File copy issue in Solaris Post: 302957827

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Operating Systems Solaris File copy issue in Solaris Post 302957827 by Don Cragun on Thursday 15th of October 2015 01:52:03 PM

10-15-2015

Registered User

Quote:

Originally Posted by Peasant

Check if your zfs filesystem in question is using compression and/or deduplication.
That can cause confusion with du, if you are not aware that it is turned on.

GNU du has --apparent-size which can be usefull on zfs filesystems and is present as gdu on Solaris 11 and later.

Also you might want to run md5sum or cksum to check if the files are the same on source and destination.

Hope that helps
Regards
Peasant.

Deduplication is what I was talking about in post #2 in this thread. But comparing the source and destination is going to fail if du is showing that the destination is growing over time after the copy completes.

I asked for the EXACT du command that was being used to look at the size of the destination file and was told that the command used was:

Code:

du -sh

which will not tell you the number of blocks allocated to any particular file; it gives you the number of disk blocks allocated to all files in the file hierarchy rooted in the current working directory that are in the same filesystem as the current working directory.

The fact that ls -l shows the correct file size is a clear indicatory that the copy completed successfully and if:

Code:

du -sh source_file destination_file

is showing destination_file with in initial allocation of 0 blocks after the copy completes and an increasing allocation as time passes, it means that new blocks are being allocated to destination_file as blocks in source_file and/or destination_file are being changed after the copy completed.

Don Cragun

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extutils::command5.18

ExtUtils::Command(3pm)					 Perl Programmers Reference Guide				    ExtUtils::Command(3pm)

NAME

       ExtUtils::Command - utilities to replace common UNIX commands in Makefiles etc.

SYNOPSIS

	 perl -MExtUtils::Command -e cat files... > destination
	 perl -MExtUtils::Command -e mv source... destination
	 perl -MExtUtils::Command -e cp source... destination
	 perl -MExtUtils::Command -e touch files...
	 perl -MExtUtils::Command -e rm_f files...
	 perl -MExtUtils::Command -e rm_rf directories...
	 perl -MExtUtils::Command -e mkpath directories...
	 perl -MExtUtils::Command -e eqtime source destination
	 perl -MExtUtils::Command -e test_f file
	 perl -MExtUtils::Command -e test_d directory
	 perl -MExtUtils::Command -e chmod mode files...
	 ...

DESCRIPTION

       The module is used to replace common UNIX commands.  In all cases the functions work from @ARGV rather than taking arguments.  This makes
       them easier to deal with in Makefiles.  Call them like this:

	 perl -MExtUtils::Command -e some_command some files to work on

       and NOT like this:

	 perl -MExtUtils::Command -e 'some_command qw(some files to work on)'

       For that use Shell::Command.

       Filenames with * and ? will be glob expanded.

   FUNCTIONS
       cat
	       cat file ...

	   Concatenates all files mentioned on command line to STDOUT.

       eqtime
	       eqtime source destination

	   Sets modified time of destination to that of source.

       rm_rf
	       rm_rf files or directories ...

	   Removes files and directories - recursively (even if readonly)

       rm_f
	       rm_f file ...

	   Removes files (even if readonly)

       touch
	       touch file ...

	   Makes files exist, with current timestamp

       mv
	       mv source_file destination_file
	       mv source_file source_file destination_dir

	   Moves source to destination.  Multiple sources are allowed if destination is an existing directory.

	   Returns true if all moves succeeded, false otherwise.

       cp
	       cp source_file destination_file
	       cp source_file source_file destination_dir

	   Copies sources to the destination.  Multiple sources are allowed if destination is an existing directory.

	   Returns true if all copies succeeded, false otherwise.

       chmod
	       chmod mode files ...

	   Sets UNIX like permissions 'mode' on all the files.	e.g. 0666

       mkpath
	       mkpath directory ...

	   Creates directories, including any parent directories.

       test_f
	       test_f file

	   Tests if a file exists.  Exits with 0 if it does, 1 if it does not (ie.  shell's idea of true and false).

       test_d
	       test_d directory

	   Tests if a directory exists.  Exits with 0 if it does, 1 if it does not (ie. shell's idea of true and false).

       dos2unix
	       dos2unix files or dirs ...

	   Converts DOS and OS/2 linefeeds to Unix style recursively.

SEE ALSO

       Shell::Command which is these same functions but take arguments normally.

AUTHOR

       Nick Ing-Simmons "ni-s@cpan.org"

       Maintained by Michael G Schwern "schwern@pobox.com" within the ExtUtils-MakeMaker package and, as a separate CPAN package, by Randy Kobes
       "r.kobes@uwinnipeg.ca".

perl v5.18.2							    2014-01-06						    ExtUtils::Command(3pm)