International Business Machines Corporation

Geoffrey E Miller

Harry M Yudenfriend

Dale Francis Riedy, Jr

Scott M Carlson

Marisa Freidhof

Kershaw S Mehta

Scott Thomas Marcotte

James M Showalter

Susan M Kimmel

Mary Ng

A computer program product is provided for performing a method including: receiving transmission data over a selected time interval for each of a plurality of communication paths; calculating an average round-trip transmission time for each of the plurality of communication paths over the time interval; comparing an average round-trip transmission time for a communication path having the highest average round-trip transmission time to a threshold value and to a multiple of an average round-trip transmission time for a communication path having the lowest average round-trip transmission time; and determining, based on a result of comparing the highest round-trip transmission time to the threshold value and to a multiple of the lowest round-trip transmission time, whether the time period indicates a delay in communication between the I/O subsystem and the control unit requiring at least one of a monitoring action and a recovery action.

Monitoring network performance and detecting network faults using round trip transmission times

A method of processing communications includes: receiving transmission data over a selected time interval for each of a plurality of communication paths between a host processor and a control unit configured to control at least one I/O device; calculating an average round-trip transmission time for each of the communication paths over the time interval; comparing an average round-trip transmission time for a communication path having the highest average round-trip transmission time to a threshold value and to a multiple of an average round-trip transmission time for a communication path having the lowest average round-trip transmission time; and determining, based on comparing the highest round-trip transmission time to the threshold value and to a multiple of the lowest round-trip transmission time, whether the time period indicates a delay in communication between the I/O subsystem and the control unit requiring at least one of a monitoring action and a recovery action.

A method comprising, sending an instruction from a validator member of a sysplex to a second member of a sysplex to prevent operations that alter a sysplex namespace, determining whether the validator member of the sysplex is communicative with the second member of the sysplex and whether the members of the sysplex retain current sysplex status information, sending an instruction from the validator member to the second member to send a first namespace attribute data associated with the second member to the validator member responsive to determining that the validator member of the sysplex is communicative with the second member of the sysplex and the members of the sysplex retain current sysplex status information, determining whether the first namespace attribute data associated with the second member is consistent with a second namespace attribute data, and sending an instruction to correct the first namespace attribute data.

Validation and correction in a distributed namespace

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Highland, NY, United States of America

Geoffrey E Miller