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DPOD's Big Data Store is located on a dedicated mount point. 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. Follow the steps below to increase the Store space.

Note: It is possible to extend You may choose between extending the existing data disk (option 1), or add an adding additional disks (option 2).
Since DPOD uses fdisk utility supports disks up to 2TB each, in order to increase the Store space above 2TB, add additional disks (option 2) instead of extending a single for creating partitions in the data disk, it only supports extending the existing data disk (option 1) . Choose the option below that is suitable for your environment and requirementsup to 2TB. However, additional disks (option 2) can be larger than 2TB.

Option 1: Extending the Existing Data Disk

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

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   df -h /data

   The system output should resemble the following:
   
   
   

2. Verify the new disk size:

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   fdisk -l | grep /dev/sdc

   The system output should resemble the following:

   
   
   

3. Use fdisk to create a new partition for the new size:

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   fdisk /dev/sdc

   
   

   1. Press p to print the partition table to identify the number of partitions:
      
      If this is the first time the disk is extended, you should only see sdc1. If this is a subsequent extension - you will see additional sdcX listed (e.g. sdc2 for the second extension).
   2. Press n to create a new primary partition.
   3. Press p for primary.
   4. When the system prompts for a partition number, enter the next number depending on the output of the partition table print.
      If this is the first extension and you see only one row of output - enter 2. If this is the second disk extension then the partition number will be 3, and so on.
   5. Press Enter twice
      
   6. Press t to change the system's partition ID.
   7. Press 2 to select the newly created partition (Remember: if this is a subsequent disk extension - the number will be 3 or higher).
   8. Type 8e to change the Hex Code of the partition for Linux LVM.

   9. Press w to write the changes to the partition table.
      
      
      
      

      Note
      The following warning is valid, the system reboot will fix the issue: “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)”

      
      

4. Reboot the system:
   

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   reboot

   
   

5. When the system is available again, ensure the new partition is available:

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   fdisk -l | grep /dev/sdc

   The system output should resemble the following (note the new sdcX added):
   
   
   

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

7. Create a new LVM Physical Volume (PV)Configure the new partition:

   Note
   If the new partition is not sdc2, substitute sdc2 for the right qualifier in all the following commands

   
   

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   pvcreate /dev/sdc2

   Extend the LVM Volume Group (VG):

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   vgextend vg_data /dev/sdc2

   Extend the LVM Logical Volume (LV):

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

   
   

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

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   cat /etc/fstab | grep /data

   The system output should resemble the following:
   
   
   

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

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   resize2fs /dev/vg_data/lv_data

   
   

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   xfs_growfs /dev/vg_data/lv_data

   
   

   The system output should resemble the following:
   
   
   

10. Display the new size of the /data mount point:

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    df -h /data

    
    

11. Update the Store configuration file (see below).

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

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   df -h /data

   The system output should resemble the following:
   

2. Verify Identify the new disk size:

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   fdisklsblk -l[ |Note: grep /dev/sdd

   The system output should resemble the following:
   Image Removed

   Use fdisk to create a new partition for the new size:

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   fdisk /dev/sdd

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

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reboot

When the system is available again, ensure the new partition is created:

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fdisk -l | grep /dev/sdd

 The system output should resemble  the following:
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Example output below is filtered to show only sdd disk information, but should include many more entries of sda, sdb and sdc disks ] NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sdd 8:32 0 200G 0 disk




10. Stop the application by running app-util.sh and selecting option 2 (stop all)
    Create a new LVM Physical Volume (PV):
    

11. Execute the following commands. Replace the name of data disk if it is different in your environment.

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    pvcreate -ff /dev/sdd1

    Extend the LVM Volume Group (VG):

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    sdd vgextend vg_data /dev/sdd1

    Extend the LVM logical volume (LV):

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    sdd lvextend -l +100%FREE /dev/vg_data/lv_data

    
    

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

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    cat /etc/fstab | grep /data

     The system output should resemble the following:
    
    
    

    
    

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

    Code Block
    language bash theme RDark title For ext4
    resize2fs /dev/vg_data/lv_data

    
    

    Code Block
    language bash theme RDark title For xfs
    xfs_growfs /dev/vg_data/lv_data

    
    The system output should resemble the following:
    
    
    

14. Display the new size of the /data mount point:

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    df -h /data

    The system output should resemble the following:
    
    
    

15. Update the Store configuration file (see below).

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