Can you cut and paste the fdisk -l output into an email? It can tell
you a lot about what the drives really amount to.

Are you running it as a RAID with checksum or simply striping? Your
numbers suggest something like RAID 6.

This is the system I am currently prepping to use as a name server,
firewall, and email tool for a two person multi-computer (and a lot
of "gadgets") network here.

Disk /dev/sda: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00007e83

    Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1          64      512000   83  Linux
Partition 1 does not end on cylinder boundary.
/dev/sda2              64       60802   487873536   8e  Linux LVM

The header portion is REALLY interesting. It's a 500 gigabyte
drive. But, it's only 488386584 1k blocks, 476940 1 meg blocks, or
465 1 gigabyte blocks when speaking of 1024 byte entities rather
than 1000 byte entities.

Your 12 1 terabyte disks striped array is only 10.91 TeraBytes
in computer speak - 1024 per K rather than 1000 per k. Could
that explain your discrepancy?

{^_^}   Joanne (First explained this to others in 1986. IMAO
        disks should be advertised both ways for clarity.)

On 2011/06/05 22:11, Sunil M. Dogra wrote:
> Hi,
>
> Ans: / = ~45GB
> /boot =~2GB
> /swap =~16GB
>
>
> I have another question
>
> why gparted, fdisk -l, system-config-lvm are giving different outputs for
> 12TB but giving the same output for 500GB
>
> With Regards
> sunil
>
>
> On Mon, Jun 6, 2011 at 3:28 AM, jdow <[log in to unmask]
> <mailto:[log in to unmask]>> wrote:
>
>     On 2011/06/03 06:47, Alec T. Habig wrote:
>
>         James Holland writes:
>
>             Don't know why this is... But check how big your other partitions
>             are using gparted.
>
>
>         Could it be that he's comparing the "1TB" drives he's bought (which are
>         marketed as decimal 1x10^12 bytes) with the expected (binary) 2^40
>         bytes?
>
>         That's a 10% reduction in perceived space.  If the disk format has also
>         reserved the traditional (and now obsolete) 10% for root use only, then
>         suddenly we're 2.5 TB down from what one would naively expect after
>         clicking on "Newegg, please send me 12 terabyte drives".
>
>         gparted will show the whole capacity (ignoring this root reserve), but
>         "df" won't.
>
>
>     How big are /, /boot, and /swap?
>
>
>
>
>
>
>
>     (I'm old fashioned and silly, I like "/dev/fdisk -l /dev/sda >foo" as
>     a way of exporting the actual partitioning. I am not sure fdisk would
>     be happy with 12 TB, though. But showing us the actual partitioning
>     might be a good idea.)
>
>     {o.o}   Joanne. (Imprinted on the old tools back in about '88 on of
>            all things "Amiga Unix.")
>
>