Abstract: A method, system and computer-usable medium are disclosed for managing virtual processor operations. A dynamic loader receives a request to initiate the creation of a new process, followed by a virtual processor being assigned to an isolated execution environment. The dynamic loader then initiates the creation of the new process by mapping kernel data associated with the virtual processor into the address space of the process. The dynamic loader completes the creation of the new process, and its execution is initiated within the isolated execution environment.

Abstract: According to one aspect of the present disclosure a system and technique for verifying data structure consistency across computing environments is disclosed. The system includes: a processor and a compatibility tool. The compatibility tool is executable by the processor to: generate a first signature for a data structure corresponding to a first computing environment; and generate a second signature for the data structure corresponding to a second computing environment. The processor is operable to compare the first and second signatures and, responsive to a disparity between the first and second signatures, indicate a change to the data structure between the first and second computing environments.

Abstract: Provided are techniques for the orderly shutdown of a node within a cluster in the event of asymmetric topology maps, comprising receiving, at a first node, a plurality of heartbeats, each heartbeat corresponding to a particular, corresponding other node in the cluster and comprising information on a topological map corresponding to each particular other node's view of the cluster generating, by the first node, a topological map of the cluster based upon the information comprising the heartbeats; comparing the topological map of the cluster and the topological maps corresponding to each node; in response to a determination that the topological maps of the duster and each node are not in agreement, determining the connectivity of the first node with respect to the cluster and in respond to a determination that the first node has the lowest connectivity within the cluster, shutting down the first node.

Abstract: According to one aspect of the present disclosure, a method and technique for verifying data structure consistency across computing environments is disclosed. The method includes: generating a first signature for a data structure corresponding to a first computing environment; generating a second signature for the data structure corresponding to a second computing environment; comparing the first and second signatures; and responsive to a disparity between the first and second signatures, indicating a change to the data structure between the first and second computing environments.

Abstract: According to one aspect of the present disclosure, a method and technique for communications over multiple protocol interfaces in a computing environment is disclosed. The method includes: identifying a network interface for egress data packet communications; responsive to the identified network interface differing from a data packet fragmentation technique desired for the data packet communications, deriving fragmentation data according to the desired data packet fragmentation technique; generating an application layer header for the data packet communications; storing values of the fragmentation data in select fields of the application layer header; fragmenting the data packet communications according to the desired data packet fragmentation protocol; and transmitting the data packet communications including the application layer header over the identified network interface.

Abstract: According to one aspect of the present disclosure a system and technique for communications over multiple protocol interfaces in a computing environment is disclosed. The system includes a processor and logic executable by the processor to: identify a network interface for egress data packet communications; responsive to the identified network interface differing from a data packet fragmentation technique desired for the data packet communications, derive fragmentation data according to the desired data packet fragmentation technique; generate an application layer header for the data packet communications; store values of the fragmentation data in select fields of the application layer header; fragment the data packet communications according to the desired data packet fragmentation protocol; and transmit the data packet communications including the application layer header over the identified network interface.

Abstract: A mechanism is provided for isolation of device namespace to allow duplicate or common names in root volume group workload partitions. The mechanism creates a scratch file system that contains enough information to create an execution environment for a workload partition and information about which physical volumes to use for the root volume group file systems. The mechanism then populates the root file systems on a disk in the global space. The mechanism boots the workload partition from the scratch file system and configures the devices to be exported to the workload partition based information in the scratch file system. The mechanism then renames the logical volume names to the traditional names. The mechanism then temporarily mounts the root volume group file system onto the scratch file system.

Abstract: When moving workload partitions (WPARs) from machine to machine, operating systems may encounter errors that prevent successful WPAR migration. Recording and reporting errors can be challenging. To move WPARs, the operating system may employ a plurality of software components, such as code residing in user space (e.g., application programs, OS libraries, and shell scripts), code residing in the operating system's kernel, and code residing on remote machines. Embodiments of the invention include a framework that enables all the software components to record errors. The framework can also report the errors to users and processes.

Abstract: A method includes receiving a command for migration of a workload partition having multiple processes from a source machine to a target machine. The method includes executing, for each of the multiple processes at least partially in parallel, an operation to create checkpoint data. The operation to create the checkpoint data provides an estimation of a size of the checkpoint data that is needed for migration, wherein the operation to create the checkpoint data is independent of storing the checkpoint data in the file. The method includes allocating areas within the file for storage of the checkpoint data for each of the multiple processes. The method includes storing the checkpoint data, for each of the multiple processes at least partially in parallel, into the areas allocated within the file based on offsets in the file for each of the multiple processes.

Abstract: A versioned workload partition (WPAR) can be migrated from a source machine to a destination machine. Each thread associated with a process executing within the versioned WPAR is frozen. For each thread associated with the process, an error number associated with the thread is received in response to freezing execution of the thread and at least a current state of the thread is determined as checkpoint information associated with the thread based, at least in part, on the error number associated with the thread. The checkpoint information associated with the one or more threads is provided to the destination machine. The checkpoint information is used at the destination machine to reconstruct the process within a destination versioned WPAR on the destination machine.

Abstract: Disclosed is a computer implemented method to resume a process at an arrival machine that is in an identical state to a frozen process on a departure machine. The arrival machine receives checkpoint data for the process from the departure machine. It creates the process. It updates a page table, wherein the page table comprises a segment, page number, and offset corresponding to a page of the process available from a remote paging device, wherein the remote paging device is remote from the arrival machine. It resumes the process and responsively generates a page fault for the page. It looks up the page in the page table, responsive to the page fault. It determines whether the page is absent in the arrival machine. It transmits a page-in request to the departure machine, responsive to a determination that the page is absent. It receives the page from the departure machine.

Abstract: According to one aspect of the present disclosure, a method and technique for product license management for a clustered environment having a plurality of nodes is disclosed. The method includes unlocking a product on a first node of the plurality of clustered nodes; responsive to unlocking the product on the first node, indicating an unlocked status of the product on a shared storage device accessible to the plurality of clustered nodes; and transmitting a self-unlock message from the first node to remaining nodes of the cluster to enable the remaining nodes of the cluster to self-unlock the product on the respective remaining nodes based on the status indication of the shared storage device.

Abstract: A method, system, and computer usable program product for isolating a workload partition space are provided in the illustrative embodiments. A boot process of a workload partition in a data processing system is started using a scratch file system, the scratch file system being in a global space. A portion of a storage device containing a file system for the workload partition is exported to the workload partition, the portion forming an exported disk. The partially booted up workload partition may discover the exported disk. The exporting causes an association between the global space and the exported disk to either not form, or sever. The exporting places the exported disk in a workload partition space associated with the workload partition. The boot process is transitioned to stop using the scratch file system and start using the data in the exported disk for continuing the boot process.

Abstract: Disclosed is a computer implemented method and computer program product to prioritize paging-in pages in a remote paging device. An arrival machine receives checkpoint data from a departure machine. The arrival machine restarts at least one process corresponding to the checkpoint data. The arrival machine determines whether a page associated with the process is pinned. The arrival machine associates the page to the remote paging device, responsive to a determination that the page is pinned. The arrival machine touches the page.

Abstract: Disclosed is a computer implemented method and computer program product to resume a process at an arrival machine that is in an identical state to a frozen process on a departure machine. The arrival machine receives checkpoint data for the process from the departure machine. The arrival machine creates the process. The arrival machine updates a page table, wherein the page table comprises a segment, page number, and offset corresponding to a page of the process available from a remote paging device, wherein the remote paging device is remote from the arrival machine. The arrival machine resumes the process. The arrival machine generates a page fault for the page, responsive to resuming the process. The arrival machine looks up the page in the page table, responsive to the page fault. The arrival machine determines whether the page is absent in the arrival machine. The arrival machine transmits a page-in request to the departure machine, responsive to a determination that the page is absent.

Abstract: In one embodiment a method for migrating a workload from one processing resource to a second processing resource of a computing platform is disclosed. The method can include a command to migrate a workload that is processing and the process can be interrupted and some memory processes can be frozen in response to the migration command. An index table can be created that identifies memory locations that determined where the process was when it is interrupted. Table data, pinned page data, and non-private process data can be sent to the second processing resource. Contained in this data can be restart type data. The second resource or target resource can utilize this data to restart the process without the requirement of bulk data transfers providing an efficient migration process. Other embodiments are also disclosed.

Abstract: When moving workload partitions (WPARs) from machine to machine, operating systems may encounter errors that prevent successful WPAR migration. Recording and reporting errors can be challenging. To move WPARs, the operating system may employ a plurality of software components, such as code residing in user space (e.g., application programs, OS libraries, and shell scripts), code residing in the operating system's kernel, and code residing on remote machines. Embodiments of the invention include a framework that enables all the software components to record errors. The framework can also report the errors to users and processes.

Abstract: A versioned workload partition (WPAR) can be migrated from a source machine to a destination machine. Each thread associated with a process executing within the versioned WPAR is frozen. For each thread associated with the process, an error number associated with the thread is received in response to freezing execution of the thread and at least a current state of the thread is determined as checkpoint information associated with the thread based, at least in part, on the error number associated with the thread. The checkpoint information associated with the one or more threads is provided to the destination machine. The checkpoint information is used at the destination machine to reconstruct the process within a destination versioned WPAR on the destination machine.

Abstract: A mechanism is provided for isolation of device namespace to allow duplicate or common names in root volume group workload partitions. The mechanism creates a scratch file system that contains enough information to create an execution environment for a workload partition and information about which physical volumes to use for the root volume group file systems. The mechanism then populates the root file systems on a disk in the global space. The mechanism boots the workload partition from the scratch file system and configures the devices to be exported to the workload partition based information in the scratch file system. The mechanism then renames the logical volume names to the traditional names. The mechanism then temporarily mounts the root volume group file system onto the scratch file system.

Abstract: A method includes receiving a command for migration of a workload partition having multiple processes from a source machine to a target machine. The method includes executing, for each of the multiple processes at least partially in parallel, an operation to create checkpoint data. The operation to create the checkpoint data provides an estimation of a size of the checkpoint data that is needed for migration, wherein the operation to create the checkpoint data is independent of storing the checkpoint data in the file. The method includes allocating areas within the file for storage of the checkpoint data for each of the multiple processes. The method includes storing the checkpoint data, for each of the multiple processes at least partially in parallel, into the areas allocated within the file based on offsets in the file for each of the multiple processes.