gmirror on slices & glabel mess

[Lev Serebryakov]

Hello, Freebsd-geom.


 I have two identical HDDs with one slice on each -- ad4s1 & ad6s1.
 These two slices have identical labels:

rescue# bsdlabel ad4s1
#        size   offset    fstype   [fsize bsize bps/cpg]
  a:  4194304       16    4.2BSD        0     0     0
  b: 33554432  4194320      swap
  c: 1465149105        0    unused        0     0         # "raw" part, don't edit
  d: 33554432 37748752    4.2BSD        0     0     0
  e:  2097152 71303184    4.2BSD        0     0     0
  f: 134217728 73400336    4.2BSD        0     0     0
  g: 209715200 207618064    4.2BSD        0     0     0
  h: 1047815841 417333264    4.2BSD        0     0     0
rescue# bsdlabel ad6s
#        size   offset    fstype   [fsize bsize bps/cpg]
  a:  4194304       16    4.2BSD        0     0     0
  b: 33554432  4194320      swap
  c: 1465149105        0    unused        0     0         # "raw" part, don't edit
  d: 33554432 37748752    4.2BSD        0     0     0
  e:  2097152 71303184    4.2BSD        0     0     0
  f: 134217728 73400336    4.2BSD        0     0     0
  g: 209715200 207618064    4.2BSD        0     0     0
  h: 1047815841 417333264    4.2BSD        0     0     0


   All partitions but "b" are groupd to form mirrors with names
 rootfs, var, tmp, usr, databases, home respectively.

   File systems with labels are created on each mirror device. Labels
 are the same as mirror device names.

   When system boots WITHOUT geom_mirror loaded (rescue system)
 "geom_label" sees LAST fs (home):

 rescue# ls /dev/ufs
 home
 rescue#

   If geom_mirror is loaded, it adds "/dev/ufs/home" instead of
 "/dev/ad4s1h" and filesystem CAN NOT BE MOUNTED from "/dev/ufs/home".

   It is 100% reproducible on virtual machine (With much smaller
 virtual disks, than my example).

-- 
// Black Lion AKA Lev Serebryakov <lev at serebryakov.spb.ru>