Journaling filesystems

[christian mock]

On Mon, Oct 28, 2002 at 02:28:51PM -0500, dsr+inn at mail.lns.cornell.edu wrote:

> > We're now running with journaling filesystems.
> 
> Which one?  Many "journaling" filesystems (including apparently most
> of the ones for Linux) only journal metadata, not data (journaling
> data can be significantly slower).

I've done some SMTP benchmarking (postfix) with ext3 on linux, trying
the different "data=" options; the fastest and safest one was
"data=journal" which journals data and metadata -- and postfix does a
lot of fsync-ing; the performance advantage apparently comes from the
fact that the fsync appends the data to the journal, therefore sparing
the OS a lot of seeks on the data files.

just my 2c,

cm.

-- 
** christian mock in vienna, austria -- http://www.tahina.priv.at/~cm/
** VIBE!AT http://www.vibe.at/ ** wir sind nicht zum spass hier.
Ich kenne auch ein Klo, wo "Austria Email" draufsteht. Das ist
wahrscheinlich eine Art Rohrpost. -- Robert Bihlmeyer in at.sonstiges