Parallels v4 regression (aka ada(4) oddity) in RELENG_9

[Garrett Cooper]

On Mon, Jan 23, 2012 at 10:18 AM, Devin Teske <devin.teske at fisglobal.com> wrote:
>
>> -----Original Message-----
>> From: Garrett Cooper [mailto:yanegomi at gmail.com]
>> Sent: Monday, January 23, 2012 10:16 AM
>> To: Devin Teske
>> Cc: freebsd-hackers at freebsd.org
>> Subject: Re: Parallels v4 regression (aka ada(4) oddity) in RELENG_9
>>

...

>>     The 'bug' is in gpart/geom and the 'issue' is present in prior
>> versions of FreeBSD. The backup partition is now more of a thorn in
>> everyone's side than previous versions. gpart delete'ing all the
>> partitions, then doing gpart destroy is probably what you want (there
>> isn't a simple one-liner that would do this).
>
> So "dd if=/dev/zero of=/dev/ada0 bs=512k count=256" is not enough to wipe out
> "the backup partition" (presumably created by prior-usage of bsdinstall
> guided/auto partitioning)??

    The backup partition sits at the back of the disk, so yes that dd
by itself won't work.
Thanks,
-Garrett