Re: External journals and NVRAM devices

[Edward Shishkin <edward@namesys.com>]

Edward Shishkin wrote:
> 
> JP Howard wrote:
> >
> > On Fri, 01 Nov 2002 17:30:18 +0300, "Edward Shishkin"
> > <edward@namesys.com> said:
> > > Yes. And the experience said that external logging brings a bit better
> > > effect for this journal mode then for other ones.
> > >
> > > > >Is there a command to show the current journal size?
> > >
> > > #debugreiserfs main_device
> > >
> > Hmmm...
> > ----
> > Blocksize: 4096
> > <...>
> > Journal parameters:
> > <...>
> >         Size 8193 blocks (including 1 for journal header) (first block
> >         18)
> > ----
> >
> > So my journal is only 32k?
> 
> Yes. Standard journal can be only 32K.

Sorry, 32M!

> 
>  With Ext3 I used 192MB journal in data=journal
> > mode. Should I be using a size around that when using data=journal with
> > ReiserFS too? Why is the default so low?--is it because the data logging
> > patches don't automatically change it?
> 
> Reiserfs journal size doesn't depend on journal mode.
> 
> > >
> > > The journal size remains the same unless you specify another one by
> > > reiserfstune utility.
> > >
> > And non-standard journal sizes don't work under 2.4, right? Or are there
> > patches for this that are reasonably stable?
> 
> Yes they are. Let me specify it on next week unless Oleg will do it earlier.
> Edward.