Memory optimization for configuration elasticity in cloud environments

摘要

A system having a plurality of directors, at least some of which have a local director memory, accesses requested data by determining if requested data is in local director memory of a first one of the directors in response to an access request for the requested data by the first one of the directors. The system also determines if the requested data is native to the first one of the directors in response to the requested data not being in the local director memory of the first one of the directors, where data provided on a physical storage device coupled to the first one of the directors is native to the first one of the directors. The system also obtains the requested data from a second one of the directors in response to the requested data not being native to the first one of the directors.

主权项

1. A method of accessing data in a system with a plurality of directors, at least some of the directors including a local director memory, the method comprising:
determining if requested data is in local director memory of a first one of the directors in response to an access request for the requested data by the first one of the directors; determining if the requested data is native to the first one of the directors in response to the requested data not being in the local director memory of the first one of the directors, wherein data provided on a physical storage device coupled to the first one of the directors is native to the first one of the directors; obtaining the requested data from the physical storage device coupled to the first one of the directors and storing the requested data obtained from the physical storage device in the local director memory of the first one of the directors in response to the requested data not being in the local director memory of the first one of the directors and the requested data being native to the first one of the directors; obtaining the requested data from a second one of the directors in response to the requested data not being native to the first one of the directors; determining if the obtained requested data should be maintained in the local director memory of the first one of the directors in accordance with a criterion related to a characteristic of the data; and in response to determining that the obtained requested data should be maintained in the local director memory of the first one of the directors, notifying other ones of the directors, wherein each of the other ones of the directors updates a list of directors that are storing, in director memory thereof, a copy of data.