If power is removed from the primary or secondary storage system and its backup batteries are fully discharged while data volume pairs are split, differential data (i.e., update data) will not be retained. In this unlikely case, the primary or secondary storage system assumes all the suspended data volumes are updated. If you restore the data volume pairs at the primary site, all the primary data volumes will be copied to the secondary data volumes.
When the Power is Removed from Network Relay Devices
If power is removed from a network relay device during remote copy operations, the primary and secondary storage systems assume that a failure occurs, and then split all data volume pairs.
Turning Off Power Intentionally
This section explains what should be noted when you power off storage systems or network relay devices intentionally.
When You Power Off the Primary Storage System
If you want to power off the primary storage system during remote copy operations, you must ensure, before powering off the storage system, that all data volume pairs or mirrors (i.e., pairs of journal groups) are split, and that the status of all the data volume pairs is Suspend.
If more than one primary and secondary storage systems are used with extended consistency groups, you must split all data volume pairs in the extended consistency groups before powering off the primary storage systems. When powering off the primary storage systems, you must power off the supervisor DKC first, and then the subordinate DKCs.
Caution: If you want to power off the primary storage system, please contact your Hitachi account team and ask them to power off the storage system.
If data volume pairs are split and the primary storage system is powered off as mentioned above, you can resume remote copy operations by taking the following steps:
1.Power on the primary storage system.
If more than one primary storage system is to be used with extended consistency groups, power on the subordinate DKCs first, and then the supervisor DKC.
2.If the primary storage system is ready to resume remote copy operations, please restore the data volume pairs that have been split, and then confirm that the status of the data volume pairs is Pending duplex or Duplex. This operation must be performed at the primary site.
Chapter 5 Configuring Storage Systems and Logical Paths |
