Comment 28 for bug 666577

dm-raid45 doesn't work correctly in 11.04 with the default module. It will not load my RAID arrays. I believe it may have difficulty distinguishing between the two RAID 5 arrays which both share 3 drives.

As for the one I attempted to compile, that was back in 10.10 when the module still didn't work and I thought I might be able to rework some of the code to correct it. Before reworking, dmraid4-5 was giving me all sorts of compilation errors. I have not since tried to recompile dmraid. This error goes back to the late version 9.xx Ubuntu and hasn't been resolved since.

On a slightly related note, Mr. Wood, I've noticed that many of the problems previously resolved in updates to 10.10 have returned in 11.04 which indicates to me that some modules here and there have, in fact, been reverted. So raid456 may very well be in the kernel, but, as you've stated, it isn't being used. I've also mentioned another error involving display hardware that could be taken advantage of as a security risk, but someone marked it as not important and not a risk. So I don't know what to think about some of the module issues at this point.