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Re: dd question, what am I doing wrong? [SOLVED]



On 12/04/2009 02:37 PM, Daniel B. Thurman wrote:
> On 12/04/2009 01:56 PM, Tom H wrote:
>   
>>> I am copying a disk/partition to another disk/partition
>>> using dd, with the following:
>>>
>>> BEFORE:
>>> Disk1: partition#1: psize=100G, size=97.65G, used=91.23G, unused=6.42G
>>> Disk2: partition#1: psize=250G, size=244.14G (newly formatted)
>>>
>>> I did a dd if=/dev/sda1 of=/dev/sdb1
>>>
>>> AFTER:
>>> Disk1: partition#1: psize=100G, size=97.65G, used=91.23G, unused=6.42G
>>> Disk2: partition#1: psize=250G, size=244.14G, used=237.72G, unused=6.42G
>>>
>>> WTF...
>>>
>>> Then I:
>>> 1) mount /dev/sdb1 /mnt
>>> 2) cd /mnt/b
>>> 3) df -h .
>>> Filesystem            Size  Used Avail Use% Mounted on
>>> /dev/sdb1              97G   90G  1.6G  99% /mnt/b
>>> 4) umount /mnt
>>>
>>> 5) mount /dev/sdb1 /mnt
>>> 6) cd /mnt
>>> 7) df -h .
>>> Filesystem            Size  Used Avail Use% Mounted on
>>> /dev/sda1              97G   90G  1.6G  99% /mnt/b
>>> 8) Umount /mnt
>>>
>>> Hmm... this is not what I expected... I had assumed that somehow
>>> the free disk space would somehow be reclaimed...
>>>
>>> What am I doing wrong here and how do I get around this?
>>>     
>>>       
>> You have to resize Disk2 to 250Gb with resize2fs or parted.
>>
>>   
>>     
> The answer is, you have to rezise after dd and there are two ways
>
> 1) e2fsck -f /dev/sdb; resize2fs /dev/sdb
> 2) Use gparted: a) shrink it down minimally, then regrow
>
> Step 1 is faster, or so it seems
>   
Dang...  step 1 should be: /dev/sdbX where X is the partition desired.


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