Cluster system, cluster system control method, server device, control method, and non-transitory computer-readable medium storing program

Patent metadata

Field	Value
Publication number	US-11223515-B2
Application number	US-201816642096-A
Country	US
Kind code	B2
Filing date	May 17, 2018
Priority date	Sep 6, 2017
Publication date	Jan 11, 2022
Grant date	Jan 11, 2022

Abstract

The present disclosure is to more reliably determine whether an active-system server appropriately provides a service to a client. A cluster system ( 1 ) includes an active-system server ( 2 ) that provides a predetermined service to a client device through a network ( 4 ) and a standby-system server ( 3 ) that provides the predetermined service to the client device in place of the active-system server ( 2 ) when an abnormality occurs in the active-system server ( 2 ). The standby-system server ( 3 ) includes a monitoring unit ( 6 ) that accesses the predetermined service provided by the active-system server ( 2 ) through the network ( 4 ) to monitor whether the predetermined service is normally accessible. The active-system server ( 2 ) includes a cluster controlling unit ( 5 ) that performs a failover when the monitoring unit ( 6 ) of the standby-system server ( 3 ) determines that the predetermined service provided by the active-system server ( 2 ) is not normally accessible.

First claim

What is claimed is:

1. A cluster system comprising:
an active-system server device configured to provide a predetermined service to a client device through a network; and
a standby-system server device configured to provide the predetermined service to the client device in place of the active-system server device when an abnormality occurs in the active-system server device, wherein
the standby-system server device comprises:
at least one first memory storing program instructions; and
at least one first processor configured to execute the instructions stored in the first memory to:
access the predetermined service provided by the active-system server device through the network and perform monitoring processing in accordance with a protocol of the predetermined service to monitor whether the predetermined service is normally accessible; and monitor an operating system of the standby-system server device itself, and
the active-system server device comprises:
at least one second memory storing program instructions; and
at least one second processor configured to execute the instructions stored in the second memory to:
perform a failover when n 2 /n 1 is greater than a predetermined value, n 1 being the number of the stand-by system server devices in which an abnormality has not been detected based on monitoring itself, n 1 being greater than or equal to 1, and n 2 being, of the n 1 standby-system server devices, the number of the standby-system server devices which have determined that the predetermined service provided by the active-system server device is not normally accessible, n 2 being greater than or equal to 1, and
refrain from performing the failover when n 2 /n 1 is not greater than the predetermined value.

2. The cluster system according to claim 1 , wherein
the second processor is further configured to execute the instructions stored in the second memory to monitor an operating state of the active-system server device itself, and
the second processor is further configured to execute the instructions stored in the second memory to determine, based on a monitoring result by the active-system server device, whether to perform a failover when an abnormality has been detected in all the standby-system server devices.

3. The cluster system according to claim 1 , wherein the network is a public LAN, and is a different network from an interconnect LAN used to mutually perform life-and-death monitoring between the active-system server device and the standby-system server device.

4. A server device comprising:
at least one memory storing program instructions; and
at least one processor configured to execute the instructions to:
provide a predetermined service to a client device through a network;
acquire a monitoring result transmitted from a standby-system server device configured to access the predetermined service provided by the server through the network, perform monitoring processing in accordance with a protocol of the predetermined service to monitor whether the predetermined service is normally accessible, and monitor an operating state of the standby-system server device itself;
perform a failover when n 2 /n 1 is greater than a predetermined value, n 1 being the number of the stand-by system server devices in which an abnormality has not been detected based on monitoring itself, n 1 being greater than or equal to 1, and n 2 being, of the n 1 standby-system server devices, the number of the standby-system server devices which have determined that the predetermined service provided by the server device is not normally accessible, n 2 being greater than or equal to 1, and
refrain from performing the failover when n 2 /n 1 is not greater than the predetermined value,
wherein the standby-system server device is configured to take over the providing the predetermined service to the client device when the failover is performed.

5. A control method comprising:
providing a predetermined service to a client device through a network;
acquiring a monitoring result transmitted from a standby-system server device configured to access the predetermined service through the network, perform monitoring processing in accordance with a protocol of the predetermined service to monitor whether the predetermined service is normally accessible, and monitor an operating state of the standby-system server device itself;
performing a failover when n 2 /n 1 is greater than a predetermined value, n 1 being the number of the stand-by system server devices in which an abnormality has not been detected based on monitoring itself, n 1 being greater than or equal to 1, and n 2 being, of the n 1 standby-system server devices, the number of the standby-system server devices which have determined that the predetermined service provided by the server device is not normally accessible, n 2 being greater than or equal to 1, and
refraining from performing the failover when n 2 /n 1 is not greater than the predetermined value,
wherein the standby-system server device is configured to take over the providing the predetermined service to the client device when the failover is performed.

Assignees

• Nec Corp

Inventors

• Osawa Ryosuke

Classifications

• H04L41/0654 Primary

  using network fault recovery (ring fault isolation or reconfiguration in loop networks without recovery actions by a network management system H04L12/437) · CPC title

• H04L69/40 Primary

  for recovering from a failure of a protocol instance or entity, e.g. service redundancy protocols, protocol state redundancy or protocol service redirection (management of faults, events, alarms or notifications in data switching networks H04L41/06) · CPC title

• G06F11/20

  using active fault-masking, e.g. by switching out faulty elements or by switching in spare elements · CPC title

• G06F11/3006

  where the computing system is distributed, e.g. networked systems, clusters, multiprocessor systems (multiprogramming arrangements G06F9/46; allocation of resources G06F9/50) · CPC title

• H04L41/5012

  determining service availability, e.g. which services are available at a certain point in time · CPC title