On Sun, 28 Jan 2001 at 6:13pm (-0500), Fred Whipple wrote:
> RaghuNath L wrote:
> >
> > Raiserfs is very heavy like fat file system and only benifit is it does
> > not take time after power off with out propershutdown .
> >
> > it not recomended at production environment.
>
> I will have to disagree on this one...
>
> ReiserFS is a _journaling_ file system (and has other interesting
> benefits that are of use mainly to developers, not so much
> users/administrators).
>
> Noting that it "does not take time after power off without
> propershutdown" is truley an understatement. Since it is a journaling
> filesystem, it keeps a journal of file system changes before actually
> making them. What this means is if it is not cleanly unmounted, you are
> *far, far* less likely to experience file corruption. And true, because
> of the journal, it does mount very quickly after an unsafe shutdown
> which is of HUGE benefit if you have a server with a couple hundred
> gigabytes or even a couple terrabytes of data. Running e2fsck on such
> large disks could take hours.
Just a nit pick but I an important one I think. Journaling protects against
file _system_ corruption. There's no guarantees about your the state of
your files and data. This isn't rieserfs sepecific but a general rule for
journaling filesystems. This is becuase only metadata is journaled (this if
file is so many bytes in that directory with yay many links written on such
and such blocks) but the actually data/contents of the file isn't.
Actually ext3 offers data journalling (for early versions of ext3 data
journaling was non-optional) but the preformance hit is very significant.
> ReiserFS is also noted as quite stable at this point and worthy of
> production servers. Some distributions (SuSE comes to mind) are now
> supporting it even during installation.
Stable in the sence of "this software will not crash" yes but less so in the
sence of version X will be compatible with version Y. But these caveats are
well noted and are just things to be aware of not things to stop you putting
it into production.
> There are other offerings presently, including a path which adds
> journaling to ext2fs, as well as IBM's JFS. I'm not aware of their
> statuses.
Also XFS from SGI. All 3 are in a "it works but don't come crying to us"
stage of development.
M.
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