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<box 100% blue | List DS disks:>

[root@p550-vios1]/home/padmin# mpio_get_config -A
  Storage Subsystem worldwide name: 608e500243e2a00004ea82030
  Storage Subsystem Name = 'LUDS3512'
      hdisk#           LUN #   Ownership          User Label
      hdisk14              0   B (preferred)      TEST
  Storage Subsystem worldwide name: 608e5002ecb2c000050349b11
  Storage Subsystem Name = 'LUDS3524'
      hdisk#           LUN #   Ownership          User Label
      hdisk4               0   A (preferred)      nimsrv_b1
      hdisk5               1   B (preferred)      nimsrv_d1
      hdisk6               2   A (preferred)      tsmaix_b1
      hdisk7               3   B (preferred)      tsmaix_d1
      hdisk8               4   A (preferred)      monitor_b1
      hdisk9               5   A (preferred)      repmon_b1
      hdisk10              6   B (preferred)      repmon_d1
      hdisk11              7   A (preferred)      gpfs_aix_test_1
      hdisk12              8   B (preferred)      monitor1_b1
      hdisk13              9   A (preferred)      monitor2_b1
      hdisk15             10   B (preferred)      tsmaixbeta_b1
      hdisk16             11   A (preferred)      tsmaixbeta_d1

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<box 100% blue | Concurrent access on dual VIOS for DS disks:>

# chdev -dev hdisk22 -attr reserve_policy=no_reserve  (as padmin)
or 
# chdev -l hdisk22 -a reserve_policy=no_reserve  (as root)

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