[rescue] Linux FSs
mroos at linux.ee
Fri Dec 5 01:56:14 CST 2008
> What does the list think?
Ext3 is my default - it's not the fastest but it's the most dependable
(and usually not much slower than others). I have not lost any data with
it other that doing a forced fsck on a mounted FS for my own stupidity
once. The toolchain is the most tried-and-tested.
I also use XFS sometimes - it used to have trouble sometimes with deep
call chains and stack overflows (especially on top of RAID + LVM) but it
should be fixed by now.
Have not really used JFS so I don't have an opinion on that.
Ext2 is only a special-purpose FS - it can lose files on a power failure
so it's for a fast scratch partition (like for code compilation - code
itself lives in some SCM) or on slow flash devices etc.
Reiserfs I do not trust - I have even recently come to a machine where
somebody installed reiserfs on 64-bit system and that was known to cause
corruption - and it did. Might be finally fixed but it's too late.
Reiser4 never got polised enough to be ready (like degrading performace
over time and needing a repacker).
There's also Ext4 now (about to be declared not exerimental any more in
some weeks with 2.6.28 kernel release). I do not consider it stable yet
(takes at least a year of public testing and bugfixing) but it seems to
be holding promise:
Ext4 is an evolutionary change from ext3 - extents, delayed allocation
etc but no revolutionary changes.
Ext4 is supposed to be a bridge in transition from ext3 to btrfs. Btrfs
is the next-generation FS designed by Oracle and a former ReiserFS
developer. Given Sun is clearly not interested in making ZFS work on
GPL-ed free software projects, the Linux developers considered it to be
a waste of time trying to reimplement ZFS (and fear for patent
litigation from Sun) but to implement a
at-least-as-good-but-hopefully-better filesystem themselves - Btrfs.
Current development snapshots show it's fast but it's not there yet and
will not be in the near future.
Meelis Roos (mroos at linux.ee)
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