Re: Nombre maximal de fichiers dans un répertoire
Le vendredi 17 janvier 2003, Eric BERTHOMIER a écrit...
bonjour,
En FAT32, le nombre de fichier maximum dans un répertoire est de 65535.
Je me demandais si une telle limite existait sous linux. Je suppose
qu'en plus elle dépend du système de fichiers ...
voici un extrait de la doc
"/usr/src/linux/Documentation/filesystems/ext2.txt" concernant le
système de fichier ext2 :
Elle indique une limite de 32768 sous-répertoires possible dans un seul
répertoire, ou 130 trillion (en anglais) fichiers (avec certaines
restrictions).
Quelle est la traduction Française de trillion en anglais ?
Limitations
-----------
There are various limits imposed by the on-disk layout of ext2. Other
limits are imposed by the current implementation of the kernel code.
Many of the limits are determined at the time the filesystem is first
created, and depend upon the block size chosen. The ratio of inodes to
data blocks is fixed at filesystem creation time, so the only way to
increase the number of inodes is to increase the size of the filesystem.
No tools currently exist which can change the ratio of inodes to blocks.
Most of these limits could be overcome with slight changes in the on-disk
format and using a compatibility flag to signal the format change (at
the expense of some compatibility).
Filesystem block size: 1kB 2kB 4kB 8kB
File size limit: 16GB 256GB 2048GB 2048GB
Filesystem size limit: 2047GB 8192GB 16384GB 32768GB
There is a 2.4 kernel limit of 2048GB for a single block device, so no
filesystem larger than that can be created at this time. There is also
an upper limit on the block size imposed by the page size of the kernel,
so 8kB blocks are only allowed on Alpha systems (and other architectures
which support larger pages).
There is an upper limit of 32768 subdirectories in a single directory.
There is a "soft" upper limit of about 10-15k files in a single directory
with the current linear linked-list directory implementation. This limit
stems from performance problems when creating and deleting (and also
finding) files in such large directories. Using a hashed directory index
(under development) allows 100k-1M+ files in a single directory without
performance problems (although RAM size becomes an issue at this point).
The (meaningless) absolute upper limit of files in a single directory
(imposed by the file size, the realistic limit is obviously much less)
is over 130 trillion files. It would be higher except there are not
enough 4-character names to make up unique directory entries, so they
have to be 8 character filenames, even then we are fairly close to
running out of unique filenames.
--
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| FREDERIC MASSOT |
| http://www.juliana-multimedia.com |
| mailto:frederic@juliana-multimedia.com |
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