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Old 11-08-2008, 06:54 AM   #1
pobman
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Registered: Jun 2005
Location: Wellington, New Zealand
Distribution: Fedora 9
Posts: 31

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Unhappy DF reports wrong disk size


Hello,

I needed to move my ubuntu install from /dev/sda6 (5GB) partition to /dev/sda3 (30GB) partition. I never thought I'd use ubuntu that much so put it on a small test partition.

I have used partimage to create an image of sda6 then restored it to sda3.

When I do a df -h I get the wrong output.
I did investigate using tune2fs -m -0 /dev/sda3 regarding reserved space for /root but this did not help.

I have also tried the resize command.

Please can someone tell me how to correct this.

Code:
Filesystem            Size  Used Avail Use% Mounted on
/dev/sda3             5.1G  4.2G  672M  87% /
varrun                633M  164K  633M   1% /var/run
varlock               633M     0  633M   0% /var/lock
udev                  633M   72K  633M   1% /dev
devshm                633M   12K  633M   1% /dev/shm
lrm                   633M   39M  594M   7% /lib/modules/2.6.24-19-generic/volatile
/dev/sda3              30G  4.2G   26G  15% /sda3
gvfs-fuse-daemon      5.1G  4.2G  672M  87% /root/.gvfs
Code:
fdisk -l
/dev/sda3            4605        8453    30917092+  83  Linux
Also my grub partition is not correct, I tried to reinstall grub using.

>grub
>setup (hd0,2)

but something is still not right as it is using the /sda6 menu.lst options.

Last edited by pobman; 11-08-2008 at 06:55 AM.
 
Old 11-08-2008, 08:16 AM   #2
pixellany
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Registered: Nov 2005
Location: Annapolis, MD
Distribution: Arch/XFCE
Posts: 17,802

Rep: Reputation: 729Reputation: 729Reputation: 729Reputation: 729Reputation: 729Reputation: 729Reputation: 729
When you copy a partition at the byte level (with dd or similar tools), you are copying the entire filesystem---which will be the same size even in a newer, larger, space. I'm not sure what partition resizing tools do in such a situation. (What "resize command" did you use?)

As for installing GRUB, the shell method you show requires 3 commands:
grub
root
setup

Example, to point GRUB to drive 1, partition 3 for its files, and then install the the MBR of drive 1:
grub
root (hd0,2)
setup (hd0)

(remember that GRUB counts from zero)
 
Old 11-12-2008, 10:33 AM   #3
VinayatLQ
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Registered: Nov 2008
Posts: 2

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I have the same problem. In my case I am trying to use partimage from a 40GB HDD to a 80GB HDD.
When I do a df -h I get the following on 80GB
Code:
Filesystem                Size      Used Available Use% Mounted on
/dev/sda3                35.9G     22.5G     11.6G  66% /
where as the sfdisk -s /dev/sda3 I get the following on 80GB
Code:
#sfdisk -s /dev/sda3
77352975
Any way out of this?

Quote:
Originally Posted by pobman View Post
Hello,

I needed to move my ubuntu install from /dev/sda6 (5GB) partition to /dev/sda3 (30GB) partition. I never thought I'd use ubuntu that much so put it on a small test partition.

I have used partimage to create an image of sda6 then restored it to sda3.

When I do a df -h I get the wrong output.
I did investigate using tune2fs -m -0 /dev/sda3 regarding reserved space for /root but this did not help.

I have also tried the resize command.

Please can someone tell me how to correct this.

Code:
Filesystem            Size  Used Avail Use% Mounted on
/dev/sda3             5.1G  4.2G  672M  87% /
varrun                633M  164K  633M   1% /var/run
varlock               633M     0  633M   0% /var/lock
udev                  633M   72K  633M   1% /dev
devshm                633M   12K  633M   1% /dev/shm
lrm                   633M   39M  594M   7% /lib/modules/2.6.24-19-generic/volatile
/dev/sda3              30G  4.2G   26G  15% /sda3
gvfs-fuse-daemon      5.1G  4.2G  672M  87% /root/.gvfs
Code:
fdisk -l
/dev/sda3            4605        8453    30917092+  83  Linux
Also my grub partition is not correct, I tried to reinstall grub using.

>grub
>setup (hd0,2)

but something is still not right as it is using the /sda6 menu.lst options.
 
Old 11-12-2008, 11:57 AM   #4
VinayatLQ
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Registered: Nov 2008
Posts: 2

Rep: Reputation: 1
Smile Solved the wrong disk size issue

Finally I got it working using the resize command. Hope this works for you pobman. Mind you that my filesystem on sda3 is ext3

Here is what I did,

1. Boot you system with a CDROM/USB using any of the rescue linux or knoppix etc. I used sysresccd.
2. After boot up
Code:
umount /dev/sda3 (just in case if it is mounted)
3. do a file system check
Code:
fsck -n /dev/sda3
Output shuld be
Code:
/dev/sda3: clean, <SOMESIZE>>
4.Removed the journal from /dev/sda3, this will make it an ext2 partition
Code:
tune2fs -O ^has_journal /dev/sda3
5. run
Code:
e2fsck -f /dev/sda3
6. resize the partition (with resize2fs without options takes your max size of the disk)
Code:
resize2fs /dev/sda3
7. Next run
Code:
fsck -n /dev/sda3
8. Create journal on /dev/sda3, this will turn sda3 to ext3 partition again
Code:
tune2fs -j /dev/sda3
9. Reboot the system using your original OS (ubuntu in your case?)

Let me know if it works for you
 
Old 11-12-2008, 10:26 PM   #5
pobman
Member
 
Registered: Jun 2005
Location: Wellington, New Zealand
Distribution: Fedora 9
Posts: 31

Original Poster
Rep: Reputation: 16
Thanks a lot VinayatLQ,

In the end I decided to blow away my install and start a fresh, but I will store as I am sure it will happen again, now to try a similar thing on my ntfs partition with that bloat ware.

Thanks
 
Old 12-03-2008, 01:48 AM   #6
davehill
LQ Newbie
 
Registered: Dec 2008
Posts: 1

Rep: Reputation: 0
Thumbs up Hey - thanks!

Thanks, VinayatLQ - I had the same problem and followed your 8 steps - they worked great. df now reports the same size as gparted.

I'm planning to use the partition as a raid1 mirror with a similar HD so it was important to get it right (I'd resized it to match it to the other HD).

There was only one minor difference in what I did - the partition is new and separate from the ones in use (/, /home, etc), so I could unmount it and work on it without using a rescue CD like Knoppix.

I don't think of myself as a newbie, or of this as a newbie-type question, but I appreciate getting help from people that are more expert than me, and I'll try to do the same.
 
Old 08-29-2012, 10:58 AM   #7
schworak
LQ Newbie
 
Registered: Apr 2011
Location: Salem Oregon USA
Posts: 3

Rep: Reputation: 1
Talking

I know it has been a while since this thread has seen any action. I am only posting because this keeps coming up high in my Google searches and I found a simple solution.

I resized my RAID6 array by adding three new drives but DF kept showing the old size.

After some research I found that I simply needed to tell the OS to resize the partition to its maximum size. It took a while but it did it LIVE without unmounting the array and no data loss. As a matter of fact I was even able to write to the disk while it was being resized. I wouldn't try rebooting because that sounds down right dangerous.

It took about 3 hours (+/-) to expand my array from 3T to 6T using this command:

Code:
sudo resize2fs /dev/md9
By not specifying the size you are resizing to, the entire available space is used which is exactly what I wanted.


Last edited by schworak; 08-29-2012 at 11:13 AM.
 
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