Switching Operations to the Secondary Site
If a disaster or failure occurs at the primary site, the first disaster recovery activity is to use Business Continuity Manager to switch your operations to the remote backup site.
The basic procedures for switching operations to the remote backup site are as follows:
Note: If you need to perform an IPL of the secondary host system, please delete SIMs and then perform the IPL before following the procedure below. When the IPL finishes, the secondary data volumes will usually be varied online. If the secondary volume are not varied online, vary the volumes online.
Note: If you do not need to perform an IPL of the secondary host system, please ensure that the secondary data volumes are varied online before you follow the procedure below.
1.Check whether the restore journal group includes a secondary data volume whose pair status is Pending duplex or Suspend (equivalent to SUSPOP in Business Continuity Manager).
If such a pair exists, consistency in the secondary data volume is dubious, and recovery with guaranteed consistency is impossible. In this case, if you want to use the secondary data volume, you must release the pair.
2.If such a pair does not exist, use Business Continuity Manager to execute the YKSUSPND REVERSE option on the restore journal group (YKSUSPND is a command for splitting a pair).
If an error occurs, consistency in the secondary data volume is dubious, and recovery with guaranteed consistency is impossible. In this case, if you want to use the secondary data volume, you must release the pair.
3.If no error occurs in step 2, wait until the splitting finishes. When the splitting finishes, the secondary data volume becomes usable with maintained consistency.
4.When the splitting finishes, use Business Continuity Manager to execute the YKRESYNC REVERSE option on the restore journal group (YKRESYNC is a command for restoring a pair). This option attempts to restore the pair and reverse the primary/secondary relationship.
5.Check whether there is a pair whose pair status of the restore journal group is Suspend (equivalent to SWAPPING in Business Continuity Manager).
If such a pair does not exist, the pair is successfully restored and the copy direction is reversed, and then copying of data from the secondary site to the primary site will start.
Chapter 10 Usage Scenarios |
