You can confirm the volume pairs that are used for a disaster
recovery failback operation. The failback operation copies all modified
tracks from a target volume to a source volume.
Before you begin
You must first create a remote mirror and copy volume pair.
Before you run the failback operation, the volumes must be full-duplex.
You must create
mirroring connectivity (previously known
as paths) between the LSSs from the target site to the source
site and from the source to the target site.
About this task
When you are ready to return to Site A (your production
site), use the failback operation (on the Volume A-Volume B pair)
from Site B (your recovery site). This process makes the target volume
(Volume B) transition to a source and the original source volume (Volume
A) transition to a new target volume. The process resynchronizes the
volumes at Site B with the volumes at Site A. At Site B, ensure that
the failback process is complete and that the volume pair is duplex.
Procedure
Complete the following steps from the DS Storage Manager to
confirm the volume pairs in which a failback operation is run.
- In the navigation, select . Select the volume pair in which the failover
operation was run. The status of the volume pair should
display as suspended.
- Select Recovery Failback from the Action menu and then click OK. The Recovery Failback window displays
the volume pairs for the failback process. The status of the volume
pairs should display as suspended.
- Optional: Click Advanced
Options to update options for the Metro Mirror or Global
Copy relationship before you run the recovery failback.
Options
include:
- Reset reservation
- Clears any host reservations on the target volume of the pair.
This option is only available for FB volume pairs.
- Suspend Metro Mirror relationship after initial copy
- Automatically suspends the Metro Mirror relationship after the
relationship is created. This option is only valid for Metro Mirror
volume relationships.
- Cascading
- Specifies that the remote mirror and copy target volume can also
serve as a source volume for a different remote mirror and copy volume
relationship.
- Permit read access from target
- Enables hosts to read from the Metro Mirror target volume. For
the host to read the volume, the state of the Metro Mirror pair must
be full-duplex. This option is only valid for FB volumes.
- Create relationships even if target is online to a host
- Establishes a Metro Mirror volume relationship even if the target
volume is online to the hosts. This option is only valid for S/390® or CKD volumes.
- Enable critical volume mode
- Determines how write operations are managed when an error occurs
on a volume pair. The volume pair remains suspended until you correct
the problem and either resynchronize or delete the volume pair.
- Disable auto-resync
- Disables the auto-resync function for the Global Copy pair. This
option is available when at least one of the selected relationships
is a Global Copy relationship. Every time the Global Copy pair is
established or resynchronized, you must either enable or disable auto-resync.
This control does not affect Metro Mirror relationships.
After you select the appropriate options, click
OK to
return to the
Recovery Failback window.
- Click OK to complete the process.
Otherwise, click Cancel and your selection
is canceled and the page closes.