A FAS2750 cluster administrator experiences network issues during replication updates that pass over a low- bandwidth WAN link to their DR site. They…

SnapMirror network compression is a configurable attribute on a per-relationship basis, not a global setting. An administrator can enable or disable this feature on an existing SnapMirror relationship using the snapmirror modify command with the -is-network-compression-enabled true parameter. If a data transfer is already in progress for that specific relationship, the change will not take effect until the next transfer. Therefore, the current transfer must be stopped with snapmirror abort, the relationship modified, and the transfer then restarted using snapmirror resume or snapmirror update.

A. Deleting and re-creating jobs is unnecessary and inefficient. The snapmirror modify command is designed to alter the properties of existing relationships without requiring re-initialization.

B. Network compression is not a global option. It is a per-relationship attribute, which allows the administrator to enable it selectively only for the desired WAN-based jobs.

D. SnapMirror network compression is a standard software feature of ONTAP. It is fully supported on the FAS2750 platform and is not limited by the hardware model.

1. NetApp ONTAP 9.10.1 Command Reference, snapmirror modify page:

The documentation for the snapmirror modify command explicitly lists -is-network-compression-enabled {true|false} as a parameter that can be used to "modify the attributes of a SnapMirror relationship." This confirms that an existing relationship can be changed without deletion and re-creation.

2. NetApp ONTAP 9.10.1 Data Protection Guide, "Modify a SnapMirror relationship" section:

This guide states: "You can modify the properties of a SnapMirror relationship at any time by using the snapmirror modify command... If a transfer is in progress, the modified properties are not used until the next transfer." This supports the need to stop the current transfer for the new setting to be applied immediately.

3. NetApp TR-4015: SnapMirror Configuration and Best Practices Guide for ONTAP 9, Section 5.5 Network Compression:

"Network compression is disabled by default but can be enabled on a per-relationship basis... It can be enabled during relationship creation (snapmirror create) or at any time later (snapmirror modify)." This confirms the setting is per-relationship and can be modified post-creation, directly contradicting options A and B. The document makes no mention of hardware platform limitations, invalidating option D.