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What is the limit on the number of hops in a cascaded SnapMirror?

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Applies to

ONTAP 9

Answer

There is no actual limit on the number of hops in a cascade.

Notes:

  • It is required to consider the current volume snapshot limit and ability to schedule and execute relationships so that they work as expected (which is why the general recommendation is to not go beyond tertiary cascades).
  • Each hop will lock a snapshot as a base/common snapshot and that could cause problems if the schedules are not staggered enough so that relevant snapshots get transferred down the chain to the last node before it all starts over again.
  • Two 'hops' for a relationship (a cascade to a tertiary location) have been tested extensively while cascading beyond two hops has had limited testing.

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