Chapter 1 System Overview and Requirements
© 2017 Harmonic Inc. All rights reserved. 17 Harmonic MediaGrid Release 4.1
Harmonic MediaGrid Components
Harmonic provides one network switch, which can only be used for systems with the
ContentServer 3000. However, Harmonic MediaGrid supports several switches. For information
on switches that are currently Harmonic MediaGrid-qualified, contact your Harmonic
representative.
Switches may be qualified for Harmonic MediaGrid based on specifications or testing. If you wish
to have a new switch qualified, please make an effort to obtain data on latency, throughput, non-
blocking fabric, and port buffering from the manufacturer and include it with a qualification
request to your Harmonic representative.
IMPORTANT: The ContentServer 3000/4000 series cannot be connected directly to CX4 ports.
If you are supplying a switch for a Harmonic MediaGrid system with the ContentServer 3000 or
4000, the following switch functionality is required:
Full wire-speed, non-blocking architecture
Latency of less than 5uS
Port buffers of 10 MB per port
ContentDirector
ContentDirectors act as the overall file system controllers, managing the distribution of data
throughout the system and providing data maps to clients for writing and retrieval of media from
the system. In addition, the ContentDirector performs storage management and file
housekeeping functions.
Two models of ContentDirectors are available. Refer to ContentDirector 1000F and High Performance
ContentDirector 2000C for additional information about this component.
ContentServer
ContentServers store data on disk drives and deliver files upon request from desktop clients or
from legacy clients through a ContentBridge. ContentServers with RAID support have dual active-
active controllers and redundant data paths to protect against any storage node failures.
ContentServer 3000 (16-drive, 3RU server): The ContentServer 3000 is available with ether
1 GbE or 10 GbE Ethernet ports for connections to the network switch. Refer to ContentServer
3000 for additional information about this server.
ContentServer 4000 (24-drive, 4RU server): The ContentServer 4000 is equipped with 10
GbE Ethernet ports. Refer to ContentServer 4000 for additional information about this server.
ContentStore
ContentStores can be connected to ContentServers to provide additional storage bandwidth and
capacity for holding user data.
ContentStore 3160 (16-drive, 3RU server): In single stack, up to 5 ContentStore 3160
nodes can connect to the ContentServer 3000. Refer to ContentStore 3160 for additional
information about this server.
ContentStore 4240 (24-drive, 4RU server): In a single stack, up to 4 ContentStore 4240
nodes can connect to the ContentServer 4000. Refer to ContentStore 4240 for additional
information.
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