Gmirror'd SWAP: no dump?

[Larry Rosenman]

Craig Boston wrote:
> On Thu, Jan 19, 2006 at 02:53:42PM +0000, Thomas Hurst wrote:
>>> IIRC I had the problem that 'gmirror insert' without '-h' not always
>>> inserted the slice specified by the entire block device (e.g.
>>> /dev/ad4s1 vs. /dev/ad4). Apparently there is some auto detection
>>> code and/or gmirror cannot differ correctly, but that's just a
>>> guess. Specifing '-h' fixed it in my case.
>> 
>> As I understand it, gmirror writes its metadata on the last sector of
>> the provider; when tasting devices it will look at the last sector of
>> ad4, find the metadata and use that as the provider for your mirror;
>> you can either hardcode the provider name there to override it, or
>> make the slice 1 sector smaller so gmirror tastes ad4, finds
>> nothing, then goes on to taste ad4s1 correctly.
> 
> This was fixed for most cases by adding the size of the provider to
> the metadata.  ad4 should be a different size than ad4s1 as the
> partition table has to go somewhere...
> 
> Looks like it was fixed in HEAD in Feb 2005, and MFC'd to 5.x in
> March. Shouldn't have ever been a problem for 6.x release.
> 
>
http://www.freebsd.org/cgi/cvsweb.cgi/src/sys/geom/mirror/g_mirror.c#rev1.19
.2.8
> 
Hrm.  With using the method for slices as specified on the ~rse page, I got
repeatable
lockups.

With specifying the entire disk, it works as normal, but no dump device.

Suggestions on how to enable dump, **AND** reliable boot would be
appreciated.

LER



-- 
Larry Rosenman                     http://www.lerctr.org/~ler
Phone: +1 512-248-2683                 E-Mail: ler at lerctr.org
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