IV44516: VARYONVG COREDUMPS WHEN IMPORTING FLASHCOPIED ASYNC MIRRORED VG APPLIES TO AIX 7100-02

APAR status

• Closed as program error.

Error description

• varyonvg can fail when varying on a VG used for async
  glvm where the mirror pool that the cache LV is defined
  on no longer exists on any PVs.
  
  This would most commonly be expected if an async glvm
  LV and it's cache LV were mirrored to an extra disk, and
  that disk was then used to force a recreatevg from just
  the one disk for backup purposes.  In this case, when
  recreatevg runs import/varyonvg, that would fail like:
  # recreatevg -y glvg1_c1 -f hdisk3
  The assert subroutine failed: mp->mp_id == mp_id, file
  asyncmp.c, line 852
  /usr/sbin/importvg[596]: 7143532 IOT/Abort trap(coredump)
  0516-780 importvg: Unable to import volume group from
  hdisk3.
  0516-1320 recreatevg: Unable to recreate volume group.
  

Local fix

Problem summary

• varyonvg can fail when varying on a VG used for async glvm
  where the mirror pool that the cache LV is defined on no longer
  exists on any PVs.
  
  This would most commonly be expected if an async glvm LV and
  it's cache LV were mirrored to an extra disk, and that disk was
  then used to force a recreatevg from just the one disk for
  backup purposes.  In this case, when recreatevg runs
  import/varyonvg, that would fail like:  # recreatevg -y
  glvg1_c1 -f hdisk3 The assert subroutine failed: mp->mp_id ==
  mp_id, file asyncmp.c, line 852 /usr/sbin/importvg 596 :
  7143532 IOT/Abort trap(coredump) 0516-780 importvg: Unable to
  import volume group from hdisk3.  0516-1320 recreatevg: Unable
  to recreate volume group.
  

Problem conclusion

• Correct checks of mirror pools for async glvm cache lv in the
  varyonvg code to allow for this possibility of recreating or
  varying on a vg when not all of the mirror pools that the
  cachelv has assigned exist in the VG at this time.
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

  IV46350 IV46390 IV48431 IV48727 IV49579

Fix information

• Fixed component name

  AIX V7.1

• Fixed component ID

  5765H4000

Applicable component levels

• R710 PSY

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