Interoperability with ShadowImage

Supported functions:

• Using a V-VOL as a ShadowImage primary volume (P-VOL) or secondary volume (S-VOL).

  If a pool contains both the P-VOL and S-VOL of a pair and deduplication is enabled for the pool, only one copy of the P-VOL data is saved physically due to deduplication of the P-VOL and S-VOL data. If you want to protect the P-VOL data, use separate pools for the P-VOL and S-VOL.

• Expanding the capacity of a V-VOL used in ShadowImage.
• Reclaiming zero pages (the pair status must be PSUS). Only these pair statuses are enabled:
  • SMPL, status of an unpaired volume
  • PSUS

Functions not supported:

• Using a pool-VOL as a ShadowImage P-VOL or S-VOL.
• Reclaiming zero pages of a V-VOL if the status is other than PSUS.
• Using a deduplication system data volume as a ShadowImage P-VOL or S-VOL.

In addition, you can use Dynamic Provisioning in combination with ShadowImage to replicate V-VOLs. You cannot specify a Dynamic Provisioning pool-VOL as a primary volume or secondary volume.

This table lists the interaction when the ShadowImage primary volume and secondary volume are also DRD-VOLs.