text: The following numbers correspond to the numbers that are shown in Figure 11-91 on 
  page 527: 
  
  (cid:2) (1) The first write is performed from the host to LBA X. 
  
  (cid:2) (2) The host is provided acknowledgment that the write completed even though the 
  mirrored write to the auxiliary volume is not yet complete. 
  
  (cid:2) (1’) and (2’) occur asynchronously with the first write. 
  
  (cid:2) (3) The second write is performed from the host also to LBA X. If this write occurs before 
  (2’), the write is written to the journal file. 
  
  (cid:2) (4) The host is provided acknowledgment that the second write is complete. 
  
  **Delay simulation**
  Global Mirror provides a feature that enables a delay simulation to be applied on writes that 
  are sent to the auxiliary volumes. With this feature tests can be done to detect colliding writes, 
  also it provides the capability to test an application before the full deployment. The feature can 
  be enabled separately for each of the intracluster or intercluster Global Mirrors. 
  
  By using the**chsystem**command, the delay setting can be setup and with the**lssystem**
  command the delay can be checked. The gm_intra_cluster_delay_simulation field 
  expresses the amount of time that intracluster auxiliary I/Os are delayed. The 
  gm_inter_cluster_delay_simulation field expresses the amount of time that intercluster 
  auxiliary I/Os are delayed. A value of zero disables the feature. 