Step 4: Migrate Existing Data

Now, we'll move our existing data from Practical Session 1: Administration to our new ZFS folders.

Sync Data

BASH

root@xnat-12:~# rsync -ah --stats /data.old/ /data
root@xnat-12:~# rsync -ah --stats /var/lib/postgresql/9.5/main.old/ /data/postgres/9.5

Double-check your slashes

Rsync is very sensitive to trailing slashes. Make sure you have the slashes exactly as in the example.

Change Postgres Data Location

Edit the postgresql.conf to change the data location

BASH

# nano /etc/postgresql/9.5/main/postgresql.conf

Change the line:

data_directory = '/var/lib/postgresql/9.5/main'         # use data in another directory

to:

data_directory = '/data/postgres/9.5'         # use data in another directory

Restart Tomcat and PostgreSQL

BASH

root@xnat-12:~# service postgresql start
 * Starting PostgreSQL 9.5 database server                       [ OK ]
root@xnat-12:~# service tomcat7 start
 * Starting Tomcat servlet engine tomcat7                        [ OK ]

Step 4 Complete

Change Postgres Data Location

Restart Tomcat and PostgreSQL

Continue to Part 2: Automating ZFS Project Mounts for XNAT