Heho, On Wed, 2023-01-04 at 00:04 +0000, Stuart Henderson wrote: > stacking would refer to creating one softraid (say a raid1 mirror) > and then creating a separate softraid device (say a crypto volume) > using the first softraid disk as a component.
Incidentally, if you happen to have a thing for doing _really_ stupid things, you _can_ actually do that; I ran RAID10 that way for some time... but then again I would not recommend anybody else doing it for data they are in some form even mildly attached to... ;-) I think the important part here is the meaning of 'supported'; In the context of the man page i read it as: 'By holding it a certain way, you _could_ make stacking "work". However, it will not integrate well into the system, you will have to jump through interesting hoops, there is not even a remote suggestion of standard operations working (say, replacing a disk), and you are more likely than not to encounter unexpected behavior which will ultimately migrate the data stored on your disks to an unstructured and unusable pile of mangled bits; Furthermore, in case that _does_ happen, please do not annoy people with your stacking attempt; We told you not to do it, we told you it would hurt, and you did it anyway.' So... i'd say there is no error in softraid(4), even if you can technically make stacking "work". With best regards, Tobias
