When you see ICL or “InterCluster LIF,” think
SnapMirror/SnapVault. ICL’s are interfaces totally dedicated to
replication between clusters, that’s all they can do. Here’s a couple
important things to think about:
1.
There are two kinds of replication in CDOT:
a. IntraCluster:
this means volume move from one node to the other within the cluster.
This occurs using SnapMirror via the private 10Gb cluster network.
b. InterCluster:
This means SnapMirror or SnapVault to another cluster, which occurs over TR’s
shared network.
2. All of a cluster’s SnapMirror and SnapVault to
other clusters only occur via the ICL’s.
3.
ICLs work on two kinds of ports: Role=Data or
Role=InterCluster. Remember, you can assign a role to a port so that only
LIFs with compatible roles will ever land there.
4.
Create at least 1 ICL per node. ICL’s
can’t be failed over between nodes, they are dedicated to that node.
5.
In 8.2, a node’s ICL’s can only be in a single
network. In 8.3 IPSpaces are re-introduced and allow multiple ICL’s
in multiple IPSpaces per node.
