resize2fs /dev/centos/home

We had got this error :

resize2fs 1.42.9 (28-Dec-2013)
resize2fs: Bad magic number in super-block while trying to open /dev/centos/root
Couldn't find valid filesystem superblock.

The solution was :

using the command xfsgrowfs instead of resize2fs

[root@tangier ~]# xfs_growfs /dev/centos/root
meta-data=/dev/mapper/centos-root isize=256    agcount=4, agsize=3276800 blks
		 =                       sectsz=4096  attr=2, projid32bit=1
		 =                       crc=0        finobt=0 spinodes=0
data     =                       bsize=4096   blocks=13107200, imaxpct=25
		 =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=0
log      =internal               bsize=4096   blocks=6400, version=2
		 =                       sectsz=4096  sunit=1 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
data blocks changed from 13107200 to 31423488[root@tangier ~]# xfs_growfs /dev/centos/home
meta-data=/dev/mapper/centos-home isize=256    agcount=4, agsize=57480448 blks
		 =                       sectsz=4096  attr=2, projid32bit=1
		 =                       crc=0        finobt=0 spinodes=0
data     =                       bsize=4096   blocks=229921792, imaxpct=25
		 =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=0
log      =internal               bsize=4096   blocks=112266, version=2
		 =                       sectsz=4096  sunit=1 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
data blocks changed from 229921792 to 333717504

vgdisplay:

[root@tangier ~]# vgdisplay
--- Volume group ---
  VG Name               centos
  System ID
  Format                lvm2
  Metadata Areas        2
  Metadata Sequence No  7
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                3
  Open LV               3
  Max PV                0
  Cur PV                2
  Act PV                2
  VG Size               1.36 TiB
  PE Size               4.00 MiB
  Total PE              357575
  Alloc PE / Size       357575 / 1.36 TiB
  Free  PE / Size       0 / 0
  VG UUID               mG9aJe-MlHN-YTBa-QE1l-xpMz-poYB-RqoqAT