Size difference when copying LARGE file

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Size difference when copying LARGE file

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Size difference when copying LARGE file

Postby 0ktalmagik » Mon, 05 Jun 2006 07:59:11 GMT 

Hi, Im trying to take a database backup. one of the files is 26 GB. I
am using cp -pr to create a backup copy of the database. after the
copying is complete, if i do du -hrs on the folders i saw a difference
of 2GB.

The weird fact is that the BACKUP folder was 2 GB more than the
original one!

when i did du -hrs * inside each of the 2 folders and compared the
output, i found the culprit. it was a file temp.dbf which was 26 GB on
the source(original) folder and 28 GB in the BACKUP folder. I tried the
copy procedure twice and I am getting the same result.

does anyone have any explanation for this. please let me know. I want
to make sure everything is right here in the copy.

PS:- Solaris SPARC 23 BIT.

Thanks
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Re: Size difference when copying LARGE file

Postby Cydrome Leader » Mon, 05 Jun 2006 09:27:33 GMT 



Are you copying a live file, or something in use by the database?
What does ls -l show for file size for original and copy?
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Re: Size difference when copying LARGE file

Postby jgp » Wed, 07 Jun 2006 06:24:01 GMT 

In article < XXXX@XXXXX.COM >,



What does "ls -ls" show for the original and the copy?

Database files are frequently sparse, they have holes that have
never been written to and don't occupy actual disk space.  Eg:
	% dd if=/dev/zero of=t1 bs=1k count=1 seek=10k
	% cp t1 t2
	% ls -ls t1 t2
	  40 -rw-r--r--   1 jgp      10486784 Jun  5 17:17 t1
	10256 -rw-r--r--   1 jgp      10486784 Jun  5 17:18 t2
	% du -s t1 t2
	40      t1
	10256   t2
t1 is only 40k on disk even though the final byte is at lseek
position 10486784.  One copied it grows to 10M since the holes
get filled in.

I believe ufsdump/ufsrestore are the only tools standard tools that
preserve holes in files.

Star (  http://www.**--****.com/ ) handles them.
-- 
Jim Prescott - Computing and Networking Group	 XXXX@XXXXX.COM 
School of Engineering and Applied Sciences, University of Rochester, NY
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Re: Size difference when copying LARGE file

Postby js » Wed, 07 Jun 2006 07:01:12 GMT 

In article <e627dh$ XXXX@XXXXX.COM >,




If you use a pre S-2.6 or a recent Solaris, star is able to correctly copy
holes too. With star there is no need to be root in order to do this (at least
not on a recent Solaris version - the old Solaris hole interface forces you to
be root too).

-- 
EMail: XXXX@XXXXX.COM  (home) Jg Schilling D-13353 Berlin
       XXXX@XXXXX.COM 		(uni)  
       XXXX@XXXXX.COM 	(work) Blog:  http://www.**--****.com/ 
URL:   http://www.**--****.com/ ://ftp.berlios.de/pub/schily
Top

Similar Threads:

1.Size difference when copying a large file in solaris 

Hi, Im trying to take a database backup. one of the files is 26 GB. I
am using cp -pr to create a backup copy of the database. after the
copying is complete, if i do du -hrs on the folders i saw a difference
of 2GB.

The weird fact is that the BACKUP folder was 2 GB more than the
original one!

when i did du -hrs * inside each of the 2 folders and compared the
output, i found the culprit. it was a file temp.dbf which was 26 GB on
the source(original) folder and 28 GB in the BACKUP folder. I tried the
copy procedure twice and I am getting the same result.

does anyone have any explanation for this. please let me know. I want
to make sure everything is right here in the copy.

PS:- Solaris SPARC 32 BIT.

Thanks

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I am curious as to why the total number of blocks differ between the
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blocks. Is this normal?


John

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