O-direct on ext3 file ssytem

Marc-Christian Petersen m.c.p at gmx.net
Fri Jul 9 12:22:25 UTC 2004

On Friday 09 July 2004 01:42, david x chan wrote:

Hi David,

> Does anybody know whether the ext3 file system
> support Direct_io?  if so, how do you enable it?
> I went through the man page of mount, and it did
> not mention such option?

ext3 supports direct i/o, but not in 2.4 mainline. It was added in 2.6. 

Further direct i/o isn't a mount option. Please read


for example.

> my system is running :
> Red Hat Enterprise Linux AS release 3 (Taroon Update
> 2)
> Kernel 2.4.21-15.ELsmp on an i686

2.4-aa, 2.4-suse, 2.4-wolk tree and some others have it, 2.4-rh kernels do not 
have it.

ciao, Marc

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