On Sat, 9 Feb 2013, Jiri B wrote:
> On Sat, Feb 09, 2013 at 02:56:47AM +1100, Joel Sing wrote:
> > While stacked softraid volumes generally work, they are not officially
> > supported (for a variety of reasons). The problem that you mention above
> > is due to the way that softraid volumes are shutdown - the shutdown order
> > is approximately the same as the order they are created. In your case
> > this means that sd3 gets shutdown before sd4, hence sd4 is unable to
> > write metadata to sd3. For the time being, in order to avoid the issue
> > you should disassemble the CRYPTO volume (sd4) before the RAID 1 volume
> > (sd3).
>
> Would stackable softraid volumes work in near future or is it big
> problem as how softraid was designed?
Generally speaking they already "work" - there are just some caveats,
primarily relating to assembly and shutdown. Most of the issues are fairly
easily fixed or are at least solvable (the shutdown ordering should be
simple - I just need to move it up the priority list). That said, longer term
I would rather have disciplines such as RAID1C and RAID10 that handle the
stacking internally and allow for better operation and management.
--
"Reason is not automatic. Those who deny it cannot be conquered by it.
Do not count on them. Leave them alone." -- Ayn Rand
