sean finney on 3 Sep 2009 03:48:15 -0700

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Re: [PLUG] File System Directory Limits

On Wed, Sep 02, 2009 at 11:45:11PM -0400, Walt Mankowski wrote:
> need to consider performance.  Many file systems do a linear search
> through the directory table to find subdirectories.  My experience
> with ext3 is that performance slows down considerably long before you
> reach whatever the hard limit is.

you probably want to make sure dir_index is enabled on the filesystem,
though i can't make any claims about whether or not removes the
performance problems in part or entirely.

> While I've never used it, I hear that reiserfs is supposed to be very
> good at storing large numbers of subdirs efficiently.

yes, it has "killer" performance.  

but more seriously, after the 2nd or 3rd time you completely lose your
entire filesystem during a fsck, you'll probably reconsider using it in
future installs.


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