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We're all ready to launch the final version of the new emonSD Emoncms Raspberry Pi image. However there is one little issue I would really like to fix, I've been struggling with this one for a few weeks now and making no progress :-/ 

The Emoncms Backup  module allows easy data migration from one emonBase / emonPi Emoncms install to another via the web-interface. Data is compressed into a tar.gz that can then be downloaded via web-browser and then uploaded via-browser into the new emonBase/ emonPi Emoncms. When uploading via php upload any tar.gz file larger than 21Mb fails, all smaller files 21Mb and below work fine. 

I have set in php.ini (attached) 

post_max_size = 200M
upload_max_filesize = 200M

​The php upload code we are using is:

 if ($route->action == "upload") {
        // These need to be set in php.ini
        // ini_set('upload_max_filesize', '200M');
        // ini_set('post_max_size', '200M');
        $uploadOk = 1;
        $target_path = "/home/pi/data/uploads/";
        $target_path = $target_path . basename( $_FILES['file']['name']);
        
        $imageFileType = pathinfo($target_path,PATHINFO_EXTENSION);
        
        // Allow certain file formats
        if($imageFileType != "gz")
        {
            $result="Sorry, only .tar.gz files are allowed.";
            $uploadOk = 0;
        }
        if ((move_uploaded_file($_FILES['file']['tmp_name'], $target_path)) && ($uploadOk == 1)) {
            $fh = @fopen($import_flag,"w");
            if (!$fh) {
                $result = "ERROR: Can't write the flag $import_flag.";
            } else {
                fwrite($fh,"$import_script>$import_logfile");
                $result = "Backup flag set";
            }
            @fclose($fh);
            header('Location: '.$path.'backup');
        } else {
            $result = "Sorry, there was an error uploading the file";
        }
    }
    return array('content'=>$result);
}

https://github.com/emoncms/backup/blob/master/backup/backup_controller.p...

Any idea why PHP upload upload could be failing at 21Mb? I have attached output of php info. 

There is plenty of space left on the disk in the ~/data partition