Patent ID: 8250323

Claim:
A method, comprising: transferring writes to a primary storage to a secondary storage in a mirror copy relationship; establishing a logical copy of the secondary storage as of a point-in-time; storing writes to data in the logical copy, received from the primary storage during a logical copy duration after the point-in-time, in a repository that comprises less storage space than the secondary storage; suspending the transferring of writes to the secondary storage, wherein during the suspension writes to the primary storage are indicated in an out-of-synch data structure; in response to ending the suspension of the transferring of writes from the primary to the secondary storages, determining whether available storage space in the repository is sufficient to store writes transferred from the primary storage while transferring the writes from the out-of-synch data structure; and using the repository to store data in the secondary storage as of the point-in-time that is to be updated by writes transferred from the primary storage following the ending of the suspension in response to determining that the available storage space in the repository is sufficient to store writes transferred from the primary storage while transferring the writes indicated in the out-of-synch data structure.