Thin Image pair status
The HTI pair status changes as you create, split, or perform other pair tasks.
The following workflow shows the HTI pair status changes:
You choose two volumes that are in SMPL status and are not in use as an HTI pair.
You create a pair. If the primary volume has not previously been paired with any secondary volume, the pair status changes to “COPY” at first, and then to “PAIR” after the pair creation finishes.
Creation of an HTI pair may be time consuming if you create a pair immediately after deleting the last snapshot data for the primary volume.
If the pool threshold is exceeded when the HTI pair is in “PAIR” status, the pair status changes to “PFUL.”
HTI pairs cannot be created when the pool threshold is exceeded.
Snapshot data is stored when you split the pair in “PAIR” status. After snapshot data is stored, the pair status is “PSUS.” If the pool threshold is exceeded when the HTI pair is in “PSUS” status, the pair status changes to “PFUS.”
If you only want to delete snapshot data but do not want to release the HTI pair, you delete the snapshot data for the pair in “PSUS” or “PFUS” status.
If you restore an HTI pair in “PSUS” status, snapshot data is overwritten to the primary volume. The pair status is “RCPY” when the restore process is in progress. The pair status is “PAIR” after the restore process finishes.
The pool can only contain data of predetermined capacity. If the total capacity of snapshot data in the pool exceeds the pool capacity, the status of the HTI pair becomes “PSUE.” In addition, the pair status changes to “PSUE” if a failure occurs during the restore process or if the pool usage rate reaches 100 percent. Even if the restore process is not in progress, the pair status may change to “PSUE” when a failure occurs.