Use cases for pairing global-active device volumes with ShadowImage or Thin Image

Ops Center High Availability User Guide

File Size
3.9 MB
Part Number

Backing up GAD pair volumes with ShadowImage (SI) or Thin Image (HTI) provides further protection for GAD data in the following ways:

  • When the GAD pair is resynchronized, pair status changes to COPY. While in this status, S-VOL consistency is temporarily lost. You can protect data when in COPY status by pairing the S-VOL with SI or HTI before resynchronizing the GAD pair.
  • Though data in a blocked GAD pair is inconsistent, host activity can continue with the P-VOL or S-VOL. Therefore, before correcting the failure by forcibly deleting the pair, you should pair the volumes with SI or HTI.
  • The SI and HTI pairs can then be copied, and the copies used for other purposes.