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Full Discussion: Copy data over a TB
Operating Systems Solaris Copy data over a TB Post 302584482 by hombreopaco on Friday 23rd of December 2011 10:52:45 AM
Old 12-23-2011
Copy data over a TB
Hi vishalaswani, there is a big difference in the copy performance of a filesystem if you have a lot of little files or a few big files, I think that if you are in the first case, you can use the command you explain, but if you are in the second case, perhaps you can try rsync, it will be faster, the command will be, for instance:

rsync -Havx ORIGINAL_FOLDER DESTINATION_FOLDER

Where DESTINATION_FOLDER can be a local folder or something like server:/folder, whit this parameters you will have a mirror copy, including the links. You can use -e rsh in order to avoid the default ssh option. Of course, if the folder structure is really big, you can launch a "foreach" command whit a rsync by folder, so you can copy several folders at the same time which can not be done with ufsdump. I'm copying around 4,5TB all nights from my NFS main server to a slow disk machines which a script based in this idea.

Also, you can use the same command with tar instead of ufsdump, it's a little bit faster, but remember the E option if you use long names.
 

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LEARN ABOUT FREEBSD

dumpfs

DUMPFS(8)						    BSD System Manager's Manual 						 DUMPFS(8)

NAME

     dumpfs -- dump UFS file system information

SYNOPSIS

     dumpfs [-f] [-l] [-m] filesys | device

DESCRIPTION

     The dumpfs utility prints out the UFS super block and cylinder group information for the file system or special device specified, unless the
     -f, -l or -m flag is specified.  The listing is very long and detailed.  This command is useful mostly for finding out certain file system
     information such as the file system block size and minimum free space percentage.

     If -f is specified, a sorted list of all free fragments and free fragment ranges, as represented in cylinder group block free lists, is
     printed.  If the flag is specified twice, contiguous free fragments are not collapsed into ranges and instead printed in a simple list.
     Fragment numbers may be converted to raw byte offsets by multiplying by the fragment size, which may be useful when recovering deleted data.

     If -l is specified, the pathname to the file system's container derived from its unique identifier is printed.

     If -m is specified, a newfs(8) command is printed that can be used to generate a new file system with equivalent settings.  Please note that
     newfs(8) options -E, -R, -S, and -T are not handled and -p is not useful in this case so is omitted.  Newfs(8) options -n and -r are neither
     checked for nor output but should be.  The -r flag is needed if the filesystem uses gjournal(8).

SEE ALSO

     disktab(5), fs(5), disklabel(8), fsck(8), newfs(8), tunefs(8)

HISTORY

     The dumpfs utility appeared in 4.2BSD.

BSD
								   May 16, 2013 							       BSD
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