Performing Online Data Migration With Concurrent Active User Access to the Data

摘要

A network server migrates dataset blocks from a source storage device to a target storage device while continuing to service user requests for the data stored in the dataset blocks. A control driver executing at the network server tracks the location of the dataset blocks during the data migration as being at either the source storage device or the target storage device. Upon receiving a user request for the data, the control driver uses the tracking information to determine whether the dataset blocks associated with the requested data have been migrated to the target storage device or are still stored at the source storage device. The control driver then retrieves the data associated with the requested dataset blocks from the determined source or target storage device.

主权项

1. A method performed at a network server, the method comprising:
in a data migration mode, migrating a plurality of dataset blocks from a source storage device to a target storage device, wherein the source and target storage devices are communicatively connected to the network server via a communications network; receiving a data request while migrating the plurality of dataset blocks; determining a current memory location for a dataset block comprising requested data responsive to receiving the data request, wherein the current memory location is at the source storage device if the dataset block has not been migrated, and at the target storage device if the dataset block has been migrated; and retrieving the dataset block comprising the requested data from the current memory location while migrating the plurality of dataset blocks.