Re: Software RAID5
On Tue, Jun 06, 2006 at 09:25:48AM +0200, Goswin von Brederlow wrote:
> I doubt that is ready yet. But other transformations are, raid5 with n
> disks to n+1 disks and such. None of those will do filesystem
> transformations and they don't need to. They just rearange the
> underlying block device to the new scheme. If the device size changes
> you have to resize the FS yourself.
Rearanging the underlying blocks is a major job, and if interrupted in
the middle, leaves a huge mess (unless it cleverly maintains the state
of the data somewhere). The filesystem part on top is trivial to deal
with afterwards.
On the other hand, moving from raid5 with n disks to raid6 with n+1
disks, ought to be easier, although still not trivial.
Resizing raids is one of the few places a good hardware raid card seems
to have an advantage.
Len Sorensen
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