unable to umount /mnt/usr device busy

  AIX 4.1.4
  RISC 7012

  Customer was doing 5 network boots using sysback and installing
  from a file image.  It failed on all 5 systems with a message
  of unable to umount /mnt/usr  device busy

  I had the customer choose the option to perform maintenance mode
  /etc/umount /dev/hd2  (same error as above)
  I tried any combos of this command getting the same error messages
  I did a ps -eaf 
    There was a sleep, sysmain (3 of them) running
  I could not kill the sleep, but was able to kill the parent process
  of the sleep, which was one of the sysmain.
  Now /dev/hd2 will unmount
  exit  (the install process continue without errors)

Next Action:
  Closing with customer approval

Support Line: unable to umount /mnt/usr device busy ITEM: CI5830L
Dated: December 1996 Category: N/A
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