Mounting from ufs:/dev/mirror/gm0s1a failed with error 19

[Dino Vliet]

Dear FreeBSD userlist,2 or 3 years ago I tried to upgrade to freebsd 9.1 through source and as a consequence my gmirrorhas been broken because I ended up with a broken mirror and don't know how to fix it.
Mounting from ufs:/dev/mirror/gm0s1a failed with error 19.
Loader variables:
  vfs.root.mountfrom=ufs:/dev/mirror/gm0s1a
  vfs.root.mountfrom.options=rw

Manual root filesystem specification:

  <fstype>:<device> [options]
      Mount <device> using filesystem <fstype>
      and with the specified (optional) option list.

    eg. ufs:/dev/da0s1a
        zfs:tank
        cd9660:/dev/acd0 ro
          (which is equivalent to: mount -t cd9660 -o ro /dev/acd0 /)

  ?               List valid disk boot devices
  .               Yield 1 second (for background tasks)
  <empty line>    Abort manual input

I found this on internet:
gmirror broken after upgrade | The FreeBSD Forums

And at the loader prompt I did this:

set kern.geom.part.check_integrity=0
boot

And was able to boot but where I'm stuck is that according to that link I should redo the mirror according to this 18.3. RAID1 - Mirroring but how do I proceed exactly if I don't want to loose my data?

So where do I start exactly?


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| gmirror broken after upgrade | The FreeBSD Forums Hello. I have upgraded a friend's machine running gmirror from 8.0 to 8.1 successfully, but trying to upgrade to 10-RELEASE. I think there may be a... |
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| 18.3. RAID1 - Mirroring 18.3. RAID1 - Mirroring RAID1, or mirroring, is the technique of writing the same data to more than one disk drive.  |
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