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    <p>Generated data like image thumbnails is often stored in a (comparatively) temporary filesystem location, and <a href="http://sorl-thumbnail.readthedocs.org/en/latest/operation.html" rel="nofollow noreferrer">How sorl-thumbnail operates</a> suggest the same:</p> <blockquote> <p>When you use the thumbnail template tag sorl-thumbnail looks up the thumbnail in a Key Value Store. The key for a thumbnail is generated from its filename and storage. [...] <strong>It is worth noting that sorl-thumbnail does not check if source or thumbnail exists</strong> if the thumbnail key is found in the Key Value Store.</p> <p><strong>Note:</strong> This means that <strong>if you change or delete a source file or delete the thumbnail, sorl-thumbnail will still fetch from the Key Value Store</strong>. Therefore it is important that if you delete or change a source or thumbnail file notify the Key Value Store.</p> <p><em>[emphasis mine]</em></p> </blockquote> <p>Now, <a href="http://aws.amazon.com/ec2/" rel="nofollow noreferrer">Amazon EC2</a> instances usually feature two distinct storage types, namely the persistent <a href="http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/AmazonEBS.html" rel="nofollow noreferrer">Amazon Elastic Block Store (Amazon EBS)</a> volumes, which are copied when cloning an instance, and also the <a href="http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/InstanceStorage.html" rel="nofollow noreferrer">Amazon EC2 Instance Store</a> volumes (usually referred to as <em>ephemeral storage</em>), which are lost when cloning an instance; see my answer to <a href="https://stackoverflow.com/a/10751034/45773">how to take backup of aws ec2 instance/ephemeral storage?</a> for more on this difference/problem.</p> <p>So presumably your thumbnails have been stored on the ephemeral volume and would need to be generated now accordingly.</p>
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    1. COI actually created this EC2 instance using the ec2-bundle-vol AMI Tool command. I then uploaded the bundle to an S3 bucket using the ec2-upload-bundle command and used this bucket when registering the AMI for the secondary staging server. Therefore, it's my understanding that it is an exact copy of the working staging instance at the time of issuing ec2-bundle-vol command.
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    2. COIt also might be worth mentioning that I am using Redis for caching and modified the settings_local.py on the new secondary staging server to point to a different Redis key-value store than the one used by the primary staging server.
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