.. _storage-migration:

Migrate Data to Another Disk
===========================================

High disk load may lead to delays in event arrivals. In severe cases, it might result in complete inoperability of FindFace Multi. One of the means for reducing the disk load is to migrate the FindFace Multi data storages to another disk.

.. rubric:: In this section:

.. contents::
   :local:

.. _prepare-disk:

Prepare Disk
--------------------

To prepare a disk for the data migration, do the following:

#. Create a new mount point (``/mnt/ffdata`` in our example).

   .. code::

      sudo mkdir /mnt/ffdata

#. Create a partition.

   .. code::

      sudo parted /dev/sdb
      mklabel gpt
      mkpart primary ext4 1MiB 100%
      q
      sudo mkfs.ext4 /dev/sdb1

#. Learn the UUID of the partition (``sdb1`` in our example).

   .. code::

      sudo blkid | grep sdb1
      /dev/sdb1: LABEL="data" UUID="0638ebe0-853e-43ea-8f35-bfae305695d1" TYPE="ext4" PARTUUID="8cebaacc-77d7-4757-b4c6-14147e92646c"

#. Add the partition to fstab to make it automatically mount on booting. 

   .. code::

      sudo vi /etc/fstab 
      ------------
      #DATA mount
      UUID=0638ebe0-853e-43ea-8f35-bfae305695d1 /mnt/ffdata/    ext4    auto,user,rw     0       2
      -------------

#. Mount all the filesystems.

   .. code::

      sudo mount -a


Migrate Photo and Video Storage
---------------------------------

To migrate the FindFace Multi photo and video storage, do the following:


#. Inside the mount point, create a directory to store photos and recorded video chunks (if the Video Recorder was deployed).

   .. code::

      sudo mkdir /mnt/ffdata/ffupload -p

#. Mount the created directory (``/mnt/ffdata/ffupload`` in the example) into the ``findface-multi-findface-upload-1`` container. To do so, open the ``/opt/findface-multi/docker-compose.yaml`` configuration file and list it in the volumes of the ``findface-upload`` section instead of the default ``/opt/findface-multi/data/findface-upload`` directory.

   .. code::

      sudo vi /opt/findface-multi/docker-compose.yaml

      findface-upload:
        ...
        volumes: ['./configs/findface-upload/40-ffupload.sh:/docker-entrypoint.d/40-ffupload.sh:ro',
          '/mnt/ffdata/ffupload:/var/lib/ffupload']

#. Rebuild all FindFace Multi containers.

   .. code::

      cd /opt/findface-multi

      sudo docker-compose down

      sudo docker-compose up -d


Migrate Main Database (PostgreSQL)
------------------------------------

To migrate the PostgreSQL database, do the following:

#. Inside the mount point, create a directory to store the PostgreSQL data.

   .. code::

      sudo mkdir /mnt/ffdata/postresql -p

#. Mount the created directory (``/mnt/ffdata/postresql`` in the example) into the ``findface-multi-postgresql-1`` container. To do so, open the ``/opt/findface-multi/docker-compose.yaml`` configuration file and list it in the volumes of the ``postgresql`` section instead of the default ``/opt/findface-multi/data/postgresql`` directory.

   .. code::

      sudo vi /opt/findface-multi/docker-compose.yaml

      postgresql:
      ...
        volumes: ['./configs/postgresql/40-init.sql:/docker-entrypoint-initdb.d/40-init.sql:ro',
          '/mnt/ffdata/postgresql:/bitnami/postgresql/data']

#. Rebuild all FindFace Multi containers.

   .. code::

      cd /opt/findface-multi

      sudo docker-compose down

      sudo docker-compose up -d