Live partition mobility with shared persistent reservations

Patent metadata

Field	Value
Publication number	US-2016306676-A1
Application number	US-201615205407-A
Country	US
Kind code	A1
Filing date	Jul 8, 2016
Priority date	Jun 11, 2014
Publication date	Oct 20, 2016
Grant date	—

Abstract

According to one embodiment of the present invention, a method is provided. The method may include a computer registering a first instance of a logical partition on a source server with a logical unit and placing 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. The method may further include the computer registering a second instance of the logical partition on a destination server with the logical unit and downgrading the first persistent reservation, such that the first and second instances of the logical partition can hold persistent reservations on the logical unit. The method may further include the computer placing, by one or more computer processors, a second persistent reservation on the logical unit.

First claim

What is claimed is:

1 . 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 non-transitory storage media; and program instructions stored on the one or more computer readable non-transitory 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, wherein the logical unit is connected to the source server and the destination server over a storage area network, and wherein the first instance of the logical partition communicates with the logical unit using a first virtual port having a primary world wide port name, and wherein the second instance of the logical partition communicates with the logical unit using a second virtual port having an alternative world wide port name;
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;
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;
program instructions to remove the first persistent reservation from the logical unit, wherein removing the first persistent reservation comprises the second instance of the logical partition preempting the first persistent reservation;
program instructions to remove the first instance of the logical partition from the source server; and
program instructions to upgrade the second persistent reservation, such that only the second instance of the logical partition holds a persistent reservation on the logical unit.

Assignees

• IBM

Inventors

• Anumalasetty Kiran K
• Anumula Venkata N
• Maddali Sudhir
• Rajaboina Yadagiri

Classifications

• G06F9/5077 Primary

  Logical partitioning of resources; Management or configuration of virtualized resources (specific details on emulation or internal functioning of virtual machines G06F9/455) · CPC title

• H04L67/1097

  for distributed storage of data in networks, e.g. transport arrangements for network file system [NFS], storage area networks [SAN] or network attached storage [NAS] · CPC title

• H04L41/082

  the condition being updates or upgrades of network functionality · CPC title

• H04L61/457

  containing identifiers of data entities on a computer, e.g. file names · CPC title

• H04L47/722

  at the destination endpoint, e.g. reservation of terminal resources or buffer space · CPC title