Mailinglist Archive: opensuse (1264 mails)

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Re: [opensuse] file system usage?
On Tue, 13 Jun 2017 22:46:47 +0200, Carlos E. R. wrote:
On 2017-06-13 15:44, Istvan Gabor wrote:
On Tue, 13 Jun 2017 15:18:56 +0200, Carlos E. R. wrote:
On 2017-06-13 15:14, Istvan Gabor wrote:
Hello:

Shortly:
I have to identical partitions I formatted with the same tool.
I copied everything from one partition to the other still
the file system usage is different. Why?

Longer version:

I have two extended partitions on the same hard disks.
They have identical sizes and block numbers.
fdisk report is:

Device Boot Start End Blocks Id System
/dev/sdc7 399155791 457744782 29294496 83 Linux
/dev/sdc8 457744846 516333837 29294496 83 Linux

Are they both the same sector size? New disks sectors are 4 KiB.

Do you mean block size?
I suppose yes, because I formatted the partitions using the same tool with
the same options (as far as I know).

Format doesn't matter, it is a hardware issue. Example:

Telcontar:~ # fdisk -l /dev/sda
Disk /dev/sda: 1.8 TiB, 2000398934016 bytes, 3907029168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes

I do have both partitions on the same hardware.
On the same physical hard drive, not two identical
drives.

Do you have sparse files, perhaps?

I don't exactly know what a spare file is.
How can I find out if I have any?

Sparse, not spare :-)

Sorry, typo.

Files with holes. You can create a gigabyte file and only one megabyte
block in the middle has data, the rest doesn't exist. Not that the rest
(the holes) contain zeroes, but no: it contains nothing, it doesn't
exist on disk.

Such a file would use only one megabyte of disk space.


Who uses that? Well, some download utilities: they populate the regions
of the file that they manage to download, and the rest are holes,
conserving disk space.

They are seldom used (I have only seen them with a p2p utility), and
right now, I do not remember how to find out if they exist on a partition.

I guess some torrent client use this, but I wasn't sure that
is was the same thing.

Thanks,

Istvan

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