Date: Wed, 15 Oct 2003 14:34:09 +0930 From: Greg 'groggy' Lehey <grog@FreeBSD.org> To: aarong <aarong@megapathdsl.net> Cc: freebsd-questions@freebsd.org Subject: Re: clearing Vinum configurations Message-ID: <20031015050409.GH13080@wantadilla.lemis.com> In-Reply-To: <F3834D06-FC17-11D7-B107-000393A364C4@megapathdsl.net> References: <F3834D06-FC17-11D7-B107-000393A364C4@megapathdsl.net>
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On Saturday, 11 October 2003 at 11:23:03 -0700, aarong wrote:
> I've been toying with Vinum extensively these past few weeks, on 4.8,
> and I've yet to come across a way to effectively and *completely* clear
> a Vinum configuration. After creating a configuration, Vinum stores the
> configuration on the drive or drives and resetconfig does not clear
> that written config. Case in point, after reinstalling FreeBSD on a
> primary drive, Vinum started up and read the previous installs
> configuration from the second drive which had not been formatted. On
> another install, I tried zeroing out the 265 Vinum sectors found 16
> sectors in on the primary drive, but was greeting with a "missing
> operating system" on reboot.
I'm going to need more information on this. It doesn't correspond at
all with my experience. Here's an example:
vinum -> l
7 drives:
D mytest7 State: up /dev/da6s4h A: 3070/4094 MB (=
74%)
D mytest6 State: up /dev/da5s4h A: 0/4094 MB (0%)
D mytest5 State: up /dev/da4s1h A: 0/4094 MB (0%)
D mytest4 State: up /dev/da3s4h A: 0/4094 MB (0%)
D mytest3 State: up /dev/da2s4h A: 0/4094 MB (0%)
D mytest2 State: up /dev/da1s4h A: 0/4094 MB (0%)
D mytest1 State: up /dev/da0s4h A: 0/4094 MB (0%)
=20
...
=20
vinum -> resetconfig
WARNING! This command will completely wipe out your vinum configuration.
All data will be lost. If you really want to do this, enter the text
=20
NO FUTURE
Enter text -> NO FUTURE =
Vinum configuration oblitera=
ted
vinum -> start
** no drives found: No such file or directory
vinum -> l
0 drives:
0 volumes:
0 plexes:
0 subdisks:
> Two questions:
>
> 1) why doesn't resetnconfig clear all the configurations,=20
As far as I know, it does.
> including the ones written to Vinum drives?
I'm not sure I understand. Do you mean "and not just in memory"?
Yes, it does that.
> 2) why doesn't dd if=3D/dev/zero of=3D/dev/da0 seek=3D16 count=3D265 work?
> What's in those 265 sectors that I can't touch?
The second sector on the disk is protected. You can't write to it.
If you start at sector 2, it will work.
The Vinum label is at sector 8. That's the only sector you need to
clear to manually obliterate a Vinum configuration.
Greg
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