LVM question. Missing about 11GB of Space..

[Michael D. Setzer II]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

In doing a backup of a 250GB drive, I was surprised to have a 
compressed image that was larger than the used space. In the past, 
I've compressed an 80GB drive with 3 OS's, and get a 14GB image. 
This is a 250GB drive with only 1 OS, and it is producing an 18GB 
image. All free space is zeroed out.  In doing some research, it 
appears that about 5% of the LVM partition is being used in some 
fashion that I am not aware of. 

The drive shows the volume size as 229GB with 12GB uses, and 
206GB Free. That leaves about 11 - 12 GB missing. 

Whatever is in this 5% of the drive doesn't appear to compress very 
well with either lzop or gzip. With lzop the image is about 18GB and 
16GB with gzip, but lzop only takes about 2 hours, whereas gzip 
takes about 3 1/2 hours. The image only seems to be runing fine 
until it gets to the end were this 5% seems to be, and it grows 
rapidly. 

Any info on what this 5% is. I'm using g4l, which uses dd to copy the 
raw partition information, and uses lzop or gzip compression. I was 
thinking it might be some kind of swap, but why it would be 5% of 
the disk size, as compared to the amount of ram. 

Thanks.



+----------------------------------------------------------+
  Michael D. Setzer II -  Computer Science Instructor      
  Guam Community College  Computer Center                  
  mailto:mikes at kuentos.guam.net                            
  mailto:msetzerii at gmail.com
  http://www.guam.net/home/mikes
  Guam - Where America's Day Begins                        
+----------------------------------------------------------+

http://setiathome.berkeley.edu
Number of Seti Units Returned:  18,388
Processing time:  32 years,  71 days,  5 hours, 36 minutes
(Total Hours: 282,030)


-----BEGIN PGP SIGNATURE-----
Version: PGP 6.5.8 -- QDPGP 2.61c
Comment: http://community.wow.net/grt/qdpgp.html

iQA/AwUBQ2MGVCzGQcr/2AKZEQJwSACfc2ZHGgaugdmkZvqPXjWfwIL73vgAn0l+
Er1X39Mbmxd68f5JmWToTQKa
=sxlC
-----END PGP SIGNATURE-----