Test: For multisite configurations, the configuration file is located in a

Prior to upgrading, you should ensure that:

 * Your system meets or exceeds Drupal's minimum requirements as shown at
   http://drupal.org/requirements.
 * You have a backup of all your relevant data (#1).
 * Custom and contributed modules have been checked for compatibility (#11).
 * Custom and contributed themes have been checked for compatibility (#11).
 * You have read through this entire document.

Let's begin!

1.  Backup your database and Drupal directory - especially your "sites"
    directory which contains your configuration file and added modules and
    themes, any contributed or custom modules in your "modules" directory,
    and your "files" directory which contains uploaded files. If other files
    have modifications, such as .htaccess or robots.txt, those should be
    backed up as well.

    Note: for a single site setup, the configuration file is the "settings.php"
    file located at sites/default/settings.php. The default.settings.php file
    contains a clean copy for restoration purposes, if required.

    For multisite configurations, the configuration file is located in a
    structure like the following:

      sites/default/settings.php
      sites/example.com/settings.php
      sites/sub.example.com/settings.php
      sites/sub.example.com.path/settings.php

    More information on multisite configuration is located in INSTALL.txt.

2.  If possible, log on as the user with user ID 1, which is the first account
    created and the main administrator account. User ID 1 will be able to
    automatically access update.php in step #10. There are special instructions
    in step #10 if you are unable to log on as user ID 1. Do not close your
    browser until the final step is complete.

3.  Place the site in "Off-line" mode, to let the database updates run without
    interruption and avoid displaying errors to end users of the site. This
    option is at http://www.example.com/?q=admin/settings/site-maintenance
    (replace www.example.com with your installation's domain name and path).