John,<br><br>No, that was due to framentation. A fresh copy (one night to copy, then 2 hours to backup, 6 times faster then) solved that problem.<br>There's a filefrag utility, and for some mailboxes, it was over 60%. I have 3 500Mo spools at the moment. And one is left for the copy..<br>
<br>You copy first your data, then you destroy randomly small files and you fill the holes randomly..<br>Ext4 is said to do delayed allocation, in order to have a decent idea of the file size when writing to disk<br><br>Dom<br>
<br><div class="gmail_quote">2008/12/30 John Madden <span dir="ltr"><<a href="mailto:jmadden@ivytech.edu">jmadden@ivytech.edu</a>></span><br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div class="Ih2E3d">> Once, there was a bad shutdown corrupting ext3fs and we spent 6 hours on an<br>
> fsck.<br>
> Next we discovered that our backup system was going slower and slower. We<br>
> just pointed out that it was due to fragmentation, and guess what, there's<br>
> no online defrag tool for ext3.<br>
<br>
</div>Sure it isn't due to the number of files on those filesystems? File-level<br>
backups will slow down linearly as the filesystems grow, of course.<br>
I "solve" this by adding more spools (up to 8 at the moment with about 350k<br>
mailboxes) so they can be backed up in parallel. All on ext3.<br>
<br>
John<br>
<br>
<br>
<br>
<br>
--<br>
<font color="#888888">John Madden<br>
Sr. UNIX Systems Engineer<br>
Ivy Tech Community College of Indiana<br>
<a href="mailto:jmadden@ivytech.edu">jmadden@ivytech.edu</a><br>
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</font></blockquote></div><br><br clear="all"><br>-- <br>Dominique LALOT<br>Ingénieur Systèmes et Réseaux<br><a href="http://annuaire.univmed.fr/showuser?uid=lalot">http://annuaire.univmed.fr/showuser?uid=lalot</a><br>