Filesystems

[Stefan Großhauser]

Hallo,

mir fällt bei der Gelegenheit das Handbuch von Gentoo ein, welches sagt:

"Filesystems?
 
The Linux kernel supports various filesystems. We'll explain ext2, ext3, 
ReiserFS, XFS and JFS as those filesystems are most commonly used on Linux 
systems. 

ext2 is the tried and true Linux filesystem but doesn't have metadata 
journaling, which means that routine ext2 filesystem checks at startup time 
can be quite time-consuming. There is now quite a selection of 
newer-generation journaled filesystems that can be checked for consistency 
very quickly and are thus generally preferred over their non-journaled 
counterparts. Journaled filesystems prevent long delays when you boot your 
system and your filesystem happens to be in an inconsistent state. 

ext3 is the journaled version of the ext2 filesystem, providing metadata 
journaling for fast recovery in addition to other enhanced journaling modes 
like full data and ordered data journaling. ext3 is a very good and reliable 
filesystem. It has an additional hashed b-tree indexing option that enables 
high performance in almost all situations. In short, ext3 is an excellent 
filesystem. 

ReiserFS is a B*-tree based filesystem that has very good overall performance 
and greatly outperforms both ext2 and ext3 when dealing with small files 
(files less than 4k), often by a factor of 10x-15x. ReiserFS also scales 
extremely well and has metadata journaling. As of kernel 2.4.18+, ReiserFS is 
solid and usable as both general-purpose filesystem and for extreme cases 
such as the creation of large filesystems, the use of many small files, very 
large files and directories containing tens of thousands of files. 

XFS is a filesystem with metadata journaling that is fully supported under 
Gentoo Linux's xfs-sources kernel. It comes with a robust feature-set and is 
optimized for scalability. We only recommend using this filesystem on Linux 
systems with high-end SCSI and/or fibre channel storage and a uninterruptible 
power supply. Because XFS aggressively caches in-transit data in RAM, 
improperly designed programs (those that don't take proper precautions when 
writing files to disk and there are quite a few of them) can lose a good deal 
of data if the system goes down unexpectedly. 


JFS is IBM's high-performance journaling filesystem. It has recently become 
production-ready and there hasn't been a sufficient track record to comment 
positively nor negatively on its general stability at this point."

Das war Anfang 2004