The Opensolr service, runs on a set of resources:

• Indexes - standalone Opensolr indexes residing in various regions worldwide.
• Clusters - resilient cluster of servers working as an Opensolr Index, which offers many other benefits, as described here.
• Disk space - the disk space used by each one of your Opensolr Indexes or Clusters.
• Bandwidth - the outgoing data traffic going from the Opensolr infrastructure, to your website or application.

When do you need to upgrade your plan?
You generally need to upgrade, when your Free Trial is over, or, you ran out of either one of the above resources.

For example, let's say you have 1 Opensolr Index, and that index ran out of disk space.

1. Check your index disk space consumption:
   
   1. Go to your Opensolr Control Panel - Index List.
   2. Click on your index name:
      
   3. Check the disk space in your Opensolr Index Control Panel:
      
   4. Click Solr Admin to get fresh disk usage (just to make sure):
      
      
   5. Go to the Pricing Page which is reachable throughout the website using the top Pricing link, or follow the Billing section in your Opensolr Index Control Panel:
      
      
      
   6. You will there see a set of pre-defined packages, however you will always have to customize your package, in order to fit your needs.
      
      Next, you will get to the customization area, where you can select more disk space, bandwidth, indexes, clusters, or any other resource.
      
2. Do the same for any other resource, including when you need more indexes, you would simply select more indexes.
   All upgrades and downgrades are pro-rated so you always only pay for what you use.