Obtaining additional data storage from another data storage system

摘要

A main data storage system has a main computer-implemented storage control and data storage, and a user interface, the main storage control in communication with a local computer-implemented storage control of a local data storage system with local data storage. In response to a request to increase data storage from the user interface, the main storage control determines whether the main data storage is out of space. If so, the main storage control sends a command to the local storage control to create data space in local data storage. The local storage control creates the data space and associates the data space with the main storage control; and, in response to the local storage control creating data space in the local data storage and notifying the main storage control, the main storage control updates its metadata with respect to the data space.

主权项

1. A method for storing data with a data storage system comprising a main computer-implemented storage control and data storage, and a user interface, said main storage control in communication with a local computer-implemented storage control, the method comprising:
in response to a request to increase data storage from said user interface, said main storage control determining whether said main data storage is out of space; if said main data storage is out of space, said main storage control sending a command to said local storage control to create data space in local data storage, said data space created by said local storage control associated with said main storage control; in response to said local storage control creating data space in said local data storage and notifying said main storage control, said main storage control updating its metadata with respect to said data space; in response to said main storage control updating its metadata, said main storage control writing data from said existing volume of said main storage to said local storage controller to be written to said local data storage; and in response to a command from said user interface to rebalance data storage, and obtaining space in said main storage, said command is forwarded to said local storage control, said local storage control sends said command to said main storage control to search for storage space sufficient for said data space in said main storage.