vinum or gvinum on FreeBSD 5.4

Paul Mather paul at
Thu Apr 21 16:07:43 PDT 2005

> On Thu, 2005-04-21 at 10:39 +0200, Claus Guttesen wrote:
> > Hi.
> > 
> > I may implement (g)vinum to stripe two 2 TB raid 5 volumes into a
> > single 4 TB vinum-volume. The volumes reside on a atabeast doing the
> > raid 5. The server is a 5.4 RC2 doing nfs on i386.
> > 
> > According to some threads gvinum may not be completely stable (in 5.3,
> >
> > when doing raid 5 but works fine when striping.
> > 
> > Should I go vinum or gvinum? Will newfs have problems with a 4 TB
> > volume? Are there any performance-degradation doing striping?

I forgot to mention, but you should consult to get an idea of the current
state of play and issues regarding large disk handling in FreeBSD.
According to the table of userland tools, it should be okay to newfs a
file system > 2 TB, but you might not be able to fsck or dump/restore
it. :-(  Also, I think that page holds for -CURRENT, and may not apply
to 5.x.

But, Pawel Jakub Dawidek has worked on large disk support, and so
there's a good chance that his geom_stripe feature is able to handle > 2
TB sizes.  You could test it via gstripe on large swap-backed md

I also dimly recall you may run into problems running out of RAM trying
to fsck very large filesystems.


e-mail: paul at

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