On Tue, Nov 22 2016, Andy Smith wrote: > Hi Neil, > > On Tue, Nov 22, 2016 at 09:56:28AM +1100, NeilBrown wrote: >> Thanks. Sorry this is taking a lot of back-and-forth... > > No worries. This is very interesting to me and I'd also like to know > what is going wrong even if I have a work-around. Thanks. I tried this on a scratch Debian VM I had lying around, and found I could exactly reproduce your symptoms. I found that, unlike on the first Debian system I looked at, there is a line in /lib/udev/rules.d/64-md-raid-assembly.rules # Disable incremental assembly to fix Debian bug #784070 GOTO="md_inc_end" Remove that and the problem goes away. Arrgg... I wish people maintainers would *ask* upstream when they don't understand, rather than just breaking things. NeilBrown
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