New option for newfs(3) to make life with GEOM easier

Dmitry Morozovsky marck at
Sun Sep 2 22:55:06 PDT 2007

On Mon, 3 Sep 2007, Ivan Voras wrote:

IV> > IV> Why not go a bit further and reserve 1 sector by default? I mean: keep
IV> > IV> the option, but if the GEOM people agree that only the last sector is in
IV> > IV> question here (and I think all current GEOM classes behave this way),
IV> > IV> reserve the 1 sector by default. Nobody will notice but some foot
IV> > IV> shooting will be avoided.
IV> > There are possibilities that you can decide to use more than one GEOM layers 
IV> > under your file system.
IV> Of course, but I don't think this is significant in practice: except
IV> gmirror, what else would you like to put on a existing file system?

My example which leads me to write the patch: gcache under graid3.

Since then, I usually reserve 8 sectors at the end of each file system - just 
in case.

D.Marck                                     [DM5020, MCK-RIPE, DM3-RIPN]
[ FreeBSD committer:				     marck at ]
*** Dmitry Morozovsky --- D.Marck --- Wild Woozle --- marck at ***

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