Define a rule for a policy
For custom policies with the “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 “mirror-vault” policy type.
Every policy with the “mirror-vault” policy type must have a rule that specifies which snapshot copies to replicate. The rule “bi-monthly”, for example, indicates that only snapshot copies assigned the SnapMirror label “bi-monthly” should be replicated. You assign the SnapMirror label when you configure Element snapshot copies.
Each policy type is associated with one or more system-defined rules. These rules are automatically assigned to a policy when you specify its policy type. The table below shows the system-defined rules.
System-defined rule |
Used in policy types |
Result |
---|---|---|
sm_created |
async-mirror, mirror-vault |
A snapshot copy created by SnapMirror is transferred on initialization and update. |
daily |
mirror-vault |
New snapshot copies on the source with the SnapMirror label “daily” are transferred on initialization and update. |
weekly |
mirror-vault |
New snapshot copies on the source with the SnapMirror label “weekly” are transferred on initialization and update. |
monthly |
mirror-vault |
New snapshot copies on the source with the SnapMirror label “monthly” are transferred on initialization and update. |
You can specify additional rules as needed, for default or custom policies. For example:
-
For the default
MirrorAndVault
policy, you might create a rule called “bi-monthly” to match snapshot copies on the source with the “bi-monthly” SnapMirror label. -
For a custom policy with the “mirror-vault” policy type, you might create a rule called “bi-weekly” to match snapshot copies on the source with the “bi-weekly” SnapMirror label.
-
Define a rule for a policy:
snapmirror policy add-rule -vserver SVM -policy policy_for_rule -snapmirror-label snapmirror-label -keep retention_count
For complete command syntax, see the man page.
The following example adds a rule with the SnapMirror label
bi-monthly
to the defaultMirrorAndVault
policy:cluster_dst::> snapmirror policy add-rule -vserver svm1 -policy MirrorAndVault -snapmirror-label bi-monthly -keep 6
The following example adds a rule with the SnapMirror label
bi-weekly
to the custommy_snapvault
policy:cluster_dst::> snapmirror policy add-rule -vserver svm1 -policy my_snapvault -snapmirror-label bi-weekly -keep 26
The following example adds a rule with the SnapMirror label
app_consistent
to the customSync
policy:cluster_dst::> snapmirror policy add-rule -vserver svm1 -policy Sync -snapmirror-label app_consistent -keep 1
You can then replicate snapshot copies from the source cluster that match this SnapMirror label:
cluster_src::> snapshot create -vserver vs1 -volume vol1 -snapshot snapshot1 -snapmirror-label app_consistent