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 <j...@earthlink.net
<mailto:j...@earthlink.net>> 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.")
