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Re: EXT3 with 2.2.20 - Is it stable enough for a production server th at is used 24X7?



On Fri, Nov 16, 2001 at 01:17:33AM -0700, Andreas Dilger wrote:
> On Nov 16, 2001  08:10 +0100, Giulio Orsero wrote:
> > On Thu, 15 Nov 2001 13:25:52 -0700, you wrote:
> > >You can check the size with:
> > >debugfs <dev>
> > >debugfs> stats      (will tell you the journal inode number, probably 8)
> > >...
> > It was 32MB, I set it to 4MB.
> > I made 4 consecutive bonnie runs with -s 128 and all was ok for the 1st
> > time, even if sometime mem was very low (vmstat displayed about 500k for
> > 10/15sec).
> > 
> > Since I have 8 fs on this system, if I enable a 4MB journal on all of them
> > and mount them all as ext3, will I have the same problem as with 1 fs with 1
> > 32MB journal?
> 
> Only if you are running bonnie on all of them at the same time.  Normally
> ext3 will only hold (at most) 5 seconds of _metadata_ changes to your
> filesystems in memory.  That will normally not even be close to filling
> the journal.
> 
> Probably in 2.5, there will be changes to allow the VM to tell the
> journal to free up some memory when it is running low.
> 

But, this is ext3 on a 2.2 kernel.  Doesn't 2.4 work better on this?





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