Live partition mobility with shared persistent reservations

A computer program product for transferring a logical partition from a source server to a destination server, the computer program product comprising:

• one or more computer readable storage media and program instructions stored on the one or more computer readable storage media, the program instructions comprising:
• program instructions to register a first instance of a logical partition on a source server with a logical unit;
• program instructions to place a first persistent reservation on the logical unit, wherein the first persistent reservation indicates that only the first instance of the logical partition can hold a reservation on the logical unit;
• program instructions to register a second instance of the logical partition on a destination server with the logical unit;
• program instructions to downgrade the first persistent reservation, such that the first and second instances of the logical partition can hold persistent reservations on the logical unit at the same time;
• and
• program instructions to place a second persistent reservation on the logical unit, wherein the second instance of the logical partition holds the second persistent reservation on the logical unit at the same time as the first instance of the logical partition holds the first persistent reservation on the logical unit.

A computer system for transferring a logical partition from a source server to a destination server, the computer system comprising:

• one or more computer processors;
• one or more computer readable storage media;
• program instructions stored on the computer readable storage media for execution by at least one of the one or more processors, the program instructions comprising:
• program instructions to register a first instance of a logical partition on a source server with a logical unit;
• program instructions to place a first persistent reservation on the logical unit, wherein the first persistent reservation indicates that only the first instance of the logical partition can hold a reservation on the logical unit;
• program instructions to register a second instance of the logical partition on a destination server with the logical unit;
• program instructions to downgrade the first persistent reservation, such that the first and second instances of the logical partition can hold persistent reservations on the logical unit at the same time;
• and
• program instructions to place a second persistent reservation on the logical unit, wherein the second instance of the logical partition holds the second persistent reservation on the logical unit at the same time as the first instance of the logical partition holds the first persistent reservation on the logical unit.