Re: Raidctl -u ought to turn off autoconfigure on the target raid set

[buhrow%lothlorien.nfbcal.org@localhost (Brian Buhrow)]

        Hello.  OK.  I guess I conceed the point.  Perhaps a change to the
manual to document that raidctl -u doesn't wipe the component labels so
folks will know to expect this behavior.  
-Brian

On Aug 26,  2:03pm, Greg Oster wrote:
} Subject: Re: Raidctl -u ought to turn off autoconfigure on the target raid
} Manuel Bouyer writes:
} > On Tue, Aug 26, 2008 at 09:54:44AM -0700, Brian Buhrow wrote:
} > >   Hello.  I'm not sure if I should file this as a PR or simply make the
} > > suggestion on the mailing lists.
} > >   When raidctl -u is run against a raid set which has auto-configure
} > > turned on, it really ought to first turn off autoconfigure on that raid 
set
} > > before it unconfigures the raid set.  Otherwise, if you reboot the system,
} > > the old raid set becomes a participant in the night of the living dead.
} > > This can be a problem if you're trying to migrate from one image to 
another
} > > by breaking a mirrored raid set, putting a new image on one of the disks,
} > > configuring a new raid set with the newly imaged disk as the working
} > > component, then rebooting to that new image and adding  the disk with the
} > > old image to the new raid set and thus completing your upgrade.  When you
} > > reboot, if the old disk is part of the original mirrored raid set, and the
} > > new disk is part of a new raid set, you automatically boot to the old 
image
} > > again.  Also, while it's possible to run raidctl -A no manualy before
} > > unconfiguring the raid set, it would be nice not to have to remember that
} > > step, or discover that you forgot it the hard way.
} > 
} > If you really want to remove it permanently, just do
} > raidctl -A no ...
} > becore
} > raidctl -u ...
} > 
} > It can be handy to temporary unconfigure a raid device, and have it show
} > up again after reboot.
} 
} "What he said."  Perhaps a "raidctl -U" (for "Unconfigure and wipe 
} component labels") would be more useful for what you want...  
} Of course, that starts getting dangerous in terms of what can get nuked 
} by a simple mistake... 
} 
} Later...
} 
} Greg Oster
} 
} 
>-- End of excerpt from Greg Oster