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I wonder what testdisk would do for you as it is designed to recover lost partitions, not sure what it's like with LVM. It can be found on most Live CD's, just type: "testdisk" in a terminal, if you have FC5 installed, install it from repositories. If it does not work, you can type: "photorec" which is part of testdisk that can recover many file formats, but you'll need another 500GB as it will pull allot of data out. You have to be in the directory where you want the files recovered into before issuing the command. Foremost data carver also works similar to photorec but not so good with certain formats, very good with .jpg. Supposedly, photorec can be interupted by hitting Ctrl + C, so you can sort through the data and delete what you don't want, then resume photorec from where it left off, but I only tried that once and must have done something wrong because it started from scratch on the image file again.
A trick I use when recovering data from large drives is to use dd to make manageable sized images of the drives like 6GB at a time and use foremost or photorec, this sometimes still produces near 6GB of recovered data, with foremost, it will all be in one folder and it takes a while to view what's in that folder when there is 150,000 .jpg files in it, not all will be valid ,jpg files but you will get all the valid ones using the last .jpg entry in the configuration file. Debian is my preferred distribution for these tasks as it seems to handle the memory demands better than my other distros. You would take 6GB images across the entire drives and then offset the images by 3GB or so to catch any files that fell in between the first set of 6GB images.
If you decide you need to recover data with the methods I described, let me know and I will post my notes with the exact steps and commands used when I did .jpg recovery.
Last edited by Junior Hacker; 06-13-2007 at 02:30 AM.