Hand on gmirror (Was: Re: gmirror bugs, how many?)

[Pawel Jakub Dawidek]

On Mon, Nov 29, 2004 at 12:52:40PM -0200, Jo?o Carlos Mendes Luís wrote:
+> >+>     Indeed, the -h option is what I wanted and the "bug" is in the 
+> >+> manual. What would happen if I change the disc ID in this case?
+> >
+> >Your disk will not be detected as a mirror component, because hardcoded
+> >name is different.
+> 
+> Oops.  Is there a check for that?  For example, let's say that ad0s1 got 
+> renamed to ad1s1, and hardcoded a reference to ad0s1.  In this case, 
+> there is a disk called ad0s1 in the system.  Is gmirror smart enough in 
+> this case?

In this case ad1s1 will not be connected to the mirror (but don't worry,
ad0s1 will not be connected as well).

+> >+> sigesc::root jcmendes [553] disklabel mirror/vol0
+> >+> # /dev/mirror/vol0:
+> >+> 8 partitions:
+> >+> #        size   offset    fstype   [fsize bsize bps/cpg]
+> >+>   a: 16498864       16    unused        0     0
+> >+>   c: 16498880        0    unused        0     0         # "raw" part, 
+> >+> don't edit
+> >+> sigesc::root jcmendes [554]
+> >+> 
+> >+>   Seems good until now.  Except for the offset 16 of the "a" partition. 
+> >+>  Is this necessary?  The man page says that the only sector reserved 
+> >+> for metadata is the provider's last one.
+> >
+> >Ehh, "blame" disklabel(8). First 16 sectors are reserved for boot code.
+> 
+> And why this does not happen with ad0s1, etc?

I think it should, only using sysinstall for this will not allocate those
sectors. Anyway, it has nothing to do with gmirror.

-- 
Pawel Jakub Dawidek                       http://www.FreeBSD.org
pjd at FreeBSD.org                           http://garage.freebsd.pl
FreeBSD committer                         Am I Evil? Yes, I Am!
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