There are various maintenance tasks which can be performed to maintain a healthy TYPO3 installation with the file abstraction layer.

Scheduler tasks

Two base tasks provided by the Scheduler are related to the file abstraction layer.

File abstraction layer: Update storage index

This task goes through a storage and makes sures that every file is properly indexed. When files are manipulated only via the TYPO3 backend, they are always indexed. However if files get added via other means (e.g. FTP) or if some storages are based on drivers accessing remote systems, it is crucial to run this task regularly so that the TYPO3 installation knows about all existing files in order to make them available to users.

This task is defined per storage.

File abstraction layer: Extract metadata in storage

This task goes through all files in a storage and updates their metadata. Again this is especially important when files can be manipulated by other means or actually reside on external systems.

This task is defined per storage.

Processed files

If you change some graphics-related settings, it may be necessary to force a regeneration of all processed files. This can be achieved by deleting all existing processed files in Admin Tools > Maintenance > Remove Temporary Assets.


Removing all processed files in the Maintenance Tool

Here you can choose to delete all files in fileadmin/_processed_/

This cleanup is also good if processed files have accumulated for a long time. Many of them may then be obsolete.


If you delete processed files, you should flush the page cache immediately afterwards. If pages are cached and the page uses processed images, these will not be regenerated on the fly when a page is loaded. Ideally, make sure the removal of the processed files and flushing of page cache is one atomic operation which is performed as quickly as possible.

After flushing page cache, it is a good idea to warmup the page cache. Generating the pages for the first time may take longer than usual because the processed files need to be regenerated. There is currently no Core functionality to warmup the page cache for all pages, but there are a number of extensions which provide this functionality. Alternatively, one can use the sitemap and a tool such as wget for this.

Also, deleting processed files while editors are active is not ideal. Preferably, lock the TYPO3 backend before you remove the processed files.