SELECTIVE WRITE CONTROL

摘要

Provided are a computer program product, system, and method for selective write control in accordance with the present description. In one aspect, a write operation which is associated with a read operation, may be selectively discarded if write operations have been disabled and if the write operation is directed to update a designated write operation acceptance area such as metadata associated with the target data set, for example. As a result, the read operation may be permitted to proceed and will not fail because the associated write operation was discarded rather than attempting to commit the write operation to the designated write operation acceptance area, thereby avoiding an error condition for a storage unit such as a volume, in which write operations have been disabled. Accordingly, applications which seek to perform read operations may be permitted to access data stored on such a volume. Other aspects are described.

主权项

1. A method, comprising operations of a storage controller, the storage controller operations comprising:
receiving from a host, a read operation directed to reading target data from a read target area of a storage unit coupled to the storage controller; determining if the write target area of a write operation associated with the read operation is within a designated write operation acceptance area of the storage unit if write operations to the storage unit have been disabled; accepting the associated write operation if the write target area of the write operation is determined to be within the designated write operation acceptance area and discarding the accepted write operation to prevent the write target data from being committed to the write target area; and reading the read target data from the storage unit if write operation is accepted.