On Wed, Dec 02, 2015 at 10:44:44AM +0100, Patrik Lundin wrote: > On Tue, Dec 01, 2015 at 05:53:22PM -0800, Nathan Wheeler wrote: > > I have a similar sort of setup during installs and I clear out the > > first 10m before setting up the CRYPTO disk and it works for me. I > > don't think you're zeroing out enough at the beginning of the disk. > > > > dd if=/dev/zero of=/dev/rsd0c bs=10m count=1 > > > > Following your tip i tried the following series of commands which failed in > the > same way: > === > # dd if=/dev/zero of=/dev/rsd0d > # dd if=/dev/zero of=/dev/rsd0a bs=1m count=1 > # dd if=/dev/zero of=/dev/rsd0c bs=10m count=1 > === > > I then tried the following variant which also failed: > === > # dd if=/dev/zero of=/dev/rsd0d > # dd if=/dev/zero of=/dev/rsd0a bs=10m count=1 > # dd if=/dev/zero of=/dev/rsd0c bs=1m count=1 > === > > Finally i tried this just to cover all possibilities, which also failed: > === > # dd if=/dev/zero of=/dev/rsd0d > # dd if=/dev/zero of=/dev/rsd0a bs=10m count=1 > # dd if=/dev/zero of=/dev/rsd0c bs=10m count=1 > === > > I might have been unclear on this point (and I am not sure if this is > how you are doing it) but the above commands are executed on the running > system before rebooting into the installer. Could it be that the kernel > writes out some in-memory softraid information to the disk before > rebooting?
If you are zeroing the char devices under the feet of a running OS i would not dare to guess what happens. Can you try to zero the key disk and the first 1MB of the RAID partition from bsd.rd instead? > > I have noticed that just leaving a "dd if=/dev/zero of=/dev/rsd0c bs=1m" > "long enough" will work, but it feels too brittle, and my optimal > situation would be that the system is able to operate after the above > commands are run, only having an impact after a reboot or power outage, > which the unbounded dd does not achieve (this might not be an achievable > goal at all of course). > > -- > Patrik Lundin -- / Raimo Niskanen, Erlang/OTP, Ericsson AB
