Public bug reported:
Binary package hint: partman-md
Partman fails if you try to set up raid with existing raid superblocks on some
devices. (i.e. on re-installs/updates, if you want to reuse or even if you
deleted exsiting raid partitions/devices.)
Partman may get confused as raid devices get set up after partman
(re)creates a partition and it happens that there is an superblock (at
the beginning or end). Udev/mdadm sets it (partially) up and devices are
in use.
The common workaround suggested is to make sure to allways "mdadm
--zero-superblock" raid partitions/devices prior to deleting them, or to
to "just zero the entire disk between reinstallation attempts" (often
heard after bad experiences).
But partman-md should probably really watch out for/expect to see md
devices being set up, and take them into account. (list them, offering
to --stop, re-assemble as a real non-auxiliary device (not md127 and
up), --zero-superblock if needed, ...)
related:
Bug #22301
Bug #33117
Bug #569900
** Affects: partman-md
Importance: Undecided
Status: New
** Affects: partman-md (Ubuntu)
Importance: Undecided
Status: New
** Also affects: partman-md
Importance: Undecided
Status: New
--
existing raid superblocks confuse/break the install
https://bugs.launchpad.net/bugs/571653
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