77 results about "Failure domain" patented technology

A hybrid quorum / consensus and primary-backup fault-tolerance model in an object-based distributed data storage system. When a primary manager fails, a hierarchy of network entities is established in which a group of realm managers first authorizes a failure-handling event through quorum / consensus and a backup manager (for the failing primary manager) then executes the decision of the quorum of realm managers. The realm managers, operating by consensus, determine whether (a) the primary manager can indeed be asserted to be down, and (b) whether there is a quorum of realm managers in agreement on this decision. If both are true, a master realm manager instructs the backup manager to proceed to execute the necessary steps to become the primary manager and function as the primary until the original primary manager is brought back into service. The hybrid fault-tolerance approach handles both single unit failures and network partitions in a unified way, without creating a single cluster out of the fault domain.

A single page enterprise wide level display provides a comprehensive readily understood representation of the overall health status of a complex plant. Color coded failure domains allow rapid intuitive recognition of component failure status. A three-tier hierarchy of displays provide details on the health status of the components and systems displayed on the enterprise wide level display in a manner that supports a logical drill down to the health status of sub-components on Tier 1 to expected faults of the sub-components on Tier 2 to specific information relative to expected sub-component failures on Tier 3.

A method, computer program product, and computing system for identifying at least one misassigned slice that is associated with a first data tier and is located in a first front end LUN. The at least one misassigned slice is being accessed contrary to the first data tier. The failure domain of the first front end LUN is determined. At least one replacement slice that is associated with a second data tier and is located in a second front end LUN is identified based, at least in part, upon the failure domain of the first front end LUN. The at least one misassigned slice is moved to the second front end LUN. The at least one replacement slice is moved to the first front end LUN.

A method, computer program product, and computing system for comparing at least one performance benchmark to at least one performance indicator for a front end LUN. If the at least one performance indicator exceeds the at least one performance benchmark, the failure domain of the front end LUN is reduced. If the at least one performance indicator does not exceed the performance benchmark, the failure domain of the front end LUN is increased.

A method and system usable in sensor networks for handling memory faults is disclosed. In order to protect the operating system of a sensor node, coarse-grained memory protection is provided by creating and enforcing an application fault domain in the data memory address space of the sensor node. The data memory accessed by the application modules is restricted to the region (which defines the application fault domain) within the data memory address space. The application modules are prevented from accessing memory outside the application fault domain through software-based run-time checks. The state belonging to the operations system is maintained outside of the application fault domain, and is thus protected from memory corruption from any application module. In order to ensure that an application module does not operate on a corrupted state, fine-grained error detection and recovery is provided within the application fault domain. Any corruption of memory within the application fault domain is detected by a run-time memory integrity verifier implemented in the operating system kernel. Recovery involves purging the corrupted state and restarting only the affected application module to operate on an uncorrupted state.

The invention discloses a method for diagnosing failures of an analog circuit based on heterogeneous information fusion. The method comprises the following steps: measuring a temperature variation value of a circuit element to be diagnosed; calculating an optimum gate valve value of the variation value of working temperature of each element; integrating the temperature variation value of an element more than the optimum gate valve value into a failure domain phi, and calculating by a temperature membership grade model to acquire a temperature evidence value of each element; applying an actuating signal to a circuit to be diagnosed to measure voltage of a measurable point; inputting information of the voltage of the measurable point into a BP neural network to carry out primary diagnosis so as to acquire an evidence value of voltage of the measurable point; and fusing the evidence value of temperature and the evidence value of voltage by a heterogeneous information fusion system, acquiring an associated weight coefficient, identifying the weight coefficient and unifying the weight coefficient, and regulating and carrying out D-S fusion on the two types of the evidence values to determine a failure element. The method solves the problem of inaccurate judgment caused by deficiency of feature information and incompatible heterogeneous information in failure diagnosis of the analog circuit, and improves the accuracy of the failure diagnosis.

The embodiment of the present invention provides a method of data migration, a controller and a data migration apparatus. The method comprises that: the controller counts access frequency of a data block in a first level failure domain, the data block comprising ith target data, wherein i is an integer larger than or equal to zero, and i<N; when the access frequency of the data block reaches up to a preset threshold value, the controller determines a second level failure domain to store the data block in a second level disk set, the determined second level failure domain being free of saving the target data; and the controller migrates the data block to the second level failure domain. Multiple target data are prevented from being migrated to the same failure domain during hierarchical storage operation, and data reliability is ensured.

Various systems and methods for determining whether a distributed storage cluster is operating with a last failure domain are disclosed. The last failure domain is the only node with access to a latest copy of configuration data and an up-to-date copy of application data. In response to a determination that the distributed storage cluster is operating with the last failure domain, the method causes the last failure domain to copy one or more changed blocks of the up-to-date copy of the application data from one or more mirrored volumes to a recovery server for storage.

The invention discloses an existing structure static equivalent reliability evaluation method based on an interval set envelope function. The method comprises the steps that the envelope function is introduced into the reliability problem of a dynamic structure, a failure domain of the multi-parameter structure uncertainty changing along with time is approximately constructed through an envelope surface, a dynamic problem is transformed into a static problem, and effective evaluation on the structural security situation is achieved through reliability degree index calculation. According to the method, a partial differential equation is defined according to the character that the envelope surface in the internal set envelope function is tangent to a failure boundary hypersurface continuously changing along with time, and a risk moment corresponding to an extension point is solved; a limited dimensional static failure domain equivalent to an original dynamic problem at a limited risk moment is obtained by building a multi-dimensional hypercube model containing the correlation; the static equivalent reliability degree calculation process of an existing structure is finally achieved on the basis of a volume ratio idea, and the traditional time-varying reliability calculation scale is greatly reduced while the precision is guaranteed.

The invention relates to network safety equipment and a domain name system (DNS) message processing method, which are applied to a computer network. The network safety equipment is positioned between a DNS client and a DNS server and comprises a primary judgment unit, a secondary judgment unit and a forwarding unit, wherein the primary judgment unit is used for receiving a DNS response message and checking whether a resolved internet protocol (IP) address is carried in the response message, if so, submitting the message to the secondary judgment unit, otherwise determining that domain name resolution fails and updating failure domain name resolution record; the secondary judgment unit is used for checking whether the resolved IP address carried in the DNS response message corresponds to the domain name requested to be resolved by a DNS, if so, determining that the domain name resolution is success, otherwise determining that the domain name resolution fails and updating the failure domain name resolution record; and the forwarding unit is used for forwarding the DNS response message to the DNS client.

Techniques are disclosed relating to provisioning fault domain sets (FDS). In some embodiments, a computer server system implements an FDS for disseminating a storage service across a plurality of fault domains. To implement the FDS, in some embodiments, the computer server system access FDS data specifying a desired state of the FDS in which the storage service is disseminated across at least a particular number of fault domains. The computer server system may determine available resources of the plurality of fault domains and determine a current state of the FDS based on fault domains that have already been provisioned to the FDS. Based on at least the desired state of the FDS, the current state of the FDS, and the available resources, the computer server system provisions one or more additional fault domains to the FDS to reconcile the FDS's current state with the FDS's desired state.

The embodiment of the invention provides a distributed storage system fault recovery method and device, a terminal and a storage medium. The method comprises the steps: searching for a placement groupwhere a lost object is located; deleting the placement group; deleting osd process data corresponding to the placement group and marking the osd process as completed; and checking a cluster state, and checking a cluster fault recovery result according to the cluster state. According to the method, for the cluster exceeding the fault domain, the cluster can continuously provide services to the outside under the condition of not destroying the existing cluster, and cyclic coverage writing and playback scenes needing videos under certain conditions are guaranteed.

The embodiment of the invention discloses a hard disk failure domain detection method and device and a computer readable storage medium. According to failure domain names corresponding to obtained target nodes, all OSD service numbers contained in the target nodes are obtained, and the obtained OSD service numbers are OSD service numbers theoretically contained in the failure domain. A numbered list stored in the system records the OSD service numbers actually mounted on the target node, and the OSD service numbers are actual numbers. Whether or not all the OSD service numbers contained in thetarget nodes are matched with the actual numbers contained in the numbered list is judged in sequence; if the OSD service number which are not matched with the actual numbers exist, alarm prompting is conducted. Accordingly, an alarm mechanism of Ceph is perfected, detection on failure domains belonging to a hard disk is achieved, alarm is given actively after problems are found, a redundancy mechanism of the Ceph is further protected, and the phenomenon that due to artificial modification or misoperation, cluster nodes are damaged, and then data is lost is avoided.

The invention belongs to the field of system safety technical researches and particularly relates to a safety probability risk assessment method using a set theory for a multi-failure-mode correlation system. According to the method, firstly, for a multi-failure-mode correlation characteristic of a complex system, failure modes of the system are presented by failure domains corresponding to a plurality of time-varying limit state functions by using the set theory, and the problem of system safety modeling in a multi-failure mode is solved; for a degradation characteristic of the failure mode correlation system, the time factor is considered, and the time-varying condition of a system safety model in the multi-failure mode is obtained; and on the basis of obtaining of accumulated failure domains corresponding to the multi-failure mode, the safety risk probability analysis assessment is performed with a Monte Carlo method, and the problem of system safety quantitative assessment correlated with the multi-failure mode and with a time-varying characteristic is solved.

The invention discloses a storage pool creation method. The method comprises the following steps: acquiring a plurality of nodes under default root; judging whether to perform data isolation or not; in response to data isolation, obtaining the type of a fault domain; in response to the fact that the fault domain is rack, creating the rack and adding a plurality of nodes in the plurality of nodes into the created rack; constructing a crush structure of a root / trace / host level; and binding a preset protection strategy with the cuss structure, and creating a storage pool by utilizing the cuss structure bound with the protection strategy. The invention further discloses a system, computer equipment and a readable storage medium. According to the scheme provided by the invention, isolation is carried out based on the storage pool when the storage pool is created, so that no intersection exists between a disk OSD and an old storage node, the independence of part of storage data is ensured, and the safety and the read-write performance of a client on the storage data are correspondingly improved.

The invention discloses a Crush creation method and system for deploying Ceph based on Rook, and belongs to the technical field of cloud computing. The method comprises the following specific steps: S1, detecting a Ceph version, and deploying a Ceph cluster component service; S2, deploying and adding OSD nodes; S3, setting task execution by utilizing CrushRoot; S4, executing a Crush Rules task, and carrying out the creation according to the Crush Root fault domain level of the Ceph cluster; S5, executing the CepBlock Pool user-defined resource, and creating Pool according to the selected CephCrush Rule and the number of pg. According to the method and the device, the Crush Root and the Crush Rules are automatically created after the Ceph cluster is deployed by the Rook; the defect that the Crush Root and the Crush Rules cannot be automatically created after the Ceph cluster is quickly deployed by the Rook is overcome; the requirement that the Ceph cluster performs resource division ondifferent storage type nodes in an actual use scene is met; the deployment efficiency is improved through automatic creation, the efficiency of implementation personnel is improved, and the risk thaterrors are prone to occurring due to manual intervention is avoided.

The invention discloses a power distribution network complex fault positioning method based on D-PMU limited node information. The method comprises the steps: achieving optimal configuration of leastoptimal D-PMU nodes under a condition that a power grid constraint condition and a target function are met; on the basis of D-PMU optimal configuration, carrying out monitoring range set division on atopological structure of a whole power distribution network, wherein a divided monitoring range set should reduce the number of D-PMUs as much as possible while faults are ensured to be accurately positioned; on the basis of monitoring range set division, determining a suspicious range set by abruptly changing a phase current in a monitoring range set to 0 or enabling a differential current to exceed a threshold value; and proposing an unbalanced current fault positioning algorithm, calculating an unbalanced current value of each node in the suspicious range set, and comparing the unbalancedcurrent values of the nodes in a suspicious fault domain so as to determine a complex fault position.

The invention discloses a method for achieving SAN network data equalized transmission. The method comprises following steps that an A / P type storage Lun is mapped to an array controller A and an array controller B by an A / P array; that the array controller A is connected with a first host HBA card through a first switch; that the array controller B is connected with a second host HBA card through a second switch; that the first switch is connected with the second switch; that a host packages a transmission link with multipath software; that a SAN network performs data equalized transmission with the second switch by using the first switch. The method may sharply decrease faults in each link, reduce single point failure domain, achieve link multiplexing in order that a link originally in a Standby mode is switched to an active mode, bear service data transmission, and increase data throughout. The invention also discloses a system for implementing the method.

The invention discloses a method and equipment for data protection, which are used for solving the problems that the performance of a distributed storage cluster is reduced and the service operation is influenced after a fault occurs in a fault domain in the prior art. In the embodiment of the invention, the distributed storage cluster redivides the hard disks in the fault domains without faults to obtain at least one new fault domain, reselects the hard disks with distributed data fragments in the new fault domain according to the initial data fragment distribution rule, and performs recoveryand re-equalization in the reselected hard disks. According to the embodiment of the invention, after a fault occurs in a fault domain; the distributed storage cluster redivides the hard disks in thefault domains without faults in time to obtain new fault domains, and then recovers the lost data based on the redivided fault domains, so that the probability that the performance is reduced and theservice cannot run normally due to the fact that the fault domains fail and cannot be processed in time is reduced.

The present invention introduces a specific form of parity protection chunk (PPC) that allows for distributed creation of coordinated PPCs that can reliably provide protection against the concurrent loss of two or more storage servers of devices. Coordinated PPCs can protect against the concurrent loss of multiple lost chunks by ensuring that the PPCSs protecting any specific chunk have at most a single overlapping failure domain. This is done without requiring full centralized control over the assignment of protected chunks to specific PPCs. The PPCs are created as part of the put transaction for a chunk. The chunk itself is stored as a whole replica, and the PPCs provide parity protection for the chunk.

The invention discloses a reliability simulation method related to failure of multiple components of a typical mechanism of an aero-engine. The method comprises the following steps: firstly, determining an initial state of a Markov chain based on an active learning kriging model, and then identifying all most probable failure domains in a multi-failure performance function according to Markov chain Monte Carlo simulation; then constructing an adaptive kernel density estimation important sampling function through samples in the failure domain, taking important samples in the adaptive reduced sample pool as candidate samples, and adding new sample points through a learning function to update the proxy model until the proxy model approaches a real performance function; and finally, calculating a failure probability by utilizing the finally updated proxy model. The Markov chain initial state determination method and the adaptive sample pool reduction strategy provided by the invention are combined with the active learning Kriging proxy model, so that the modeling precision is improved, the number of candidate samples is reduced, and the calculation precision and the calculation efficiency are relatively high.

The invention discloses a disk selection method and device for a distributed storage cluster and a computer readable storage medium. The method comprises the steps that a conflict domain used for storing selected object storage equipment and related information of a fault domain where the selected object storage equipment is located is constructed. In the process of sequentially selecting the OSDs downwards from the root node according to the root node information, the fault domain type and the total number of the OSDs to be selected, if the current member is in the conflict domain, selecting other members from the layer where the current member is located; if the current member is not in the conflict domain, the type of the current member is matched with the type of the fault domain, and the object storage device contained in the current member is not selected, member selection is carried out from the next layer of the layer where the current member is located until a target member of the OSD type is selected; and the target member information and the current member information are input into the conflict domain to update the conflict domain, thereby effectively reducing the frequency of invalid disk selection by a data distribution algorithm, improving the disk selection efficiency, and reducing the occupation of CPU resources and the consumption of time.

The invention discloses a member list determination method, apparatus and device, and a readable storage medium. The method comprises the steps of selecting new action members from a current action list of a collating group; selecting alternative action members from the allinfo members of the collating group, and selecting alternative action members from the allinfo members of the collating group; judging whether the new action member has a fault domain conflict or not; if yes, replacing the new action member corresponding to the fault domain conflict with an alternative action member conforming to the fault domain in the alternative action members, and constructing a new action list by using the replaced new action member; If not, constructing a new action list by using the new action member. According to the method and the device, the fault domain conflict problem of the new action members participating in construction of the new action list can be avoided, cluster errors caused by the existence of the fault domain conflict can be avoided when subsequent faults occur, and continuous external service service providing can be effectively guaranteed.

The invention relates to a solid state disk wear balancing method for a distributed storage system, which comprises the following steps of: step 1, collecting storage media, recording weight information of a current storage cluster as an initial weight, and grouping the media according to fault domains to ensure that the storage media in different fault domains are distributed in different groups;and step 2, recording weight information of the current storage medium, generating a wear degree e of the storage medium according to a writing amount m, a bad block number b, a reading error retry rate r and an official writing life L of the current storage medium in SMART information of the storage medium, and then judging measures taken by the storage cluster according to a distribution situation of the wear degree e between 01. According to the invention, the performance of the storage cluster in a non-idle state is ensured, and the stability and controllability of the storage cluster arealso ensured.

The invention discloses a four-control all-flash storage system. The system comprises four controllers and two hard disk groups. After two controllers belonging to the same fault domain fail, the configuration information of the PCIE Switch chip in the hard disk adapter plate is modified by using the normally working controller, so that the hard disk connected with the fault controller is taken over, the problem that the hard disk cannot be normally accessed after the two controllers fail is avoided, and the stability and reliability of the storage system are improved. In addition, the invention further provides a fault processing method and device for the four-control all-flash storage system and a controller, and the technical effect of the fault processing method and device correspondsto the technical effect of the method.

The invention provides a failure domain name detection method and device, and relates to the technical field of communication, and the method comprises the steps: firstly receiving a uniform resourcelocator (URL), sent by a user, of a to-be-detected webpage, and obtaining the webpage information of the to-be-detected webpage based on the URL; wherein the webpage information comprises at least oneof an IP address, a domain name, a title, a response code and a response body; if the IP address of the domain name cannot be resolved, determining the domain name of which the IP address can be resolved and the domain name is expired as a failure domain name; and if the IP address can be resolved and the domain name is not expired, determining whether the domain name is a failed domain name based on at least one of the title, the response code and the response body. According to the invention, all failure domain names in the recorded domain name data can be discovered in time, the detectionis comprehensive, the accuracy of failure domain name detection is improved, and great convenience is brought to supervision work.

The invention provides a distributed storage slow disk processing method and system, a terminal and a storage medium, and the method comprises the steps: carrying out the slow disk detection of a distributed storage cluster, and screening and marking a slow disk; judging whether isolation of the marked slow disk exceeds a cluster fault domain or not; if yes, reporting a slow disk fault alarm; and if not, reporting a slow disk fault alarm and isolating the slow disk. According to the method, the detected slow disk is marked, the marked slow disk is subjected to fault domain rule judgment, whether the isolation of the marked slow disk conforms to the fault domain or not is judged, and if not, the fault alarm of the slow disk is generated only, and the slow disk is not isolated; therefore, the situation that the availability of the distributed file system is reduced due to direct isolation of the slow disk can be avoided, the fault expansion of the distributed file system is avoided, and the high availability of the distributed file system can be ensured while the adverse effect of the slow disk in the distributed file system on the system performance is solved.

The present invention relates to a fault protection method and a fault protection device for an inter-domain link of a multi-domain network. The invention may be particularly applied to multi-domain networks providing end to end services such as an Ethernet service. Embodiments of the invention use a link protection group for an inter-domain link. Link protection group information relating to the link protection group is used to identify a replacement inter-domain link for a faulty inter-domain link that is configured for an inter-domain service. Once the replacement link is identified, the routing of the inter-domain service may be re-configured from the network element ports of the faulty inter-domain link to the network element ports of the identified second inter-domain link.

The invention discloses an efficient calculation method of probability failure risk assessment based on probability density evolution theory, belonging to the field of risk assessment. Aiming at the rotor disk of aero-engine, the density evolution equation of failure probability is established when probability failure risk assessment is carried out. By using the mapping relation between probability distributions in the density evolution equation of failure probability, the mapping omega 0 of failure domain at the initial time is obtained. Based on the detection probability of nondestructive testing, the detection region is defined in the failure region with corresponding proportion. Then, the mapping omega 0 of the detection domain at the initial time is obtained by using the mapping relation established by the density evolution equation of the failure probability. By integrating the joint probability density function in the failure domain and the detection domain, the failure probability of the roulette disc under the number of cycles N is obtained. The invention guarantees the requirement of the calculation precision of the failure risk assessment, and effectively improves the calculation efficiency of the failure probability.

Techniques and systems are described for enabling local independent failure domains in a host server or datacenter environment. Included is a locally-attached independent failure device (LA-IFD) with an independent data buffer and a local communications bus for attaching to a host server. Techniques for a communications protocol between the LA-IFD and its host server are provided, including: receiving a request to write a data segment to persistent storage; synchronously storing the data segment in a buffered data segment at the LA-IFD and initiating an asynchronous update of the data segment at a remote storage system; sending a write acknowledgement indicating completion to the requestor; and, after receiving a completion notification from the remote storage system, removing the buffered data segment from the LA-IFD. In some cases, techniques allow a host server and LA-IFD pair to monitor one another for failures and implement a modified protocol in the event of unavailability.