Help my site directory has disappeared   

Ok something weird on one of my portal sites in a share services farm
(2003) i have discovered that the site directory has gone. I dont know
if someone deleted it or something else. Any ideas how I can either
recreate it or if I have to restore how do I restore just the site
directory not the whole portal.

Thanks

date: Wed, 27 Aug 2008 05:09:37 -0700 (PDT)   author:   claire