Abstract: An I/O request to store a file in a file-system is received. A determination is made whether the size of the file does not exceed a threshold size. Exceeding the threshold results in storing at least a portion of the file in a block of the file-system devoid of sub-blocks. A determination is made whether the size of the file does not exceed a size of unallocated space within a single block in the file-system. The single block includes a set of sub-blocks. Responsive to the size of the file not exceeding the threshold size and the size of unallocated space within the single block, the file is stored, at an address, in a first subset of the set of the sub-blocks of the single block. The address identifies the single block and a position of a sub-block in the subset.

Abstract: A method, system and computer-usable medium are disclosed for dynamic load based resource sets that provide flexible assignment of resources to processes with nested resource sets. Resource sets include plural resource subsets so that processes that are assigned to a resource subset can have additional resources flexibly made available by providing additional resources from a parent resource set. A resource threshold is monitored to selectively adjust process resource subset assignments based upon utilization of resources within a resource subset, such as by comparing the number of threads assigned to a resource subset with the number processors available to run the threads.

Abstract: In a method for regulating network bandwidth in a virtualized computer environment, a computer having a hypervisor program receives a request from a first virtual client to transmit data. In response, the computer transfers the data from a memory of the first virtual client to a memory of a virtual server. The computer receives an error notification from a shared virtual network adapter of the virtual server, indicative of insufficient network bandwidth available to transmit the data. In response, the computer notifies the first virtual client that insufficient network bandwidth is available to transmit the data.

Abstract: Mechanisms are provided for performing traffic load balancing on ingress traffic directed to a Link Aggregation Group (LAG). The mechanisms monitor a ingress traffic load across a plurality of links of the Link Aggregation Group (LAG). The mechanisms determine if the ingress traffic load across the plurality of links is unbalanced. Moreover, the mechanisms, in response to determining that the ingress traffic load across the plurality of links is unbalanced, send a message to a switch associated with the LAG requesting the switch to modify routing of ingress traffic to the LAG to perform ingress traffic load balancing.

Abstract: Mechanisms are provided for performing traffic load balancing on ingress traffic directed to a Link Aggregation Group (LAG). The mechanisms monitor a ingress traffic load across a plurality of links of the Link Aggregation Group (LAG). The mechanisms determine if the ingress traffic load across the plurality of links is unbalanced. Moreover, the mechanisms, in response to determining that the ingress traffic load across the plurality of links is unbalanced, send a message to a switch associated with the LAG requesting the switch to modify routing of ingress traffic to the LAG to perform ingress traffic load balancing.

Abstract: A service module that provides for discovery of one or more network interfaces connecting a prospective remote procedure call (RPC) client, facilitates the provision of RPC programs in a network including multi-horned systems. When a request for a network address to an RPC application providing an RPC program is received from the RPC client, the RPC bind daemon discovers from the module, using the client response address, over which interface(s) the client is accessible. The daemon then selects an address of a network path to the RPC application that the prospective client can access and returns the corresponding network address. The service module monitors the network stack for RPC get address requests and builds tables of client address entries with corresponding network interface identifiers. The entries are retired according to an aging policy.

Abstract: Virtual machines within a network computing environment negotiate among themselves with regard to the sharing of resources via respective resource managers. The resource agent monitors resource allocation patterns of its virtual machine and responsively updates usage data in a resource availability map and compares the updated usage data to a minimum operational requirements threshold and a surplus amount threshold. If the updated usage fails to meet the minimum operational requirements threshold, the resource agent determines a needed shortfall amount of resources, searches the resource availability map for offers of the shortfall from resource agents, and sends out a request to a resource agent offering the shortfall amount. If the updated usage data meets the minimum operational requirements threshold, the resource agent determines a surplus amount of a resource that exceeds the surplus amount threshold and creates and broadcasts an offer of the surplus amount to the other resource agents.

Abstract: A method, system, and computer program product for improving memory utilization of sparse pages are provided in the illustrative embodiments. A set of virtual pages is identified. Each virtual page in the set of virtual pages is a sparse virtual page. The set of virtual pages includes a first sparse virtual page and a second sparse virtual page. At least a portion of data of the first sparse virtual page in the set of virtual pages is stored in a first physical page. The first physical page belongs to a set of consolidation physical pages, and the first physical page also stores at least a portion of the data of the second sparse virtual page. The first and the second sparse pages are mapped to the first physical page.

Abstract: Page faults during partition migration from a source computing system to a destination computing system are reduced by assigning each page used by a process as being hot or cold according to their frequency of use by the process. During a live partition migration, the cold or coldest (least frequently used) pages are copied to the destination server first, followed copying the warmer (less frequently used) and concluded by copying the hottest (most frequently used) pages. After all dirtied pages have been refreshed, cutover from the instance on the source server to the destination server is made. By transferring the warm and hot pages last (or later) in the migration process, the number of dirtied pages is reduced, thereby reducing page faults subsequent to the cutover.

Abstract: A system and method and computer program product for user authentication that uses information about a user's context or context of their personal device(s) to dynamically modify that user's authentication or login requirements to an application in a computer or mobile device. The system is configured to run methods that detect and make use of a user's context that includes: a current environment or personal context, and uses this capability to enable variable strength authentication when attempting to log in or enter another application or resource. In one embodiment, the system implements methods to dynamically adjust the authentication challenge as a differential of all accumulated user contexts (e.g., providing a shorter password or pin-code).

Abstract: A computer implemented method for obtaining a secure route. A trusted host sets a node security association for a trusted host. The trusted host receives, at the trusted host, a client communication request directed to a destination host. The trusted host builds a secure route query comprising a trusted host address, a destination host address, and at least one security level, to form at least one secure route. The trusted host sends packets from the trusted host to the destination host based on the at least one secure route. The packets are responsive to the client communication request, and the packets each have a security label that matches the security level.

Abstract: A computer implemented method and computer program product for obtaining a secure route. A trusted host sets a node security association for a trusted host. The trusted host receives, at the trusted host, a client communication request directed to a destination host. The trusted host builds a secure route query comprising a trusted host address, a destination host address, and at least one security level, to form at least one secure route. The trusted host sends packets from the trusted host to the destination host based on the at least one secure route. The packets are responsive to the client communication request, and the packets each have a security label that matches the security level.

Abstract: Integrated computing systems with independently managed infrastructures including compute nodes and storage nodes form a cluster. Storage resource agents manage storage resources in the cluster. The resource agents identify storage requirements associated with allocation sets for resource consumers dispatched in the cluster, communicate with each other to locate inter-system storage resources that primarily satisfy locality criteria associated with resource consumer workloads, secondarily satisfy allocation set activity criteria associated with the allocation sets, and allocate the storage resources to the resource consumers to satisfy the storage requirements. The storage resource agents may base storage assignments on data placement information from a priority map. Data may be later relocated to alternate storage resources in satisfaction of cluster-wide storage policies, priority determinations, and data access rate determinations.

Abstract: File system errors are handled and computing systems are recovered by, responsive to receiving a page buffer request, initializing a sleep timer according to a detection interval value plus a hang resolution range value; responsive to the timer expiring, detecting that a process, thread, application program, daemon, or task is waiting on availability of the requested page buffer; and responsive to the detection, quarantining metadata associated with the requested page buffer, failing the page buffer request and releasing one or more locks on the requested page buffer. This process is then optionally repeated for additional processes, threads, application programs, daemons, tasks or combinations thereof which are waiting for availability of the requested page buffer, optionally randomizing the detection interval value in order to avoid an instantaneous recovery from the error.

Abstract: A computer implemented method, system and apparatus for rebooting a host having a plurality of network interfaces. A server reboots the host by stopping an NFS server process on the host. The server sends at least one consolidated notification to a plurality of clients identified in a consolidated notification table, wherein the consolidated notification comprises at least two addresses of network interfaces of the host. The server determines that an acknowledgement is received from each of the plurality of clients. The server halts resending of consolidated notifications, responsive to determining that an acknowledgement is received from the each of the plurality of clients.

Abstract: In a method for allocating space on a logical disk, a computer receives an allocation request to allocate a number of requested logical disk extents. The computer selects one of a first group having an array of logical disk extents and a second group having an array of logical disk extents. The computer selects a group having a number of free logical disk extents that is greater than or equal to the number of requested logical disk extents. The logical disk extents in the array of the first group and in the array of the second group correspond to disk blocks on a logical disk. The logical disk spans one or more physical random access disks. The computer locks the selected group to prevent allocating a logical disk extent other than in response to the allocation request.

Abstract: A computer identifies a relationship among a subset of a set of data blocks, a basis of the relationship forming a context shared by the subset of data blocks. The computer selects a code data structure from a set of code data structures using the context. The context is associated with the code data structure, and the code data structure includes a set of codes. The computer computes, for a first data block in the subset of data blocks, a first code corresponding to a content of the first data block. The computer determines whether the first code matches a stored code in the code data structure. The computer replaces, responsive to the first code matching the stored code, the first data block with a reference to an instance of the first data block. The computer causes the reference to be stored in a target data processing system.

Abstract: In a method for allocating space on a logical disk, a computer receives an allocation request to allocate a number of requested logical disk extents. The computer selects one of a first group having an array of logical disk extents and a second group having an array of logical disk extents. The computer selects a group having a number of free logical disk extents that is greater than or equal to the number of requested logical disk extents. The logical disk extents in the array of the first group and in the array of the second group correspond to disk blocks on a logical disk. The logical disk spans one or more physical random access disks. The computer locks the selected group to prevent allocating a logical disk extent other than in response to the allocation request.

Abstract: Provided are techniques for more efficient data storage on a computing system. An inode table is provided and populated with information relating to current and N previous locations within data storage that a particular data block has been stored. When a particular data block is modified in a redirect on write system, the modified data block is stored, if possible in a previous storage location for that particular data block and the current data location may be saved for use as the location for a subsequent modification.

Abstract: Illustrative embodiments include a method, system, and computer program product for estimating boot-time memory requirement of a data processing system. A data processing system identifies, using system configuration information associated with the data processing system, a set of components needed for booting up the data processing system. The data processing system determines a dependency of a component identified in the set of components, the component including a memory estimator program. The data processing system determines an ancestry of the component identified in the set of components. The data processing system receives, using the memory estimator program of the component, a boot-time memory requirement of the component. The data processing system calculates a total boot-time memory requirement. The data processing system determines whether an amount of real memory of the data processing system satisfies the total boot-time memory requirement.