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DX Object Storage Platform: Remote Replication Configuration

Introduction

The Dell

DX Object Storage Platform allows data to be asynchronously replicated from one DX Object

Storage Cluster to another over a standard IP network. Replication is managed by the DX Content

Router (CR) application located on the DX Cluster Services Node (CSN). The CR identifies data to be

replicated based on filter rules defined by the DX Administrator. The rules are compared to meta-data

stored with the objects to determine which objects are to be replicated to a remote cluster. These

rules allow customized data distribution between multiple clusters. Most of the common replication

topologies are achievable through the web-based management console located on the CSN. However,

more complex replication topologies require advanced configuration through configuration files located

on the CSN. The target audience for this document is advanced DX Storage administrators and support

teams. It is meant to provide instructions on advanced configuration of asynchronous remote

replication through these configuration files.

The CSN provides replication services through the CR application. It also provides a SCSP proxy

interface to the DX Storage Nodes (SN) that allows communication between DX Storage Clusters. This

interface accepts operations from applications and re-directs them to the DX Storage Nodes in the

designated cluster. Asynchronous replication between clusters utilizes the proxy interface to transport

the objects between clusters. The CR application provides two services. The first service is called

Publisher and it is responsible for identifying objects to be replicated based on replication rules set by

DX Administrator and publishing a list of those objects for replication. The second service provided by

CR is called Replicator. The Replicator subscribes to a Publisher, retrieves the list of objects identified

for replication and replicates the objects between clusters. The cluster where data is originated runs

the publisher service. The cluster where the data is to be replicated runs the replicator service.

CSN

Publisher

Proxy

Replication can be configured to support many customized configurations. Replication can be one-way

or two-way. A configuration using one-way replication, from primary to secondary, recognizes a

disaster recovery configuration. Each CSN can run both Publisher and Replicator services enabling two-

way replication for a mirrored configuration. The Publisher service supports multiple channels that

correspond to distinct filter rules, each of which can each be subscribed to by multiple replicators. A

single Replicator can subscribe to multiple Publishers to support a DR roll-up scenario or Replicators

CSN

Replicator

Proxy

1. Replicator requests list of objects stored, updated

or deleted from Publisher

2. Replicator receives and stores list on CSN

3. Replicator instructs SN to replicate each object

4. SN initiates GET request for objects

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