Trials and tribulations on mirroring....

[Karl Denninger]

Thanks.... that should do the trick (and explains why it fails....)

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On Wed, Jan 19, 2005 at 12:10:14AM -0600, Jon Noack wrote:
> On 01/18/05 23:46, Karl Denninger wrote:
> > <snip backstory and gvinum stuff>
> > 
> > So, my next attempt (with a new, fresh load) was to give gmirror a shot
> > instead, since I only need Raid 1, and this looks like a "better" option
> > from that perspective given gvinum's squirrely and not-all-there status at
> > the moment.
> > 
> > Weeeeellll.. the manual page (and the archives on the list here) implies that 
> > I can do the following:
> > 
> > 1. Set up the system on one of the two mirror disks.
> > 
> > 2. In single user mode, use "gmirror label -v -b round-robin disk ad4"
> >    to set up the pre-existing disk (with data on it), which I booted from,
> >    as the "primary".
> > 
> > 3. Then use "gmirror insert disk ad6" to add the secondary (mirrored) disk,
> >    which will automatically sync it and bring them into a consistent state.
> > 
> > Only one small problem - the first command (in #2) fails, with:
> > 
> > "Can't store metadata on ad4: Operation not permitted"
> > 
> > This is true if the system is mounted read-only (in single user mode) or
> > read-write (in multiuser, with all filesystems mounted)
> > 
> > Attempting to label the SECOND (bare) disk works, but of course that's 
> > backwards and an "insert" would immediately destroy the running system (I
> > assume it would also fail with the same permission error, but I've not tried
> > it) - so that's not an option.
> > 
> > I also tried it from the fixit disk, but the KLD cannot be loaded from the
> > fixit disk, and none of the commands work - so that appears to not be an 
> > option either.
> > 
> > How do you get this thing set up?  The archives here (and man pages) 
> > strongly imply that this works for a root filesystem and boot drive - 
> > what am I missing?
> > 
> > Need a Raid 1 solution that works to move over to the 5.x world out here...
> 
> If any filesystem is mounted then GEOM will not allow metadata updates 
> for the drive.  Here's a solution given over on the geom@ list:
> http://lists.freebsd.org/pipermail/freebsd-geom/2004-November/000379.html
> 
> I converted to gmirror from ataraid, so I already had 2 disks with 
> identical contents.  I worked around this problem as outlined here (the 
> instructions have errors that are corrected later in the thread):
> http://lists.freebsd.org/pipermail/freebsd-current/2004-October/039907.html
> 
> I wish we handled this in the installer, but as I can't produce the code 
> to do it I'll shut up now...
> 
> Jon
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