linux-ext4 - How many files to create in one directory?

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Date:	Mon, 27 Jan 2014 16:16:01 +0900
From:	Masato Minda <minmin@...s.co.jp>
To:	linux-ext4@...r.kernel.org
Subject: How many files to create in one directory?

Dear Ext4 Developer;

I've copied the files from VxFS to EXT4, I saw the message “Directory
index full!”. I've checked the search engine and found these mails.

  http://www.spinics.net/lists/linux-ext4/msg25058.html
  http://www.spinics.net/lists/linux-ext4/msg25069.html

Our Ext4's block size was 1024. I've changed the block size from 1024 to
4096. Our problem was solved. But I have question.

How many files to create in one directory in 4096 block size?
I think that it is about 3 million files with perfect hashing.

  16*(4096-16)/8*(4096-8)/8*3/4= 3M

Is this correct?

Thanks in advance.

--
Masato minmin Minda <minmin@...s.co.jp>
Japan Registry Services Co., Ltd. (JPRS)

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