Polycom 3725-76302-001O manual Single-server Configuration, Superclustering

Polycom® RealPresence DMA® 7000 System Overview

●Ability to ping the other server’s public physical address

●Ability to ping the default gateway

In the event of a tie, the server already hosting the public virtual address wins.

Failover to the backup server takes about five seconds in the event of a graceful shutdown and about twenty seconds in the event of a power loss or other failure. In the event of a single server failure, two things happen:

●All calls that are being routed through the failed server are terminated (including SIP calls, VMR calls, and routed mode H.323 calls). These users simply need to redial the same number, and they’re placed back into conference or reconnected to the point-to-point call they were in. The standby server takes over the virtual signaling address, so existing registrations and new calls are unaffected.

●Direct mode H.323 point-to-point calls are not dropped, but the bandwidth management system loses track of them. This could result in overuse of the available network bandwidth.

●If the failed server is the active web host for the system management interface, the active user interface sessions end, the web host address automatically migrates to the remaining server, and it becomes the active web host. Administrative users can then log back into the system at the same URL. The system can always be administered via the same address, regardless of which server is the web host.

The internal databases within each Polycom RealPresence DMA system server are fully replicated to the other server in the cluster. If a catastrophic failure of one of the database engines occurs, the system automatically switches itself over to use the database on the other server.

Single-server Configuration

The Polycom RealPresence DMA system is also available in a single-server configuration. This configuration offers all the advantages of the Polycom RealPresence DMA system except the redundancy and fault tolerance at a lower price. It can be upgraded to a two-server cluster at any time.

This manual generally assumes a redundant two-server cluster. Where there are significant differences between the two configurations, those are spelled out.

Superclustering

To provide geographic redundancy and better network traffic management, up to five geographically distributed Polycom RealPresence DMA system clusters (two-server or single-server) can be integrated into a supercluster. All five clusters can be Call Servers (function as gatekeeper, SIP proxy, SIP registrar, and gateway). Up to three can be designated as Conference Managers (manage an MCU resource pool to host conference rooms).

The superclustered Polycom RealPresence DMA systems can be centrally administered and share a common data store. Each cluster maintains a local copy of the data store, and changes are replicated to all the clusters. Most system configuration is supercluster-wide. The exceptions are cluster-specific or server-specific items like network settings and time settings.

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