The root filesystem is almost at full capacity. The filesystem must be increased.
This is a VM running on ESXi 5.5.
[root@ovicentos ~]# df -h
Filesystem Size Used Avail Use% Mounted on
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/centos-root 6.7G 6.2G 532M 93% /
In the VM's settings increase the provisioned size of the root disk.
In this example I increased the disk from 8 to 20GB.
[root@ovicentos ~]# pvdisplay
--- Physical volume ---
PV Name /dev/sda2
VG Name centos
PV Size 7.51 GiB / not usable 3.00 MiB
Allocatable yes
PE Size 4.00 MiB
Total PE 1922
Free PE 8
Allocated PE 1914
--- Physical volume ---
PV Name /dev/sda2
VG Name centos
PV Size 7.51 GiB / not usable 3.00 MiB
Allocatable yes
PE Size 4.00 MiB
Total PE 1922
Free PE 8
Allocated PE 1914
PV UUID hGmOJA-KykA-ar7M-GORn-3gDE-Nvxf-u96ImL
Rescan the SCSI BUS.
[root@ovicentos ~]# echo 1 > /sys/class/scsi_device/2\:0\:0\:0/device/rescan
[root@ovicentos ~]# fdisk -l /dev/sda
Disk /dev/sda: 21.5 GB, 21474836480 bytes, 41943040 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
Disk label type: dos
Disk identifier: 0x000e3479
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 1026047 512000 83 Linux
[root@ovicentos ~]# fdisk -l /dev/sda
Disk /dev/sda: 21.5 GB, 21474836480 bytes, 41943040 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
Disk label type: dos
Disk identifier: 0x000e3479
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 1026047 512000 83 Linux
/dev/sda2 1026048 16777215 7875584 8e Linux LVM
Use fdisk to create a new partition
fdisk /dev/sda
Welcome to fdisk (util-linux 2.23.2).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.
Command (m for help):
Command (m for help): n
Partition type:
p primary (2 primary, 0 extended, 2 free)
e extended
Select (default p):
Using default response p
Partition number (3,4, default 3):
First sector (16777216-41943039, default 16777216):
Using default value 16777216
Last sector, +sectors or +size{K,M,G} (16777216-41943039, default 41943039):
Using default value 41943039
Partition 3 of type Linux and of size 12 GiB is set
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
WARNING: Re-reading the partition table failed with error 16: Device or resource busy.
The kernel still uses the old table. The new table will be used at
the next reboot or after you run partprobe(8) or kpartx(8)
Syncing disks.
[root@ovicentos ~]# partprobe
Welcome to fdisk (util-linux 2.23.2).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.
Command (m for help):
Command (m for help): n
Partition type:
p primary (2 primary, 0 extended, 2 free)
e extended
Select (default p):
Using default response p
Partition number (3,4, default 3):
First sector (16777216-41943039, default 16777216):
Using default value 16777216
Last sector, +sectors or +size{K,M,G} (16777216-41943039, default 41943039):
Using default value 41943039
Partition 3 of type Linux and of size 12 GiB is set
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
WARNING: Re-reading the partition table failed with error 16: Device or resource busy.
The kernel still uses the old table. The new table will be used at
the next reboot or after you run partprobe(8) or kpartx(8)
Syncing disks.
[root@ovicentos ~]# partprobe
[root@ovicentos ~]#
Create a new PV
[root@ovicentos ~]# pvcreate /dev/sda3
Physical volume "/dev/sda3" successfully created
Add the new PV to the root VG
[root@ovicentos ~]# vgextend centos /dev/sda3
Volume group "centos" successfully extended
[root@ovicentos ~]# vgs
VG #PV #LV #SN Attr VSize VFree
Volume group "centos" successfully extended
[root@ovicentos ~]# vgs
VG #PV #LV #SN Attr VSize VFree
centos 2 3 0 wz--n- 19.50g 12.03g
Increase the LV size :
[root@ovicentos ~]# lvextend -L+12G /dev/centos/root
Size of logical volume centos/root changed from 6.67 GiB (1707 extents) to 18.67 GiB (4779 extents).
Logical volume root successfully resized
[root@ovicentos ~]# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
docker-poolmeta centos -wi-a----- 8.00m
root centos -wi-ao---- 18.67g
swap centos -wi-ao---- 820.00m
Size of logical volume centos/root changed from 6.67 GiB (1707 extents) to 18.67 GiB (4779 extents).
Logical volume root successfully resized
[root@ovicentos ~]# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
docker-poolmeta centos -wi-a----- 8.00m
root centos -wi-ao---- 18.67g
swap centos -wi-ao---- 820.00m
[root@ovicentos ~]#
At this point the filesystem must be actually extended using xfs_growfs. Using '-d' will utilize the maximum available space.
[root@ovicentos ~]# xfs_growfs -d /
meta-data=/dev/mapper/centos-root isize=256 agcount=4, agsize=436992 blks
= sectsz=512 attr=2, projid32bit=1
= crc=0 finobt=0
data = bsize=4096 blocks=1747968, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=0
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 1747968 to 4893696
[root@ovicentos ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/centos-root 19G 6.2G 13G 33% /
devtmpfs 901M 0 901M 0% /dev
tmpfs 921M 68K 921M 1% /dev/shm
tmpfs 921M 33M 888M 4% /run
tmpfs 921M 0 921M 0% /sys/fs/cgroup
/dev/sda1 497M 120M 378M 25% /boot
/dev/md127 32G 49M 30G 1% /media
meta-data=/dev/mapper/centos-root isize=256 agcount=4, agsize=436992 blks
= sectsz=512 attr=2, projid32bit=1
= crc=0 finobt=0
data = bsize=4096 blocks=1747968, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=0
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 1747968 to 4893696
[root@ovicentos ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/centos-root 19G 6.2G 13G 33% /
devtmpfs 901M 0 901M 0% /dev
tmpfs 921M 68K 921M 1% /dev/shm
tmpfs 921M 33M 888M 4% /run
tmpfs 921M 0 921M 0% /sys/fs/cgroup
/dev/sda1 497M 120M 378M 25% /boot
/dev/md127 32G 49M 30G 1% /media
[root@ovicentos ~]#
Another can be adding a new virtual disk to this VM and creating the new PV on that Virtual Disk instead of creating a new partition.