How to Increase Root Partition of CentOS 7 VMware

Part 1: Add a vmdk

1. Shutdown your CentOS 7 VMware and re-launch VMware player

2. Select your CentOS 7 VMware and click "Edit Virtual Machine Settings"

3. In the Hardware tab, click "Add.." button. "Add Hardware Wizard" dialog box will open

4. In the "Add hardware Wizard", select "Hard Disk". click "Next >"

5. Select "SCSI" as disk type. click "Next >"

6. Select "Create a new virtual disk". click "Next >"

7. Specify disk size in GB and select "Split virtual disk into multiple files." click "Next >"

8. Specify file name of the disk file. recommended to leave it as default. click "Finish".

9. In the "Virtual Machine Settings", you will now see "New Hard Disk" in the "Hardware" tab

Part 2: Configure LVM

1. Scan the host

find /sys -type f -iname "scan" -print

2. You will see the following list as shown below

[root@centos7vm localuser]# find /sys -type f -iname "scan" -print
/sys/devices/pci0000:00/0000:00:07.1/ata1/host1/scsi_host/host1/scan
/sys/devices/pci0000:00/0000:00:07.1/ata2/host2/scsi_host/host2/scan
/sys/devices/pci0000:00/0000:00:10.0/host0/scsi_host/host0/scan

3. Rescan the SCSI bus by passing to each host the "- - -".

# echo "- - -" > /sys/devices/pci0000:00/0000:00:07.1/ata1/host0/scsi_host/host0/scan
# echo "- - -" > /sys/devices/pci0000:00/0000:00:07.1/ata2/host1/scsi_host/host1/scan
# echo "- - -" > /sys/devices/pci0000:00/0000:00:10.0/host2/scsi_host/host2/scan

4. create new pv for the new disk

pvcreate /dev/sdb

5. Now check if the new disk is now available

ls -ltr /dev/disk/by-id/

6. You will see the following list from above command

[root@centos7vm localuser]# ls -lrt /dev/disk/by-id
total 0
lrwxrwxrwx 1 root root  9 Jul  4 15:36 lvm-pv-uuid-eN9yt9-jzpC-7Md5-9N1a-4bdP-i9Dn-jFZ1N4 -> ../../sdb
lrwxrwxrwx 1 root root  9 Jul  5  2018 ata-VMware_Virtual_IDE_CDROM_Drive_10000000000000000001 -> ../../sr0
lrwxrwxrwx 1 root root 10 Jul  5  2018 lvm-pv-uuid-GEwd0z-EDrV-hdB6-0o8M-S8eL-RzqU-gnSCIh -> ../../sda2
lrwxrwxrwx 1 root root 10 Jul  5  2018 dm-uuid-LVM-VhqLdEZRC9TbJfAu3v0q3aUREkRKgZbQl7dtNtoPOoI8yhrsKP3RFs70WdmfTP4o -> ../../dm-0
lrwxrwxrwx 1 root root 10 Jul  5  2018 dm-name-centos_centos7vm-root -> ../../dm-0
lrwxrwxrwx 1 root root 10 Jul  5  2018 dm-uuid-LVM-VhqLdEZRC9TbJfAu3v0q3aUREkRKgZbQL9essrhuujmOBF6M9VcK2LK0BUEeWlMR -> ../../dm-1
lrwxrwxrwx 1 root root 10 Jul  5  2018 dm-name-centos_centos7vm-swap -> ../../dm-1

7. One of the disk listed above points to our new disk /dev/sdb. in our above list, it's 

lvm-pv-uuid-eN9yt9-jzpC-7Md5-9N1a-4bdP-i9Dn-jFZ1N4 -> ../../sdb

8. Get your volume group of the root partition that we wish to expand

vgdisplay | grep 'VG Name'

    the output will be as shown below where "centos_centos7vm" is the volume group

[root@centos7vm localuser]# vgdisplay | grep 'VG Name'
  VG Name               centos_centos7vm

9. Let's now extend the root partition with the new disk

vgextend centos_centos7vm /dev/disk/by-id/lvm-pv-uuid-eN9yt9-jzpC-7Md5-9N1a-4bdP-i9Dn-jFZ1N4 -> ../../sdb

10. Do this command to finalize extending the root partition with the new disk. Note that the command says +20GiB but you can set the value to the size you set your new disk.

lvextend -r -L +20GiB /dev/centos_centos7vm/root

   

11. Finally, verify the change

[root@centos7vm localuser]# df -k
Filesystem                        1K-blocks     Used Available Use% Mounted on
/dev/mapper/centos_centos7vm-root  41141472 18793492  20444880  48% /
devtmpfs                            2006452        0   2006452   0% /dev
tmpfs                               2021876      156   2021720   1% /dev/shm
tmpfs                               2021876     9180   2012696   1% /run
tmpfs                               2021876        0   2021876   0% /sys/fs/cgroup
/dev/sda1                            999320   121212    809296  14% /boot
tmpfs                                404376        0    404376   0% /run/user/0
tmpfs                                404376       12    404364   1% /run/user/1001