Bug#691668: raid10 "far" layouts can be started without enough drives being available

[Michael Tokarev]

Package: mdadm
Version: 3.2.5-3
Severity: important
Tags: upstream patch

When raid10 with "far" layout is being assembled, it can be started when
not enough component devices are available.  This is especially important
with incremental device assembly (which is not supported on Debian still),
but can also happen when some devices are failed.

This can possible lead to various "fun" situations including data corruption.

It is fixed upstream in the next (stable/bugfix) version of mdadm, 3.2.6,
by this commit:

 http://git.neil.brown.name/git?p=mdadm.git;h=2117ad1dd1b79cf6d02a065d9e38076aa9f4788d

/mjt