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Status Delivered
Created by Guest
Created on Jun 28, 2019

Optimization over SVC KSYS: Storage re-mapping process during "move dr_test=yes"

The way of handling actions on SVC by KSYS during DR Test is not correct/optimal. From the storage perspective, DR Test actions (move dr_test=yes) can be divided into the following stages, all on storage array running at BACKUP site:

1. Removal of FlashCopy mappings for 3rd copy volumes (clones)
2. Unmapping of 2nd copy volumes (MetroMirror targets) from SVC hosts related to HG
3. Mapping of 3rd copy volumes to SVC hosts related to HG

Actions 2 and 3 are running very very slow, a few or even over a dozen minutes. Based on monitoring of files created by KSYS during stages 2 and 3 in /var/ksys/tmp directory, we suspect, that KSYS scans whole SVC hosts and volumes configuration. For example, it creates a temporary file for each SVC host definition and probably performs some findings/checks. It is not needed and takes time.

Probably theses steps may be optimized for only objects related to HG.

Idea priority Medium
  • Guest
    Dec 10, 2020

    Delivered in 1.4.0

  • Guest
    Jul 25, 2019


    Thanks for identifying this problem. We appreciate the same. We will prioritize this high in our planning. We will update you once implemented