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  • Owen Blacker 19 posts 92 karma points
    Jun 08, 2020 @ 09:16
    Owen Blacker

    Huge cache folder inside App_Data

    We're running Umbraco v7.14, and our App_Data cache just keeps growing up use all the space on the drive.

    I'm using a script to delete all the files within and they're all image files (mainly .jpg) but in the half-hour the script has been running so far, it's deleted 40 GB of files. By comparison, the whole /media folder for that site is just over 2 GB.

    I thought it was ImageProcessor maybe taking up lots of space, as there are several threads about that on these Forums (examples: 1, 2, 3) but I updated to the latest versions a couple of weeks or so ago (ImageProcessor.dll v2.9.0.207 and ImageProcessor.Web.dll v4.12.0.206, released in April 2020) and that doesn't seem to have made any difference.

    Anyone got any ideas on how I could debug and solve this?


    Edited to add: It was over 170 GB of space freed up by emptying the cache.

  • Owen Blacker 19 posts 92 karma points
    Jun 08, 2020 @ 11:49
    Owen Blacker

    I've just spotted that the IIS_IUSRs group had Modify access but not Full Control to App_Data, which might be the answer. I've fixed that and will see if it makes the problem go away…

  • Alex Skrypnyk 6132 posts 23951 karma points MVP 7x admin c-trib
    Jun 08, 2020 @ 21:03
    Alex Skrypnyk

    Hi Owen,

    It looks like really an issue with ImageProcessor, can you check /config/imageprocessor config files? Maybe you have so many image crops on pages?

    Thanks, Alex

  • Thomas Rydeen Skyldahl 47 posts 229 karma points
    Jun 09, 2020 @ 07:48
    Thomas Rydeen Skyldahl

    Do you use dynamic sizing of images based on screen/browser window sizes?

    Because that can give a lot of different sizes, of the same image.

    it can also be somebody trying to bring down your server by brute-force generating lots of different image sizes, or if you enabled upscaling they can request bigger sizes ex: 5000x5000 images.

    if the last is the case you can switch to only allowing templates to be used in the Image Processor configuration.

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