Patent ID: 9063945
Filing Date: 2015-06-23
Classification: G06F

Abstract:
1. A method to copy data, comprising: identifying by a peer-to-peer remote copy (PPRC) agent disposed in a host computer in communication with a first data storage system a data track to be replicated using an asynchronous peer-to-peer remote copy (PPRC) operation, wherein the data track is encoded in a non-transitory computer readable medium disposed in said first data storage system; at a first time, determining by said PPRC agent whether the data track is stored in a data cache; when said data track is not stored in said cache, staging by said PPRC agent said data track in said cache; at a second time, replicating by said PPRC agent the data track from the data cache to a non-transitory computer readable medium disposed in a second data storage system, wherein the second time is later than the first time; if the data track was stored in the data cache at the first time, instructing by said PPRC agent a cache manager to maintain the position of the track in a LRU list that the track would normally have occupied due to normal system operations; and if the data track was not stored in the data cache at the first time, instructing by said PPRC agent the cache manager that the data track may be demoted.