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Status Delivered
Workspace IBM Spectrum Virtualize / FlashSystem
Created by Guest
Created on Dec 9, 2019

RELATED IDEAS

Monitoring of host latency during Global Mirror for Spectrum Virtualize

Customers use GM when there is a requirement to maintain an aggressive RPO. However during GM there could be instances when the quality of link between DC & DR can deteriorate due to packet losses or high latency which could be a temporary phenomena. This affects host latency immediately leading to very high read as well as write response times which is unacceptable when customer is running a critical workload. While GMlinktolerance parameter can be used to set the period for which such high latency can be tolerated, sometimes it does not still serve the purpose due to quick escalations from users in case of high latency. Hence it would be use to at least send an alert to system administrator whenever there is a 10 second period of high latency. Customer can take a call to whether suspend replication or know whenever there is a period of high latency. They can deploy in-house automated tools to suspend latency even before the storage suspends it with a 1920 error.

Idea priority Urgent
  • Admin
    Philip Clark
    Reply
    |     Oct 2, 2022

    New policy-based async replication introduced in 3Q22 (8.5.2.1) automatically switches between cycling and journaling modes to maintain RPO target without impacting host latency.


    Thanks,
    SpecV Team

    philipclark@ibm.com

0 MERGED

SVC GMCV Frezze Time Informational Message

Merged
At SVC Primary and Auxiliary sites, create Information message in log at beginning of GMCV cycle. Create another informational message then cycle complete data transfer. New message should include Consistency Group ID or GM relationship ID.
over 11 years ago in IBM Spectrum Virtualize / FlashSystem 2 Delivered

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