I am using Alfresco 5.0 and upload about 400 PDF files (about 2MB each) to it per day.
Recently I found that some of files can be uploaded successfully within 20 seconds; however, some of them can be uploaded to Alfresco, but Alfresco does not create indexes for them.
By using the "Repository Browser", I can find those files being uploaded to the "Repository" folder, but they are not searchable by the "Repository" search function.