DPOD's Big Data Store is located on a dedicated hard drive. Occasionally, the disk space allocated for the Store needs to be increased. Reasons for that include an increase in TPS, or a requirement to retain history for longer periods of time.

The process to increase the disk space allocated to DPOD's Store entails the two stages detailed below:

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Increase the Data Disk and File System

Physical Server

Use the server vendor's RAID management software to extend the existing RAID Disk (LUN) or add new RAID Disk (new LUN), in order to increase the data disk and file system sizes for the physical server.

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1. Verify the current size of the /data mount point:

   Code Block
   df -h /data

   The system output should resemble the following:
   

2. Verify the new disk size:

   Code Block
   fdisk -l |grep /dev/sdd

   The system output should resemble the following:
   

3. Create a new partition with the new size:

   Code Block
   fdisk /dev/sdd

   
   

   1. Press p to print the partition table and ensure there are no existing partitions. 
      
   2. Press n to create a new primary partition.
   3. Press p for primary.
   4. Press 1 for the partition number
   5. Press Enter twice
      
   6. Press t to change the system's partition ID.
   7. Type 8e to change the Hex Code of the partition for Linux LVM.
   8. Press w to write the changes to the partition table.
      

   9. Reboot the system:

      Code Block
      reboot

      
      

   10. When the system is back up, ensure the new partition is created:

       Code Block
       fdisk -l |grep /dev/sdd

        The system output should resemble  the following:
       

   11. Stop the application by running app-util.sh and selecting option 2 (stop all)

   12. Create a new LVM Physical Volume (PV):

       Code Block
       pvcreate /dev/sdd1

       
       

   13. Extend the LVM Volume Group (VG):

       Code Block
       vgextend vg_data /dev/sdd1

       
       

   14.  Extend the LVM logical volume (LV): 

       Code Block
       lvextend -l +100%FREE /dev/vg_data/lv_data

       
       

   15.  Identify the /data file system type (for CentOS 7.2 based appliances the type is xfs): 

       Code Block
       cat /etc/fstab |grep /data

        The system output should resemble the following:
       
       
       

   16.  Resize the file system. Select the correct command below for your file system type:

       Code Block
       title ext4
       resize2fs /dev/vg_data/lv_data

       
       

       Code Block
       title xfs
       xfs_growfs /dev/vg_data/lv_data

       The system output should resemble the following:
       
       
       

   17. To display the new size of the /data mount point:

       Code Block
       df -h /data

       The system output should resemble the following:
       

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Update the Store Configuration File

Starting with v1.0.4, DPOD is shipped with a script that performs all the necessary steps to update the Store configuration file.

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