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