Update copy workflow

Update copy is performed to asynchronously copy new data (differential data) from the P-VOL of a copy volume to the S-VOL.

The storage system goes through the following process to create an update copy:

1. The storage system marks I/O to the P-VOL in PAIR status as differential data and stores the location of the data in bitmaps for transfer to the S-VOL.
2. After there are write I/O operations to a P-VOL, the storage system starts the update copy operation.
   NoteThe timing of the update copy operation is based on the amount of differential data that accumulates and the elapsed time since the previous update.

The following image shows the update copy operation.

Parent Topic

• Initial copy workflow