Global Mirror Either Direction with Site 3 Global Copy commands
Use this information to learn about commands available for Global Mirror Either Direction with Site 3 Global Copy sessions. To issue a command, go to and click the command.
| Command | Action |
|---|---|
| Enable Copy to Site 1 | Run this command and confirm that you want to reverse the direction of replication before you reverse the direction of copying in a Global Mirror Either Direction session. After you issue this command, the Start H2->H1 command becomes available. |
| Enable Copy to Site 2 | Run this command and confirm that you want to reverse the direction of replication before you reverse the direction of copying in a Global Mirror Either Direction session. After you issue this command, the Start H1->H2 command becomes available. |
| StartGC H1->H2 |
Establishes Global Copy relationships between site 1 and site 2 and begins asynchronous data replication from H1 to H2. To change the session state from Preparing to Prepared, you must issue the Start H1->H2 command and the session must form consistency groups. There is no disaster recovery protection for Global Copy relationships. If a disaster such as the loss of a primary storage system or a link failure between the sites occurs, the session might be inconsistent when you issue the Recover command. This command is available for the DS8000® storage system. |
| StartGC H2->H1 |
Establishes Global Copy relationships between site 1 and site 2 and begins asynchronous data replication from H2 to H1. To change the session state from Preparing to Prepared, you must issue the Start H2->H1 command and the session must form consistency groups. There is no disaster recovery protection for Global Copy relationships. If a disaster such as the loss of a primary storage system or a link failure between the sites occurs, the session might be inconsistent when you issue the Recover command. This command is available for the DS8000 storage system. |
| Start H1->H2 | Starts copying data from H1 to H2 in a Global Mirror Either Direction session. Establishes the necessary relationships in the session and begins the process necessary to start copying data from the H1 site to the H2 site and to start forming consistency groups. |
| Start H2->H1 | Starts copying data from H2 to H1 in a Global Mirror Either Direction session. Establishes the necessary relationships in the session and begins the process necessary to start copying data from the H2 site to the H1 site and to start forming consistency groups. |
| StartGC H2->H3 | Establishes Global Copy relationships between site 2 and site 3 creating cascaded asynchronous data replication from H2 to H3. The data at site 3 is not consistent. To create consistent data at site 3, a FailoverH3 command needs to be issued, or a consistent suspension of the site 1 to site 2 copy followed by draining the site 2 to site 3 replication. |
| StartGC H1->H3 | Establishes Global Copy relationships between site 1 and site 3 creating cascaded asynchronous data replication from H1 to H3. The data at site 3 is not consistent. To create consistent data at site 3, a FailoverH3 command needs to be issued, or a consistent suspension of the site 2 to site 1 copy followed by draining the site 1 to site 3 replication. |
| Suspend | The Suspend command pauses the formation of consistency groups after the current consistency group is formed which creates a consistent data set on the secondary volumes. |
| Recover | Issue this command to recover the session to the target site. This command performs the steps necessary to make the target host volumes consistent and available for access as the new primary site. After this command completes, the session state becomes Target Available. Do not access H2 volumes until the Recover command is completed and the session displays Target Available and Recoverable. A Recover to H2 also establishes a point-in-time copy to J2 to preserve the last consistent data. |
| SuspendH2H3 | The SuspendH2H3 command waits until all out of sync tracks are copied from the H2 volume to the H3 volume and then suspend all relationships between site 2 and site 3. If the site 1 to site 2 replication was suspended consistently, then site 3 must be consistent. |
| SuspendH1H3 | The SuspendH1H3 command waits until all out of sync tracks are copied from the H1 volume to the H3 volume and then suspend all relationships between site 1 and site 3. If the site 2 to site 1 replication was suspended consistently, then site 3 must be consistent. |
| FailoverH3 | The Failover command is available from the Prepared state and automatically pauses consistency group formation consistently, drain the out of sync tracks to site 3, fail over the relationships at site 3, and then restart consistency group formation. This command can be called to create a consistent copy of the data at site 3 to take a Safeguarded Copy backup, a FlashCopy® backup, or to test the data at site 3. |
| Terminate | Removes all physical copies and relationships from the hardware
during an active session. If you want the targets to be data consistent before you remove their relationship, you must issue the Suspend command, the Recover command, and then the Terminate command. |
| Free Journal Space | Frees up journal space by deleting the FlashCopy relationships from the hardware. The Free Journal Space command is only available after a recover operation is issued on the Global Mirror leg of the selected session. |
| Set Production to Site 1 | Sets the production volume to be at Site 1 from the Defined state. |
| Set Production to Site 2 | Sets the production volume to be at Site 2 from the Defined state. |