Growing the Root Partition with Swap Partition at End of Disk

To begin, grow the size of the first disk space by expanding storage via the hypervisor or cloud platform. Generally, the appliance will pick up the new disk space, but a reboot is recommended to ensure that the instance recognizes the increase.

After the reboot, log into the instance as smeconfiguser and become the root user:

su -

Check the current size of the root partition:

df -h

Sample Output:

Filesystem      Size  Used Avail Use% Mounted on
/dev/vda2        26G  2.6G   24G  10% /
devtmpfs        3.9G     0  3.9G   0% /dev
tmpfs           3.9G     0  3.9G   0% /dev/shm
tmpfs           3.9G  8.5M  3.9G   1% /run
tmpfs           3.9G     0  3.9G   0% /sys/fs/cgroup
/dev/vdb1        36G   79M   34G   1% /var/lib/mysql
/dev/vda1       509M  118M  392M  24% /boot
tmpfs           591M     0  591M   0% /run/user/5000
tmpfs           591M     0  591M   0% /run/user/5003
tmpfs           591M     0  591M   0% /run/user/0
tmpfs           591M     0  591M   0% /run/user/5001

In the example above the root partition has 24GB free and is mounted on /dev/vda2

Next disable system swap:

swapoff -a
sed -i '/swap/d' /etc/fstab

Ensure the partition manager tools are installed:

yum install cloud-utils-growpart parted -y

Get the id of the first disk:

ll /dev/*da

Sample Output:

brw-rw----. 1 root disk 253, 0 Jan 19 18:37 /dev/vda

In our example above the first disk is /dev/vda, however, in your environment the name might be different. Other common names would be /dev/sda or /dev/xvda

List the partitions on the first disk substituting your disk for /dev/vda in the example below:

parted /dev/vda print

Sample Output:

Model: Virtio Block Device (virtblk)
Disk /dev/vda: 38.7GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Disk Flags:

Number  Start   End     Size    Type     File system     Flags
 1      1049kB  538MB   537MB   primary  xfs             boot
 2      538MB   28.5GB  27.9GB  primary  xfs
 3      28.5GB  37.0GB  8590MB  primary  linux-swap(v1)

Remove the linux-swap partition:

In our example above the linux-swap partition is partition 3 and is the last partition on this disk. If your linux-swap partition is not the last partition or not listed, STOP at this point and contact support. You are most likely not following the proper set of instructions.

parted /dev/vda rm 3
parted /dev/vda print

Sample Output:

Model: Virtio Block Device (virtblk)
Disk /dev/vda: 38.7GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos
Disk Flags:

Number  Start   End     Size    Type     File system     Flags
 1      1049kB  538MB   537MB   primary  xfs             boot
 2      538MB   28.5GB  27.9GB  primary  xfs

Grow the root partition (partition #2):

growpart /dev/vda 2 

Sample Output:

CHANGED: partition=2 start=1050624 old: size=54525952 end=55576576 new: size=200275935 end=201326559

Expand the root filesystem:

xfs_growfs /

Sample Output:

meta-data=/dev/vda2              isize=512    agcount=6, agsize=1703936 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=1        finobt=0 spinodes=0
data     =                       bsize=4096   blocks=9305851, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=1
log      =internal               bsize=4096   blocks=3328, version=2
         =                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
data blocks changed from 9305851 to 25034491

Check the amount of available space on / partition to confirm success:

df -h

Sample Output:

Filesystem      Size  Used Avail Use% Mounted on
/dev/vda2        96G  2.9G   93G   4% /
devtmpfs        3.9G     0  3.9G   0% /dev
tmpfs           3.9G     0  3.9G   0% /dev/shm
tmpfs           3.9G  8.5M  3.9G   1% /run
tmpfs           3.9G     0  3.9G   0% /sys/fs/cgroup
/dev/vdb1        36G   79M   34G   1% /var/lib/mysql
/dev/vda1       509M  118M  392M  24% /boot
tmpfs           591M     0  591M   0% /run/user/5000
tmpfs           591M     0  591M   0% /run/user/5003
tmpfs           591M     0  591M   0% /run/user/0
tmpfs           591M     0  591M   0% /run/user/5001

Recreate system swap:

dd if=/dev/zero of=/var/swapfile count=8192 bs=1MiB
chmod 600 /var/swapfile
mkswap /var/swapfile
swapon /var/swapfile
bash -c 'echo "/var/swapfile swap swap defaults 0 0" >> /etc/fstab'
free -h

Sample Output:

              total        used        free      shared  buff/cache   available
Mem:           7.8G        504M        134M        8.7M        7.2G        7.0G
Swap:          8.0G          0B        8.0G