[OpenAFS] Changing reserved block on ext3 with fs running

[Tim Spriggs]

Isn't there something about needing a small percentage of space to be able
to keep the ext3/ext2 filesystem from fragmenting too much? Does this
apply here?

Also, is there a problem with running on ext3? I only ask because I know
openafs can not use journaling filesystems under Solaris.

Thanks,
-Tim

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On Wed, 5 Oct 2005, Stephan Wonczak wrote:

>   Hi!
>
> On Wed, 5 Oct 2005, Frank Burkhardt wrote:
>
> <snip>
> > >   Now the question: Are there any repercussions when changing the number
> > > of reserved blocks in this way, or are there any subtle side effects on
> > > the fileserver?
> >
> > AFAIK there should be no problem using 'tune2fs -r' or 'tune2fs -m' on
> > a mounted filesystem (I just tried it).
>
>   'Should' is a word we are very reluctant to use in a production
> environment :-)
>
> > But you most probably needn't do that. The reserved blocks are only
> > accessible to a given user (see 'tune2fs -l /dev/ice | grep uid') when the
> > limit is reached. But this given user is root by default and AFS-Fileservers
> > are running as root. Reserved blocks simply don't matter in this case.
>
>   Well, in principle you are correct. But the fileserver seems to use only
> the non-reserved blocks (you can check this with vos partinfo). So the fs
> will report 'no space left' even if the reserved blocks are available.
> There is nothing wrong with this behavior, actually this is correct as far
> as I am concerned (this way root has a chance of some cleanup even if the
> fs started to scribble like mad).
>   So the question remains: Any nasty sideffects on changing the number of
> reserved blocks and thus the usable capacity of a vice partition while the
> fileserver is running?
>
> 	Dipl. Chem. Dr. Stephan Wonczak
>
>         Zentrum fuer Angewandte Informatik (ZAIK)
>         Regionales Rechenzentrum der Universitaet zu Koeln (RRZK)
>         Universitaet zu Koeln, Robert-Koch-Strasse 10, 50931 Koeln
>         Tel: ++49/(0)221/478-5577, Fax: ++49/(0)221/478-5590
>
>
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