Mirroring
The Mirroring page provides details and status information about remote mirror and copy volume relationships.
- Source Volume
- The name of the source volume.
- Target Volume
- The name of the target volume.
- State
- The state of the mirroring relationship:
- Copy Pending (1st pass)
- Data is being asynchronously transferred to the target volume for the first time. This state is only valid for Global Copy and Global Mirror.
- Copy Pending
- Data is being asynchronously mirrored to the target volume. This state is only valid for Global Copy and Global Mirror.
- Synchronizing
- Data is being synchronized with the target volume. This state is only valid for Metro Mirror.
- Full Duplex
- The relationship is full duplex. Synchronization is complete and the mirror is active
- Suspended
-
- By Command
- Suspended by the a command sent by an application or host. This can also occur when the relationship was created with an option to suspend when it entered a full duplex state.
- Freeze
- Remote mirror and copy processing was suspended on a volume pair because the host issued a Freeze PPRC Group order.
- Internal Conditions Both
- Remote mirror and copy processing was suspended on a volume by either the primary control unit or the secondary control unit because of internal conditions.
- Internal Conditions Target
- Remote mirror and copy processing was suspended on a secondary volume when the primary control unit was notified that the secondary volume became suspended due to internal conditions.
- Not in mirroring Relationship
- The designated volume is not part of a remote mirror and copy pair.
- Power®
- Remote mirror and copy processing was suspended on a volume when the primary or secondary
control unit was shut down or restarted.Notes:
- The paths to the secondary controller might not be available if the power to the primary
controller was shut down. If only the secondary control unit was shut down, it might be possible for
the paths to be restored depending on the path status. Use the following process to determine
whether your remote mirror and copy processing can be restored on the affected volumes:
- Enter the lspprc command and use the generated report to determine the path status.
- Enter the mkpprc command if the paths are still intact. This process resynchronizes the volume pairs.
- Continue with your processing.
- If the previous process cannot be completed, you must remove the pair relationships on the affected volumes and start your remote mirror and copy processing from the beginning on the affected volumes.
- The paths to the secondary controller might not be available if the power to the primary
controller was shut down. If only the secondary control unit was shut down, it might be possible for
the paths to be restored depending on the path status. Use the following process to determine
whether your remote mirror and copy processing can be restored on the affected volumes:
- Release Space Failure
- The pair is suspended due to the failure to release unused space-efficient storage on the Remote Mirror and Copy secondary volume.
- Remote Copy Pending
- The volume transitioned to the pending state as a result of establishing a FlashCopy® relationship. Before the attempt was made to establish the FlashCopy relationship, the volume was in Full Duplex mode.
- Simplex Target
- Remote mirror and copy processing was suspended on a volume when the secondary control unit sent a state change to the primary control unit indicating a transition to a simplex state.
- Volume Not Configured
- Remote mirror and copy processing was suspended on a volume because the volume is not part of a copy pair relationship.
- With Secondary Consistency
- The remote mirror and copy secondary volumes form a consistent data set.
- Invalid State
- A general internal error occurred when the query was processed.
- Validation Required
- The status of the volume cannot be currently determined. Further validation is required.
- Volume Inaccessible
- The volume might not be queried. This information means that the volume is fenced.
- Out Of Sync
- The number of gibibytes (GiBs) that are not synchronized for this mirroring relationship. The maximum value depends on the source volume size.
- Target Read
- Read I/O operations to the target volume are allowed by a host system.
- Target Write
- Input is allowed to the remote mirror and copy secondary volume by a host system.
- Cascade
- Indicates whether the volume is in a cascading relationship:
- Source
- The source volume of this relationship is enabled to also be a target volume of a different relationship.
- Target
- The target volume of this relationship is enabled so that it is also a source volume for a different relationship.
- blank
- The volume is not in a cascading relationship.
- Source
- The consistency group LSS ID that is associated with the source volume of the volume relationship.
- Long Busy Timeout
- The consistency group Long Busy Timeout setting for the LSS ID that is associated with the source volume of this PPRC volume relationship. This value can be modified by entering the chlss (FB) or the chlcu (CKD) command.
- Critical Mode
- Indicates whether the remote copy and mirror primary volume represents a critical volume.
- Incremental Resync
- Indicates whether incremental resynchronization is running.
- Automatic Resync
- Indicates whether the function that automatically resumes a suspended Global Copy relationship is active.