We are using NFS for users data and now faced with issue. litespeed keeps files locked for a longer period, even correspondent php process is ended. It means, f.ex., you can not update Wordpress correctly. During update process WP deleting some files in folders. But it fails because of .nfs files present and locked. It is well known NFS feature called silly rename -http://nfs.sourceforge.net/ . So it looks like wp-content/themes/twentytwelve/js/.nfs0000000090a508c80000020f can not be removed. And yes, file is locked by web server process for some time. lsof | grep .nfs0000000090a508c80000020f litespeed 29471 httpd mem REG 0,23 863 2426734792 ..../wp-content/themes/twentytwelve/js/.nfs0000000090a508c80000020f (...:/mnt/data/.../home) even lsphp process is done and nobody else access web site. from WP point of view you have a broken site, because update process fails in theme deleting stage and you have no default theme at all! Is it possible to avoid web sites files locking by litespeed process?