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Customizing a replication policy

You can use a default or custom policy when you create a replication relationship. For a custom SnapVault or unified replication policy, you must define one or more rules that determine which Snapshot copies are transferred during initialization and update. You might also want to define a schedule for creating local Snapshot copies on the destination.

  • Creating a custom replication policy
    You can create a custom replication policy if the default policy for a relationship is not suitable. You might want to compress data in a network transfer, for example, or modify the number of attempts SnapMirror makes to transfer Snapshot copies.
  • Defining a rule for a policy
    For custom policies with the vault or mirror-vault policy type, you must define at least one rule that determines which Snapshot copies are transferred during initialization and update. You can also define rules for default policies with the vault or mirror-vault policy type.
  • Defining a schedule for creating a local copy on the destination
    For SnapVault and unified replication relationships, you can protect against the possibility that an updated Snapshot copy is corrupted by creating a copy of the last transferred Snapshot copy on the destination. This “local copy” is retained regardless of the retention rules on the source, so that even if the Snapshot originally transferred by SnapMirror is no longer available on the source, a copy of it will be available on the destination.
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