[ale] Questionable output from fdisk -l

Brian Pitts brian at polibyte.com
Tue Sep 25 14:35:53 EDT 2007


Scott Castaline wrote:
> I've noticed when I do a fdisk -l, I'm getting invalid partition table 
> errors as follows:
> 
> Disk /dev/dm-7: 107.3 GB, 107374182400 bytes
> 255 heads, 63 sectors/track, 13054 cylinders
> Units = cylinders of 16065 * 512 = 8225280 bytes
> 
> Disk /dev/dm-7 doesn't contain a valid partition table
> 
> This goes through to dm-15, with the only difference being the 
> capacity/geometry listed for each. I also noticed in /dev that there are 
> block device files for dm-7 to dm-15. What do these represent? I 
> physically have 4 HDDs:
> 
> #1 80 GB PATA HDA  (Fedora7 refers to it as sda)
> #2 250 GB PATA HDB (Fedora7 refers to it as sdb)
> #3 160 GB SATA SDA (Fedora7 refers to it as sdc)
> #4 500 GB SATA SDB (Fedora7 refers to it as sdd)
> 
> I am using LVM on all 4 drives. The 1st one is my main drive for FC6 and 
> the 2nd one is the main drive for F7, while both SATA drives are used in 
> both FC6 & F7. I haven't tried it yet on FC6 to see if it happens there 
> too, yet.

I believe those are the device mapper nodes for your logical volumes, 
which shouldn't have partition tables. These are normally linked into a 
directory that represents your volume group, like in this chart 
http://www.linuxdevcenter.com/linux/2006/04/27/graphics/lvm-lg.gif

-Brian



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