> From: Brad Hards [mailto:[EMAIL PROTECTED]]
>
> I am pretty sure that the problems with ext3 and creating
> thousands of files
> under a single directory have been fixed. I went to a talk by Ted
> T'so last
> week (http://linux.conf.au), and this was mentioned.
> Of course, we should try to benchmark real loads on whatever
> filesystems we
> are considering using.
Does this mean 'fixed' as in it won't crash and burn, or as
in making it something you actually want to do? Most unix
filesystems must do a linear scan of an entire directory
when you create a new file to check if it already exists, and
they have to keep the inode locked for the duration. They also
generally don't ever shrink directories so the scan has to
cover the deleted entries of the largest set of files that
have ever been there. The author of the UW IMAP server claims
that it is not practical to store one message per file, hence
the need to use the patched version that supports the maildir
format. ReiserFS uses btrees for directories so the search scales
much better and I think XFS uses some sort of directory hashing.
Either should be much better for that kind of use, and XFS has
the advantage of ACLs that samba can map to match NT settings.
Les Mikesell
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