Figure 52 Copy-group suspension due to a timeout
In the above diagram, the specified ATTIME suspend time is 10:00:00 and the specified
timeout time is 10 minutes, so:
1. The data in the 09:50:00 update journal is reflected into the volume at the secondary
site, because the ATTIME suspend time (10:00:00) has not been reached yet.
2. If an update journal or a no-update journal is not detected during the timeout time following
the ATTIME suspend time, the copy group suspension begins.
In this case, a backup with the time specified cannot be acquired correctly, because the
09:59:58 update has not been reflected into the volume at the secondary site. If copy-group
suspension is executed because the timeout time has expired, the YKZ409E message will be
output when you execute the YKQUERY or YKEWAIT command for the BC Z copy pair after
suspension.
CAJ ATTIME Suspend Function: Recommendations for Backing Up Multiple Generations
If you resynchronize the BC Z copy group to move it into the DUPLEX status, the S-VOLs of the BC
Z copy group cannot be used as a volume for recovery until the BC Z copy group is suspended.
Recovery may not be possible from a Cnt Ac-J Z S-VOL; therefore, HP recommends that you prepare
BC Z copy groups for two or three generations and always have one of these generations in the
suspend status for use in recovery.
When backing up multiple generations, you can manage those generations by using generation
IDs. If you set a different generation ID each time you back up a copy group, recognizing copy
groups that were backed up across multiple storage systems at the same time will be easier.
Differences in functionality between NORMAL ATTIME and CAJ ATTIME Suspend
function
Table 22 (page 90) describes differences in functionality between the NORMAL ATTIME suspend
function and the CAJ ATTIME suspend function.
The Specified Time Suspend Function 89
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