> Thanks a lot ,the problem disappeared . > > ButI have two questions > 1.IfI want to use mod_glusterfs ,what should do? This might be related to the specific version of apache. Can you give more details about the exact apache version (and devel package version, if different) which are installed? > 2.Is the mod_glusterfs necessary for web service ? mod_glusterfs lets you export glusterfs by embedding the filesystem inside apache address space making it very efficient. Alternatively, you can export a regular fuse based mountpoint as a document root as well. Avati