Configuration and Tuning GPFS for Digital Media ... - IBM Redbooks

Table 1-3 Broadcasting profile
1.3.4 Post-production environments
Compared to broadcasting, the post-production (mastering and distribution)
environments require much higher bandwidth, as the resolution of the content is
higher. Also the access behavior in post-production environments is more
sequential, since this is predefined work, which involves “shuttle-in”, then work
with the editing or color correction stations. Hence, the material will be opened
for read, updated on the workstation and written/rendered back to the storage.
Table 1-4 shows the profile for post-production environments.
Table 1-4 Post-production profile
Broadcasting
Streaming rate 25 / 50 Mbit/s
Access behavior Sequential or random
Block size used (application) 64 / 128 / 256 KB
Number of concurrent occurrences Small: 1-5
Medium 5-15
Large 15-...
Read/write ratio 60/40%
Remarks Read/write in parallel audio and video
Mixed/divided depending on application
post-production
streaming rate 3000-5000 Mbps (400-600 MBps)
access behavior sequential to random
block size used (application) 256 KB
number of concurrent occurrences small 1-3
medium 3-10
large 10-...
read/write ratio 70/30%
remarks read/write in parallel audio and video
mixed/divided depending on application.
As it is not possible in this book to cover all of the digital media requirements
needed to build up a reliable, scalable and performing infrastructure, we will
concentrate on broadcasting.
Chapter 1. Introduction to digital media 9