Mailinglist Archive: opensuse (1264 mails)

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Re: [opensuse] file system usage?
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).

I looked after how to check it:

blockdev --getbsz /dev/sdc7
4096

blockdev --getbsz /dev/sdc8
4096

Yes, they have the same block size


I formatted both partitions as ext4 using Leap 42.2 yast2
partition tool with its default options. I installed Leap
42.2 onto partition 7. Partition 6 also has Leap 42.2 installed
earlier. I booted part6 Leap 42.2, mounted partitions 7 and 8
(as /mnt1 and /mnt2) and rsynced everything from partition 7 to 8:

rsync -a /mnt1/ /mnt2

Interestingly the file systems usage is not the same for
the two partitions (part7 is mnt1, part8 is mnt2):


df -h
Filesystem Size Used Avail Use% Mounted on

/dev/sdc7 28G 6.1G 21G 24% /mnt1
/dev/sdc8 28G 6.7G 20G 26% /mnt2

Why is this difference?

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?

Thanks,

Istvan


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