Storage unit replacement using point-in-time snap copy

摘要

In one embodiment, I/O operations may be swapped from an original storage unit to a replacement storage unit in a manner which can reduce or eliminate delays caused by copying of data from the original storage unit to the replacement storage unit. A point-in-time snap copy relationship between the original storage unit and the replacement storage unit of storage locations is established and I/O operations are swapped from the original storage unit to the replacement storage unit. The I/O operations are resumed, accessing the replacement storage unit instead of the original storage unit in the input/output operations issued by the at least one host. Other aspects are described.

主权项

1. A method, comprising:
accessing storage locations of an original storage unit in response to received input/output operations, wherein the accessing includes at least one of writing updates to and reading data from the storage location being accessed; quiescing input/output operations to the original source storage unit; after quiescing input/output operations to the original source storage unit, creating a point-in-time snap copy of the original storage unit as a replacement storage unit of storage locations and swapping the replacement storage unit for the original source storage unit; and initiating accessing storage locations of the replacement storage unit instead of storage locations of the original storage unit, in response to received input/output operations, wherein the accessing includes unquiescing input/output operations and at least one of writing updates to and reading data from the storage location of the replacement storage unit being accessed.