Re: resizing of raid5?

[Neil Brown]

On Wednesday August 1, [e-mail] wrote:
> Neil Brown writes:
> > On Wednesday August 1, [e-mail] wrote:
> > > Just figured if anyone could give some information about resizing of
> > > software raid5 systems (2.4.x kernels)? I've been looking all over for
> > > information about if this is possible or not currently, and if not, how
> > > this system of raid cluster blocks work in conjunction with ext2.
> > 
> > The only way to resize a raid5 array is to back up, rebuild, and
> > re-load.  Any attempt to re-organise the data, or the linkage, to
> > avoid this would be more trouble that it is worth.
> 
> Hmm, this surprises me.  I would have thought it possible to do
> "resizing" at least by adding new stripes to the end of the current
> RAID 5 volume, using N+1 new "disks" to make up a new stripe group.

But would you bother.  just make another RAID5 set and append it to
the end using RAID-linear or LVM.  Achieve the same effect at a more
accessible level.  Or am I misunderstanding you?

NeilBrown