Ability to vary on and vary off databases simultaneously across two systems

A system, comprising:

• one or more computer processors;
• and
• a memory containing a program which when executed by the one or more computer processors performs an operation, the operation comprising:
• initiating, at a first node of a pair of nodes in a mirroring environment, a dual vary off operation of a database, a copy of the database being stored on each of the first node of the pair of nodes and a second node of the pair of nodes, the operation to be performed in tandem with the second node;
• and
• at the first node:
• informing the copy of the database stored on the first node of the dual vary off operation;
• informing an operating system of the dual vary off operation;
• waiting for an indication from the second node that it has completed its vary off operation;
• and
• in response to the indication from the second node, completing the dual vary off operation.

A computer-readable storage medium having computer-readable program code embodied therewith, the computer-readable program code executable by one or more computer processors to perform an operation comprising:

• receiving, at a first node of a pair of nodes in a mirroring environment, a dual vary on command indicating to perform a vary on operation on a database in tandem with a second node of the pair of nodes;
• informing a second node of the pair of nodes to initiate dual vary on processing;
• receiving an indication from the second node to continue with the dual vary on processing;
• waiting for an indication from the second node that it is ready to complete the dual vary on operation;
• and
• in response to the indication from the second node, completing the dual vary on operation.