19-10
UserGuide for Cisco Digital Media Manager5.4.x
OL-15762-05
Chapter19 Content Distribution and Delivery
Concepts
Limit DMS-CD Disruptions to DMP Performance
Improper scheduling practices and improper WAN bandwidth parameters in your media network might
cause DMS-CD to disrupt playback performance temporarily on DMPs. The disruption affects multicast
video streams, HD videos, Shockwave Flash animations, and image assets that these DMPs show on their
attached presentation systems while simultaneously downloading newly provisioned, large assets. When
this disruption occurs:
•
Videos might become fragmented (contain artifacts), drop frames, or cut out during playback.
•
SWF animations might play slowly.
•
Images might redraw slowly.
•
DMPs might restart unexpectedly, in rare instances.
You can configure bandwidth restrictions in your WAN that should help to alleviate these symptoms or
eliminate them completely, depending on the system load of each DMP.
E.
Total DMS-CD
throughput
Gather these values.
•(E1) What is the throughput of your DMM appliance?
2
•(E2) What value is in effect for the Concurrency prefer ence setting?
•(E3) What DMP Incoming Transfer Rate value did you record in row A?
•(E4) What is the sum when you add E2 to E3?
Q.
Compare the values of E1 and E4. The lower value is exactly what?
F.
Shortest
possible
duration for
a parallel
deployment
The quotient when you divide one value by another.
•(F1) What Total Data to Be Deployed value did you record in row B ?
•(F2) What Total DMS-CD Throughput value did you record in row E?
Q.
What is the quotient (counted in hours) when you divide F1 by F2?
1. Potentially including any QoS policies that limit how much of your total bandwidth capacity DMS-CD is permitted to use.
2. Because your DMM appliance uses a 1 GB network adapter for Ethernet, its throughput is likely to be at least 40 mbits in any modern network that is
notoverloaded. If you do not know how to measure server throughput, contact your network administrator.
Table19-2 Pre-Planning Worksheet for One DMS-CD Deployment (continued)
Factor Definition and Supporting Data