Content Comparison

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• A simplified single edition offering

• Reduced data transfer during resynchronization with Geographic Mirroring Compression

• Reduction in Time Required to Perform CRG Switchover for Selected Configurations

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With this enhancement, PowerHA can now compress geographic mirroring data during resynchronization reducing the data transfer required. In addition, on Power10 systems, PowerHA uses the on-chip NX GZIP accelerator if the NX feature is enabled, providing hardware accelerated compression. This enhancement will be available on June 24^th, 2022 for both PowerHA 7.5 and 7.4.

Reduction in Time Required to Perform CRG Switchover for Selected Configurations

Status
colour Yellow title 7.5 HA 5.0.1

Status
colour Green title 7.4 HA 4.6.1

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colour Purple title 7.2 HA 3.8 (IBM i 7.3)

Previously, when performing a switchover of a device Cluster Resource Group (CRG), the job queue specified in the job description for the user performing the switchover was used to vary off and on the IASP. This may result in the switchover taking longer than expected. For example, if the job queue is held or only allows a specific number of active job at a time, the switchover may be held up for a long time. Previously, PowerHA included switchover progress monitoring that visually indicates a job submitted but not yet running to help identify these situations.

PowerHA has been enhanced so that planned switchovers or unplanned failovers will always use the QSYSNOMAX job queue for IASP vary on and off operations regardless of the user initiating the operation. This reduces the chance of a held job queue or hitting the restriction on the maximum number of active jobs in the subsystem, reducing the time required to perform the CRG switchover.

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