Online data movement without compromising data integrity

At a computer system including at least one processor, a computer-implemented method for modifying resiliency for at least a portion of a data store, the method comprising:

• determining that a resiliency scheme for at least a specified portion of a data store is to be changed from a first resiliency scheme to a second, different resiliency scheme, the data store including one or more portions of data;
• determining how the data within the specified portion of the data store is to be altered according to the change in resiliency scheme;
• and
• modifying the resiliency scheme of the specified portion of the data store, such that the resiliency scheme for the specified portion of the data store is changed, while the resiliency scheme for other portions of the data store is not changed.

A computer system comprising the following:

• one or more processors;
• one or more computer-readable storage media having stored thereon computer-executable instructions that, when executed by the one or more processors, cause the computing system to perform a method for modifying storage capacity within a data store, the method comprising the following:
• receiving a request to move one or more portions of data off of a first data store and on to a second data store;
• identifying which data is to be moved from the first data store to the second data store;
• creating a new allocation on the second data store, the new allocation being configured to receive at least a portion of data from the first data store;
• and
• moving the data to the new allocation on the second data store as data I/O requests are received at the first data store, such that data writes are sent to both the first and second data stores, and data reads are sent to the first data store until the data of the first data store is copied to the new allocation on the second data store.