SCSI 15000 versus 2x10000 SATA on RAID 0?

[samsc]

Hi Richard

Yes i do have the latest drivers from atto installed, and just to add some more detail, the SCSi drive is a Fujitsu MAX3073NP, and the SATA drives are the Western Digital Raptors WD1500ADFD.

I can't believe i never new that about DV, doh, i am just about to encode the same video footage as Motion JPEG at 60% and see how they compare.

Cheers

Gareth

there are many different dv settings too.

you need to check which dv codec you used.

you need to email me your pdf profile so i can check your files.

[gazzer82]

Hmm,

I have just run a test with motion jpeg and the results are very odd, here are the complete results.

SATA
Motion JPEG 60% - 1280x720 = 2 Layers before frames dropped
Motion JPEG 60% - 720x576 = 4 Layers before frames dropped
DV 100% - 720x576 = 8 Layers

SCSI
Motion JPEG 60% - 1280x720 = 1 Layers before frames dropped
Motion JPEG 60% - 720x576 = 2 Layers before frames dropped
DV 100% - 720x576 = 7 Layers

Very very odd.

PDF profile on it's way asap.

Gareth

[Gian]

Sorry did not get back here for long time,... I am touring at the moment, so not so much time. I did tryied some of our files on a single diskd before.

Richard I will make some better tests soon I get back,.. but from what I recall, without the RAID set up, I can achive on a single SATA drive, sometimes 3, sometimes 2 original DV files from the library. Depends a lot on how much information you have on the movie.

Regarding big files (like 2400 x 600) or HD 1920 x 1080, with compressions in beetween 60 and 80% ( I got upper that 70% gets bad, but some movies, speccially with black background and white lettering, gets some strange white points arround the letters.) I never got those movies playing at 30 fps.
They always still arround 27, 28, sometimes less. The RAID gets them to play at 30 fps.

Funny, I had a movie 2400 x 600 ( black and white on the begining, and then gets some colors), on the BW he got the 30 fps on a single SATA drive, when reach the colored part, drops to 24, 25 fps. Very funny....

I will make some more tests next week soon I get back. Cheers to all....

[OlliR]

After having a talk with Oli Metcalfe this summer when he was with Muse (and his Catalysts) at Rock am Ring I tried the 3 x 500G SATA Raid Level 0 (Striped).
Works fine for me. Access time seems to be just a little slower than the 15K SCSI times.

I ran 2 full HD 1920 x 1080 Photo-JPEG 75% movies at 30 fps.

Starting another HD playback led to dropping frames on two layers.

But I could run another 720x576 Photo-JPEG 75% movie at 30 fps.

I will do some more testing with SD Movies on more layers.

System setup: Mac Pro 8xCore, 4 GB, 1x500GB System, 3x500GB Content

[samsc]

this all depends on what you want to do-

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i test hundreds of codecs- i have very clear graphs- showing performance on many different systems.
im working on presenting them a little clearer- in talking to people the detail was too technical.

[samsc]

this all depends on what you want to do-

----

i test hundreds of codecs- i have very clear graphs- showing performance on many different systems.
im working on presenting them a little clearer- in talking to people the detail was too technical.

[samsc]

Hmm,
Very very odd.

PDF profile on it's way asap.

Gareth

yes your results are odd. and not what you got the day before.

do you have a terminator on your scsi disc?

[samsc]

i test all sorts of systems-
i have just spent several weeks looking at photojpeg performance-

the graphs here are using an esperance 2GB RAM disk- which give me the absolute maximum possible performance- because 'disc' speed is almost infinite.
you cant get any faster than this - right now - whatever RAID you use.

these tests are for 4 layers - on 8core intel and quad g5.
and for 2 layers - with 2 layers its possible to do almost anything-

this is a graph of 84 photojpeg files - in 5% steps from 35% to 100% - and from size 640x480 to 1920x1080.

these graphs show the raw cpu time necessary to do these things.

the axis are codec and time in milliseconds.

the clumping of points around 40ms is when testing has broken down and tests are not valid.

intel 3.0ghz is faster than quad g5 at most data points - but not all.

[gazzer82]

Cheers for sharing that, really interesting to see the performance hit going from 95% to 100%.

In answer to your question, yes the drive is terminated. My results may have been slightly different as i re-ran things to double check the results and it seems to depend a small amount on the exact clip selelcted as to how may layers will play back.

Cheers

Gareth

[samsc]

Cheers for sharing that, really interesting to see the performance hit going from 95% to 100%.
Gareth

100% is uncompressed.

there is also a hit from 70% to 75%

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inconcistent results means that something is wrong with your setup.

you have inconisistent monitor refresh rates too.

neither of your results are trustworthy - yet.

your scsi value is too low.
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richard