Andrew Weinstein
Forum Replies Created
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Thanks…upgrade it is.
Andrew
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Thank you. So, when empty the 3 HD RAID gets 300 megs/sec and when about 60% full you are getting 225-250. Not bad at all. Certainly good enough for capturing and editing uncompressed HD I assume.
Again, thx for the follow up.
Andrew
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Thank you.
That would be wonderful, thank you.
I’m out of the country starting tomorrow for the next 2 weeks anyway (Costa Rica here I come!!) so no rush on this end. i would be interested to know though, since that is the usual state of my RAID.
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Thanks for the info.
How much of a hit does the throughput take when the RAID is half to 2/3 full?
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If it helps, i ran the AJA system test and read/write were both about 137 megs/sec on the 1/3 full RAID.
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I simply meant, have you tried turning the cam off AFTER “ejecting” the Canon icon on the desktop?
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I don’t have public videos but if you send me your e-mail address I can send you a snippet of some 1920×1080 green screened footage. I’m not with my Mac Pro right now. I don’t really remember the name of the backup software but it was something generic. It was either free or nearly so. I back up daily but if I were doing this every day (I don’t) I’d back up more often.
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“when you say no raid card and just stipe the drives in a raid 0. can i do that without a raid card?”
Yes. The Mac OS will let you set up a RAID, software only. Nothing additional to buy/install.“if i have 3 1TB hard drives setup in a raid where do i back up my data to if one fails?”
Same place you would back up to if it were simply a single drive. For $500 you can get an external 2 TB external RAID 0 and back up to this.“where do i keep my OS and software? ”
On the System drive, which is separate and apart from your RAID setup. So, if you are going to have a 3 drive RAID, you would need 4 drives altogether; 1 for the OS/software/etc and 3 for the RAID. Then of course the external drives for backup are additional.“i can afford raid 5 since i will be buying all my harddrives from a third party. as long as you feel mac pro raid card is good i will get that unless you have a third party recomendation. ”
I don’t use the Mac Pro RAID card since the software RAID setup is more than fast enough for my needs. At $800, it is not a cheap addition. My Mac Pro has room for 4 HD. One for the system leaves 3 for a RAID. If you set it up to be both fast and redundant (RAID 5) it will leave you with only about 1.3 TB capture space, assuming these are 3 1TB drives. I think it is better to back up to external drives and set up the internal drives as RAID 0. 3 1TB drives as a RAID 0 will give you about 2.7 TB of storage. Keep in mind that uncompressed HD is something along the lines of 119 megs/sec. The intensity card has an option to do a compressed form that is 12 megs/sec. But if one is going to choose that, it seems to me you’re better off shooting in AVCHD and transferring to the computer as Pro Res format (which is a full 1920×1080).“should i record my video onto the camera then use the HDMI to record it from the tape in case i have to film off location? i mean while in office i can have my pc setup next to the camera and can record straight onto my PC through HDMI.”
If you want to get full uncompressed HD you must capture while shooting it. You are thus tethered to the computer. If you record to the camera first and then transfer, the data has already been compressed. I don’t work in full uncompressed HD. I shoot. When done I remove the 16 gig SDHC card, plug it into a card reader, open up Final Cut Pro and “log and transfer”. It is converted from AVCHD to Apple Pro Res format which I edit in. With a dual quad core machine it does this in real time (a ten minute recording takes 10 minutes to transfer to the computer). When done you can out put it to whatever you would like. -
Have you tried “ejecting” the camera after log and transfer?
I have the HF100 so I just use a card reader with the memory card but you have to “eject” the canon icon on the desk before removing the card. -
I would agree with all of Andrew Yoole’s comments. Just a couple of additions/nits.
“Get a low-end HDV camera with true uncompressed HDMI output. The Canon HV20 is a perfect example. This will give you native uncompressed 1920×1080 output from the HDMI port, which is the BEST way to achieve quality keying.”
True, BUT the files of uncompressed HDMI are humongous. The file size from the HF100 (AVCHD) is a small fraction of the size. It is not a great low light camcorder and if you are shooting alot of action with quick moving things, it is subject to slightly more artifacts. But if you are shooting greenscreen of talking heads with good lighting (needed anyway for a decent key anyway) the results are outstanding with the HF100 and the file sizes are miniscule compared to uncompressed HDMI. You always have the option of doing a live feed of uncompressed HDMI from the HF100 using the Black Magic Intensity card if you decide the quality from AVCHD (which FCP converts to Pro Res) is not sufficient. When transferring AVCHD to the computer there is NEVER an issue of a dropped frame, as it is being transferred, not captured. But he is right. Uncompressed HD from HDMI feed is the highest quality option (though done right, the difference with well lit AVCHD is not visible unless you do some serious pixel peeping).“CHEAP choice: No Apple RAID card. Just install the three new drives and stripe them as RAID 0. Con: No data protection if one of the drives fails. ”
This is how I do it, though I set up a RAID with 2 drives, not 3. The Mac OS has a very simple approach to setting up a RAID with internal drives. Just make sure all the drives for the RAID are identical. I had zero experience setting up an internal RAID and it just took a couple of mouse clicks. Cost is 0. I cannot emphasize enough how simple it is to do. While not quite as robust as using a card it is more than fast enough for all but uncompressed HD (actually, I’ve never worked with uncompressed HD in any meaningful way so I don’t really know from first hand experience whether or not the software RAID is sufficient for this).