Abstract: Managing physical memory for one or more processes with both a minimum and a maximum amount of physical memory. Memory sets are created, each specifying a number of credits. The total number of credits specified by all memory sets are equal to the total number of pages in physical memory. One or more processes are bound to a memory set. All of the processes bound to a memory set are collectively referred to as the workload of the memory set. Each physical page is accounted for to ensure that each workload can utilize at least the number of physical pages equaling the number of credits in its memory set. Additionally, a workload is permitted to use physical pages that are being explicitly shared by workloads of other memory sets. Accordingly, a workload with both a minimum and a maximum amount of physical memory is specified by its memory set.

Abstract: A system, method and computer program product for virtualizing a processor include a virtualization system running on a computer system and controlling memory paging through hardware support for maintaining real paging structures. A Virtual Machine (VM) is running guest code and has at least one set of guest paging structures that correspond to guest physical pages in guest virtualized linear address space. At least some of the guest paging structures are mapped to the real paging structures. For each guest physical page that is mapped to the real paging structures, paging means for handling a connection structure between the guest physical page and a real physical address of the guest physical page. A cache of connection structures represents cached paths to the real paging structures. Each path is described by guest paging structure descriptors and by tie descriptors. Each path includes a plurality of nodes connected by the tie descriptors.

Abstract: A technique for establishing a dense prefix for a memory in a computer system. Memory is divided into a plurality of chunks. An efficiency factor is generated for each chunk in one or more chunks contained in the plurality of chunks. The efficiency factor may be based on an amount of memory to be reclaimed, an amount of memory to be scanned and an amount of memory to be copied relative to the chunk. A dense prefix is then established for the memory based on an efficiency factor associated with a chunk.

Abstract: Proposed is a storage controller and its control method for speeding up the processing time in response to a command in a simple manner while reducing the load of a controller that received a command targeting a non-associated logical volume. This storage controller includes a plurality of controllers for controlling the input and output of data to and from a corresponding logical unit based on a command retained in a local memory, and the local memory stores association information representing the correspondence of the logical units and the controllers and address information of the local memory in each of the controllers of a self-system and another-system.

Abstract: Apparatus and method for command queue management of back watered requests. A selected request is released from a command queue, and further release of requests from the queue is interrupted when a total number of subsequently completed requests reaches a predetermined threshold.

Abstract: In order to provide a storage system for enabling an administrator to manage information for each apparatus in a straightforward manner, the present invention comprises an acquiring section for acquiring a connection relationship of host apparatus, host management apparatus, storage apparatus, and storage management apparatus, a storage relationship for programs of every host apparatus, and a saving time period for saving data of every program, based on external operation, and a display control section for displaying the connection relationship and storage relationship acquired by the acquiring section on a display screen, and displaying the saved time period of every program on the same screen as the connection relationship and the storage relationship.

Abstract: This document describes tools capable of enabling a protection agent to determine, from memory inaccessible from an operating-system privilege mode, whether one or more resources of an operating system have been modified. In some instances, these tools may enable the protection agent to reside within a virtual machine monitor. In other instances, the tools may enable the protection agent to reside within a distinct virtual partition provided by the virtual machine monitor. By operating outside of the operating-system privilege mode, the protection agent may be less vulnerable to attacks by entities operating within the operating-system privilege mode.

Abstract: Proposed is a storage system and a data management method enabling the easy operation of the storage system and capable of alleviating the burden on a system administrator by managing the full backup and snapshot in the same storage extent.

Abstract: A storage control technique with which, even if not data, but only its management information is deleted, a host system can recognize storage areas storing unnecessary data and so use them effectively. When a file system in the host system deletes the management information for data stored in a page in a pool volume, a control circuit writes ‘0’ in all the areas in the deletion target page in response to a command from the host system. The control circuit then detects the page where ‘0’ is written in all of its areas and releases it from allocation to the corresponding virtual volume.

Abstract: The expansion of a mapping table with additional mapping information involved in the access to virtual volumes is prevented and so a search in the mapping information within a valid time period is ensured, thereby preventing degradation of system performance. A storage apparatus, which defines virtual volumes to which storage areas are dynamically allocated, has a data migration function to migrate data between the virtual volumes and real volumes. With the data migration function, the mapping information for the migrated data is deleted from the mapping table, and accordingly, the size of the mapping table can be limited.

Abstract: A system, method and computer program product for virtualizing a processor include a virtualization system running on a computer system and controlling memory paging through hardware support for maintaining real paging structures. A Virtual Machine (VM) is running guest code and has at least one set of guest paging structures that correspond to guest physical pages in guest virtualized linear address space. At least some of the guest paging structures are mapped to the real paging structures. For each guest physical page that is mapped to the real paging structures, paging means for handling a connection structure between the guest physical page and a real physical address of the guest physical page. A cache of connection structures represents cached paths to the real paging structures. Each path is described by guest paging structure descriptors and by tie descriptors. Each path includes a plurality of nodes connected by the tie descriptors.