I think that the solution mentionned in my last response is solution for you.
Did you externalize the var folder to the WEB-INF folder ?
(in other words: did you change the "default" confiruation :
in the file jahia.properties
did you change the value of the following properties:
jahiaVarDiskPath
jahiaFilesBigTextDiskPath
slideContentDiskPath
tmpContentDiskPath
jahiaFilesTemplatesDiskPath
jahiaNewTemplatesDiskPath
jahiaNewWebAppsDiskPath
jahiaSharedTemplatesDiskPath
jahiaSharedComponentsDiskPath
...
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