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Shell Programming and Scripting

dd command issue

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# 1  
Old 03-22-2010
Error dd command issue
Code:
dd if=/dev/zero of=/var/images/abc.img bs=1M count=0 seek=2097152 
dd: truncating at 2199023255552 bytes in output file `/var/images/abc.img': File too large 


The dd commad fails here saying its truncating if I try same command with less value for seek it works 
dd if=/dev/zero of=/var/images/abc.img bs=1M count=0 seek=2088960 
0+0 records in 
0+0 records out 
0 bytes (0 B) copied, 2.1e-05 seconds, 0.0 kB/s

Whats the reason behind this and how can this be solved ?
Note that there is 3.9T available on disk for the above commands to execute.
Last edited by pludi; 03-23-2010 at 03:08 AM.. Reason: code tags, please...
# 2  
Old 03-22-2010
Looks like either /var/images is not mounted with largefiles enabled or that the dd(1m) command is not largefiles aware.

See also:
https://www.unix.com/unix-dummies-que...b-problem.html
# 3  
Old 03-24-2010
TonyFullerMalv is in the right area.

Note that 2*1024*1024*1024 = 2147483648 (2 gigabytes).

However: 2*1024*1024*1024*1024 = 2199023255552 (2 tetrabytes).

Looks like a limit in the implementation of the unix command "dd" on your Operating System.


Hope this helps.
# 4  
Old 03-24-2010
Maths was never my forté ;-).
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