Tentacle wrote:
Ah, but it is. The RedOne will do 2540p at 30 fps RAW if you record to external RAID. The package of two laptop HDs in RAID 0 isn't fast enough to take more than 4K with lossy codec, but that doesn't mean it can't be done.
The company decided to discontinue the option for RAW 2540p output for now because it was technically difficult and the external HD array solution made it cumbersome, but that doesn't mean it couldn't be done in the first place.
If we assume lossless RAW compression of about 1 Mpixel to 1.2 Mbyte (seems fair, Canon RAW is comparable) then 30 fps at 12 Mpixel will mean around 400 to 450 MB/sec output. Group 4 high-end hard disks together in RAID 0 and you'll easily push this much data onto hard disk. Two 3 Gbit SAS links should do the trick....Show more →
Would you mind providing a reference for the maximum fps at full resolution - I have not found anything other than 30fps. And while I am feeling lazy, would you mind listing the hard drives that can write at >100MBps sustained - though I don't think it really matters, since you can just use 10-15 slower disks and handwave the rest.
Now that you have a 10lb camera (no lens) and a large pile of hard disks - who do you expect to use this in situations calling for a dslr?
Would you mind providing a reference for the maximum fps at full resolution - I have not found anything other than 30fps. And while I am feeling lazy, would you mind listing the hard drives that can write at >100MBps sustained - though I don't think it really matters, since you can just use 10-15 slower disks and handwave the rest.
Now that you have a 10lb camera (no lens) and a large pile of hard disks - who do you expect to use this in situations calling for a dslr?
Sorry, can't find a reference to the RAW fps numbers that the camera puts out, but it's what was mentioned when news about RedOne came out.
Disk-wise, a single Seagate Cheetah 15K.5 146GB will push, depending on controller, a sustained sequential throughput of at least 80 MB/sec, up to 120+ MB/sec, on SAS link. 4 WD Raptors in RAID 0 will hit sustained data transfer rates, for sequential operations, of more than 200 MB/sec.
Disk-wise, a single Seagate Cheetah 15K.5 146GB will push, depending on controller, a sustained sequential throughput of at least 80 MB/sec, up to 120+ MB/sec, on SAS link. 4 WD Raptors in RAID 0 will hit sustained data transfer rates, for sequential operations, of more than 200 MB/sec.
Thanks for the pointer - the only spec I found on their website was 30fps at full resolution, 72fps at 2k.
I am not sure the tweakers.net tests are relevant to large transfers - the description of the write test seems to talk about burst writing more than sustained (max of 32MB per test), but I am sure that if you get enough disks and high performance controller, you can stream 500MB/s. I will still claim that this is very different from a dlsr.
I am not sure the tweakers.net tests are relevant to large transfers - the description of the write test seems to talk about burst writing more than sustained (max of 32MB per test), but I am sure that if you get enough disks and high performance controller, you can stream 500MB/s. I will still claim that this is very different from a dlsr.
The ATTO benchmark numbers are for max 32 MB, so that will partially test HD cache and/or controller cache. However, the Winbench99 and IOmeter numbers get closer to sustained transfer rates. (And you'll find that transfer rates of more than 600 MB/sec are possible with just 6 HDs.)
