Quote:
Originally Posted by DocuMaker 
Mr. Deap, would you be so kind as to tell us what RAID 0 setup you are using in your system? Are you using a dedicated RAID card or just onboard? Which brand HDD's and how many are you using, and what kind of benchmarks do you get from your drives? Can you successfully record 1080i/p content without stutter, and at what framerate?

Mr. Deap, would you be so kind as to tell us what RAID 0 setup you are using in your system? Are you using a dedicated RAID card or just onboard? Which brand HDD's and how many are you using, and what kind of benchmarks do you get from your drives? Can you successfully record 1080i/p content without stutter, and at what framerate?
Here an overview of what you need.
Quote:
Bandwidth
http://av-info.eu/graphics/bandwidth_SDI.jpg

720p: the image in the 720p60 format has about 0,922 megapixels per frame (1280×720), with 24-bit color per pixel (RGB) and 60 full images per second it needs a bandwidth of about 1.30 Gbps.
1080i: the image in the 1080i60 format has about 2.07 megapixels per frame (1920x1080), with 24-bit color per pixel (RGB) and 60 half-images per second it needs a bandwidth of about 1.46 Gbps.
1080p: the image in the 1080p60 format has about 2.07 megapixels per frame (1920x1080), with 24-bit color per pixel (RGB) and 60 full images per second it needs a bandwidth of about 2.97 Gbps.
Bandwidth
http://av-info.eu/graphics/bandwidth_SDI.jpg

720p: the image in the 720p60 format has about 0,922 megapixels per frame (1280×720), with 24-bit color per pixel (RGB) and 60 full images per second it needs a bandwidth of about 1.30 Gbps.
1080i: the image in the 1080i60 format has about 2.07 megapixels per frame (1920x1080), with 24-bit color per pixel (RGB) and 60 half-images per second it needs a bandwidth of about 1.46 Gbps.
1080p: the image in the 1080p60 format has about 2.07 megapixels per frame (1920x1080), with 24-bit color per pixel (RGB) and 60 full images per second it needs a bandwidth of about 2.97 Gbps.
1.3Gbps=About 165MB/s
My Raid setup is only 2 hard drive using onboard raid. The problem is that it doesn't stay above 165MB all the time which make it difficult to get a stable framerate. That's the reason why I record compressed which give me a better result in that situation.
I'm using 2 Seatgate 7200.10

Seagate 7200.10 chart

I believe my onboard raid is decent & it's very important to make sure that the minimum speed should not go under 165MB.
Well in practice based on the chart & my setup. It look more like I need 4 hard drive rather than just 3 with the Seagate 7200.10.

Though my seagate are old & you will get better performance out of with Seagate 7200.11 or 7200.12 along with the Caviar Black with 3 is enough.
Well as for 1080P 60 it need 376MB/s based on the chart, so...hmmm.... Never mind...

By the way, Like I said I can record 60fps without stuttering in 720P via component using windows media encoder.
Slowed the video to 50% for youtube. You can see that I'm able to record effectively every frame without stuttering.
Took some random video of DMC4 from other user in HD in the original speed.
You can see that I didn't mess up.



































