Steps to create a Block Volume & attach to a Compute Instance

6.1_Steps to create a Block Volume

Step1: Navigate to Burger Menu --> Storage --> Block Volumes --> Create Block Volume

Step2: Fill in the details - Block Volume Name, Compartment Name, Availability zone etc and click on "Create Block Volume".

Note: Please ensure to create the Block volume in the same Compartment and Availability zone as the compute instance, so that it can be added to it.

Step3: New block volume has been created and you can view and find it available.

6.2_Attaching a Block Volume to a Compute Instance

Step1: Navigate Storage-->Block Volumes-->Select the newly created Block Volume-->Click on the Attached Instances(Left hand side)-->Attach to a instance-->

Step2: Choose Attachment and Access type and select instance name and the path. Click Attach.

Step3: Reconfirm the instance has attached volume. Navigate to Burger Menu --> Compute --> Instances --> Click on the Instance where the Block Volume was attached --> Go to "Attached Block Volumes" -->

The added Block volume can be seen

6.3_Reflecting the Block Volume in server

Step1: After the Block Volume had been attached, Login to the server through Putty, in order to update the new volume in the server.

Step2: You will login through opc user which is the instance user. For performing to root user, we need to use the sudo command.

sudo su - root

Step3: Run lsblk command to check the existing volumes in the server.

lsblk

Step4: Go to the attached block volumes and then click on the 3 dots at the end.

Step5: Click ISCSI commands and information

Step6: Copy the connect command

Step7: Paste in the putty server.

Step8: Run again lsblk to check the BV and one new volume is created.

lsblk

Step9: Run df –h command to check if this volume is showing or not.

df -h

As the volume is still not showing, we need to mount this volume to be ready to be used.

6.4_Create a New Partition

Step1: Format the disk and type m for help.

fdisk /dev/sdb

Step2: Type “n” to create a new partition. Select default.

Step3: Type w in help to write the partition and then run lsblk to check the partition.

6.5_Create a Physical Volume

Step1:Run pvcreate command to create physical volume.

pvcreate /dev/sdb1

Step2: Run pvdisplay to see the volume.

pvdisplay /dev/sdb1

6.5_Create a Volume Group

Step1: Create a volume group by running vgcreate.

vgcreate vg_u01 /dev/sdb1

vgdisplay vg_u01

Run “vgdisplay vg_u01” to display the volume group created and to see the Number of Physical Extent.

6.6_Create a logical volume by lvcreate and map it to our volume group

Step1: Creating Logical Volume & Mapping it Volume group

lvcreate -l 12799 -n lv_u01 vg_u01

ls -l /dev/mapper/vg_u01-lv_u01

Logical volume is created inside our volume group .

6.7_Formatting this logical volume using a file system

Step1: Running the command mkfs using ext4 file system.

mkfs.ext4 /dev/mapper/vg_u01-lv_u01

6.8_Creating a Directory to mount the logical volume

Step1: Making directory and mounting it.

mkdir /u01

mount -t ext4  /dev/mapper/vg_u01-lv_u01  /u01

Step2: After mounting run df -h to see that the logical volume is mounted.

6.9_Mount the volume permanently in /etc/fstab or else it will get removed after the server reboots.

Step1: Go to etc folder

cd /etc

Step2: Edit the fstab file and add the line below in it.

vi fstab

/dev/mapper/vg_u01-lv_u01  /u01  ext4  defaults,_netdev,nofail 0 2

Step3: After adding this line in /etc/fstab, we have to run mount –a command.

mount -a

Step4: Run the command "systemctl daemon-reload" to mount this volume premanently.

systemctl daemon-reload

Step5: See Again to confirm by using df -h