The steps provided in this appendix provide an example of configuring cascaded replication. For this example, the steps configure the implementation in the following figure.

Figure 43.    Cascaded replication

The configuration described in this appendix triggers replication from Cluster A only when a snapshot of the specified source directory on Cluster A is taken. For more information about this option, see Whenever a snapshot of the source directory is taken and SnapshotIQ and SyncIQ. To implement the cascaded replication in Figure 43, log in to CLI of each cluster, and perform the following steps:

1. On Cluster A, configure replication from Cluster A to Cluster B based on when a snapshot of the source directory is taken:

IsilonClusterA# isi sync policies create --name=pol_a_b sync --source-root-path=/ifs/data/cluster1/pol_a_b --target-host=[Cluster B IP Address] --target-path=/ifs/data/cluster1/pol_a_b --schedule=when-snapshot-taken

Modify policy pol_a_b to specify a snapshot naming pattern and archive snapshots:

IsilonClusterA# isi sync policies modify pol_a_b --target-snapshot-pattern=SIQ_%{SrcCluster}-%{PolicyName}-%Y-%m-%d_%H-%M-%S --target-snapshot-archive=true

Confirm policy pol_a_b is configured for when a snapshot is taken, the snapshot is archived, and the naming pattern is specified:

IsilonClusterA# isi sync policies view pol_a_b

<Output truncated – Confirm the fields listed below>

.

.

.

Target Snapshot Archive: Yes

Target Snapshot Pattern: SIQ_%{SrcCluster}-%{PolicyName}-%Y-%m-%d_%H-%M-%S

Target Snapshot Expiration: Never

Schedule: when-snapshot-taken

2. On Cluster B, configure replication from Cluster B to Cluster C based on when a snapshot of the source directory is taken:

IsilonClusterB# isi sync policies create --name=pol_b_c sync --source-root-path=/ifs/data/cluster1/pol_a_b --target-host=[Cluster C IP Address] --target-path=/ifs/data/cluster1/pol_a_b --schedule=when-snapshot-taken

Modify policy pol_b_c to specify a snapshot naming pattern and archive snapshots:

IsilonClusterB# isi sync policies modify pol_b_c --target-snapshot-pattern=SIQ_%{SrcCluster}-%{PolicyName}-%Y-%m-%d_%H-%M-%S --target-snapshot-archive=true

Confirm policy pol_b_c is configured for when a snapshot is taken, the snapshot is archived, and the naming pattern is specified:

IsilonClusterB# isi sync policies view pol_b_c

<Output truncated – Confirm the fields listed below>

.

.

.

Target Snapshot Archive: Yes

Target Snapshot Pattern: SIQ_%{SrcCluster}-%{PolicyName}-%Y-%m-%d_%H-%M-%S

Target Snapshot Expiration: Never

Schedule: when-snapshot-taken

3. On Cluster C, configure replication from Cluster C to Cluster D based on when a snapshot of the source directory is taken:

IsilonClusterC# isi sync policies create --name=pol_c_d sync --source-root-path=/ifs/data/cluster1/pol_a_b --target-host=[Cluster D IP Address] --target-path=/ifs/data/cluster1/pol_a_b --schedule=when-snapshot-taken

Modify policy pol_c_d to specify a snapshot naming pattern and archive snapshots:

IsilonClusterC# isi sync policies modify pol_c_d --target-snapshot-pattern=SIQ_%{SrcCluster}-%{PolicyName}-%Y-%m-%d_%H-%M-%S --target-snapshot-archive=true

Confirm policy pol_c_d is configured for when a snapshot is taken, the snapshot is archived, and the naming pattern is specified:

IsilonClusterC# isi sync policies view pol_c_d

<Output truncated – Confirm the fields listed below>

.

.

.

Target Snapshot Archive: Yes

Target Snapshot Pattern: SIQ_%{SrcCluster}-%{PolicyName}-%Y-%m-%d_%H-%M-%S

Target Snapshot Expiration: Never

Schedule: when-snapshot-taken