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Re: After the copy, there is a directory size mismatch.

On 02Jun2006 16:29, unix syzadmin <unixsyzadmin gmail com> wrote:
| I am copying from one redhat linux server to another using scp recursive
| copy (scp -r).  After the copy, there is a directory size mismatch.  Please
| suggest.
| Source
| =====
| du -sk *
| 4       all_env.sh
| 16      all_home
| 816     ALSB_2.1
| 628     Certification_Docs
| 6743852 Diamond
| 656952  installed_software
| 28296   jrockit142
| 73548   jrockit-j2re1.4.2_08
| 16      lost+found
| 780     wls90_certification_docs
| Destination
| ========
| du -sk *
| 4       all_env.sh
| 8       all_home
| 772     ALSB_2.1
| 572     Certification_Docs
| 6709356 Diamond
| 652824  installed_software
| 28288   jrockit142
| 71364   jrockit-j2re1.4.2_08
| 4       lost+found
| 688     wls90_certification_docs
| Note: The source is RHEL AS 4 Update1, the destination is a RHEL AS 3
| (Taroon).

There can be small discrepancies due to directory usage.

An active directory (which is a special type of file with name/inode
information in it, underneath) will acquire gaps in its data (eg
suppose you remove a file - it is more efficient to leave an "empty"
slot in the directory file data than to rewrite the whole directory).
So the physical sized of the directories themselves may differ even
though they contain the same filenames; the new directory from your copy
will often be smaller because is has only ever had stuff added to it,
and so probably has the most compact internal data structure.

It is also possible, though unlikely, that there were "sparse" files in
your original directory; they may not be sparse in the new copy.

Try checking for differences using "diff -r" or "rsync -rn".
If they think things are the same you should be ok.

You can check this directly, too. Choose a large and busy directory from
your original and check is size:

	ls -ld path-to-directory

Repeat for the corresponding directory in the copy.

Cameron Simpson <cs zip com au> DoD#743

But pessimism IS realism!       - D.L.Bahr

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