Maintaining computer system operability
First Claim
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1. A method comprising:
- in response to a requirement for failover from a first resource to a second resource, testing, by one or more processors, an availability of the second resource, wherein the first and second resources are redundant resources of a network-connected data processing apparatus that is communicatively coupled to at least one host computer;
in response to a positive determination of the availability of the second resource, initiating, by one or more processors, the failover; and
in response to a negative determination of the availability of the second resource, providing, by one or more processors, an indication of unavailability, wherein the network-connected data processing apparatus is communicatively coupled to at least one host computer,wherein a first failover is performed from the second resource to the first resource in response to a requirement to take the second resource out of operational service, the method further comprising;
in response to a requirement for a second failover from a first resource to a second resource, testing the availability of the second resource;
in response to a positive determination of the availability of the second resource, initiating the second failover; and
in response to a negative determination of the availability of the second resource, providing an indication of unavailability of the second resource.
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Abstract
Maintaining operability of a network-connected data processing apparatus is provided. In response to a requirement for failover from a first resource to a second resource, one or more processors tests an availability of the second resource, wherein the first and second resources are redundant resources of a network-connected data processing apparatus that is communicatively coupled to at least one host computer. In response to a positive determination of the availability of the second resource, one or more processors initiates the failover; and in response to a negative determination of the availability of the second resource, one or more processors provides an indication of unavailability.
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Citations
17 Claims
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1. A method comprising:
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in response to a requirement for failover from a first resource to a second resource, testing, by one or more processors, an availability of the second resource, wherein the first and second resources are redundant resources of a network-connected data processing apparatus that is communicatively coupled to at least one host computer; in response to a positive determination of the availability of the second resource, initiating, by one or more processors, the failover; and in response to a negative determination of the availability of the second resource, providing, by one or more processors, an indication of unavailability, wherein the network-connected data processing apparatus is communicatively coupled to at least one host computer, wherein a first failover is performed from the second resource to the first resource in response to a requirement to take the second resource out of operational service, the method further comprising; in response to a requirement for a second failover from a first resource to a second resource, testing the availability of the second resource; in response to a positive determination of the availability of the second resource, initiating the second failover; and in response to a negative determination of the availability of the second resource, providing an indication of unavailability of the second resource. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A computer program product comprising a computer readable storage medium having program instructions embodied therewith, the program instructions executable by a processor to cause the processor to perform a method comprising:
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in response to a requirement for failover from a first resource to a second resource, testing, by one or more processors, an availability of the second resource, wherein the first and second resources are redundant resources of a network-connected data processing apparatus that is communicatively coupled to at least one host computer; in response to a positive determination of the availability of the second resource, initiating the failover; and in response to a negative determination of the availability of the second resource, providing an indication of unavailability, wherein testing the availability of the second resource comprises an update controller component requesting that the at least one host computer sends input/output commands via the second resource, and wherein the at least one host computer replies to the update controller component. - View Dependent Claims (9, 10, 11, 12)
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13. A computer system comprising:
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a memory; and a processor in communication with the memory, wherein the computer system is configured to perform a method, the method comprising; in response to a requirement for failover from a first resource to a second resource, testing, by one or more processors, an availability of the second resource, wherein the first and second resources are redundant resources of a network-connected data processing apparatus that is communicatively coupled to at least one host computer; in response to a positive determination of the availability of the second resource, initiating the failover; and in response to a negative determination of the availability of the second resource, providing an indication of unavailability, wherein the requirement for failover from the first resource is determined automatically in response to a request to take one of more resources out of operational service to carry out one or more resource updates. - View Dependent Claims (14, 15, 16, 17)
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Specification