linux-ext4 - Re: File limit inside a single directory

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Message-ID: <54DD0091.1050104@redhat.com>
Date:	Thu, 12 Feb 2015 13:35:45 -0600
From:	Eric Sandeen <sandeen@...hat.com>
To:	suntrop@....de, linux-ext4@...r.kernel.org
Subject: Re: File limit inside a single directory

On 2/12/15 1:16 PM, suntrop@....de wrote:
> Hello, i’m using a CMS which puts many files inside a single
> directory. I’m wondering what the maximum number of files is which
> can reside inside said directory. Is there a number which should not
> be exceeded on account of performance reasons e.g. Is there a
> difference between ext3 and ext4?
> 
> Thanks!

for htree directories, you will be limited by the max size of the tree, which currently is of limited depth.  That limit then depends on block size and filename lengths.

for 4k blocks, and 40 char names, you max out at around 20 million directory entries, if my old spreadsheet is still correct.

That limit is the same for ext3 and ext4.

performance-wise, to be honest, I'm not sure.  how many inodes are you talking about?

-Eric

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