Setting internal soft RAID as scratch disc in FCP

I have an internal 1tb RAID I use as a scratch disc for Photoshop. I want to use it for FCP. I know when I go back to PS it won't be optimal but I have a couple of shorts clips I wanted to edit and figured I could use the 1tb as a scratch. It is made up of two 1tb Samsung F1's using Disc Utility to make them a Striped RAID 0 Set.
When I go to choose a scratch drive in FCP it doesn't show the RAID as an option.
What am I doing wrong?
thanks
r

rcdurston wrote:
What am I doing wrong?
Hi(Bonjour)!
You ask on the wrong forum... try:
http://discussions.apple.com/forum.jspa?forumID=939
Michel Boissonneault

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How to determine the scratch disc size?

hello,
once i was reading an adobe pdf "How to get better performance in photoshop cs5" - that was in 2009 or 2010, and may be outdated, but there was a calculation method
to determine the size of a scratch disc. (similar calculation see below, if i can remember right)
i am asking myself, how can i determine the correct size of an external SSD-scratch disc, only used by photoshop (completely empty):
should i buy a 128GB or 256GB or 512GB SSD which is only reserved for photoshop?
basic question 1 : i guess i should avoid to set the internal SSD as photoshop scratch disc, as it slows down everything?
basic question 2 : in sense of maximum performance: better buy an external USB3.0 or thunderbolt SSD? will photoshop really use the extra thunderbolt speed when swapping data?
secondary question:
can i calculate the size regarding my daily working habits?
i am mainly working like this:
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- OSX 10.8 mountain lion and 10.9 mavericks soon
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- 8bit and 16bit mode
- only RGB
- with latest phocus/Hasselblad and canon RAW Files which produce a basic .psb document at ...
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- .psb file is 2-20 GB big (file in finder)
- 16bit file compression is off, when saving .psb files (faster handling)
- set photoshop to 70% ram usage (from 32GB RAM)
i wonder how to calculate ?
for example:
10.000 x 7000 px at 300dpi needs for one image layer at 16bit: 2GB RAM in photoshop cs6 or cc (just as a number), this may be wrong
so lets take 2GB RAM and multiply with 10 image layers in my .psb file (16bit) = 20 GB RAM, and multiply with 20 adjustment layers (guess they need less ram, for one lets say 500MB) = 20GB + 10GB = this 16bit .psb layer file would need 30GB RAM, so when i have 32GB in my imac, i set cs6 or cc to 70% ram usage, it misses at least round 8-10GB RAM > can i guess that photoshop would swap these 8GB onto my scratch disc? or do i miss something important in my thinking?
tricky thinking
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station_two wrote:
The rule of thumb I follow says to figure on 50 to 100 times the size of your largest file ever multiplied by the number of files you have open. I have seen the scratch file exceed 300 GB once, an admittedly rare occurrence, but it often exceeds 200 GB when stitching large panoramas and the like.
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Additionally, if you only have a single HD, i.e. your boot drive, you'd need it to be large enough to accommodate both the swap files of the OS as well as Photoshop's scratch.
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- if you say "50 to 100 times the size of your largest file ever multiplied by the number of files you have open.":
i will not open more than one document at same time to prevent performance lags, so lets calc like: dokument size in finder (you mean in finder or doc. size shown in photoshop?) = e.g. 5GB x 100 = 500GB, so my external scratch disc SSD, i would buy now, should be at least 500GB, USB 3.0 or thunderbolt ... maybe better thunderbolt, yes? with usb 3.0 i could gain 300MB/sec if thats enough for photoshop?
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http://dl.getdropbox.com/u/19589/Sample%20File%20Structure.png
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{quote:title=In my Mac Pro do I need an E-Sata Controller card like one from Sonet with 4 ports in order to achieve a raid configuration and speed?}{quote}
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{quote:title=With out a controller card, stripping 2 drives, does Leopard sees the 2 drives as one large drive without the speed? }{quote}
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Hi,
I just noticed that I set my scratch disc in (on?) the internal drive, but I prefer to have it on an external. I'm in the middle of editing a project now, will it cause confusion to FCE HD if I change the location of the scratch disc?
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No.
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asking the adobe team photoshop engineers, if there is one?
which kind of scratch disc are you using? i think you must know it
i would like to know whether the difference of usb3.0 to thunderbolt is marginally or not?
reading that there is a difference between using the boot disc as scratch disc and using a dedicated separate disc,
i think using the boot disc as scratch is not a good decision, as it is used by the system already, although it would be very fast (700MB/s)
i am professionally working with photoshop cs6 under medium to high demands:
16bit .psb layer files, document size 20x40inch, 300dpi, RGB - my average filesize is 10 - 20 GB per .psb layer file.
currently using an external usb3 500GB SSD (crucial m500) as a photoshop cs6 scratch disc,
under 10.9.1, in the moment i am using an imac 27" late 2013 with internal PCI-e SSD (700MB/sec)
and 32GB RAM. my info panel says, that 32GB RAM is not enough and the scratch disc is active, (50GB is needed, 32GB is available)
calculating scratch disc size: 20 x 100 = 200GB as needed to scratch, the 500GB SSD is a lot more than i need, actually?
in mid 2014 i want to buy the new mac pro with 64GB RAM, also would need a dedicated scratch disc,
as i heard that photoshop is constantly using the scratch disc, also, if it doesnt need it.
it writes the whole image onto the disc, when opened.
my concern is:
USB 3.0 is not built as a pure data connection (as thunderbolt is), it has a weak read/write sustained throughput, as i heard.
as conclusion: must i use an external thunderbolt SSD as photoshop scratch disc to prevent lag and performance drops compared to usb 3.0 or is the difference marginally?
thanks!

For optimal performance in Adobe Camera Raw and Photoshop CS5 (I will soon upgrade to CS6 or CC), how should I distribute my OS, apps, Scratch, Caches, DNGs, and working TIFFs among these drives?:
120 GB OWC Mercury Extreme Pro 6G SSD
240 GB OWC Mercury Extreme Pro 6G SSD
960 GB OWC Mercury Accelsior SSD
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The Accelsior SSD, connected by TB1, is by far the fastest drive. Would partitioning and devoting different parts of it to different functions help?
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Hardware Overview:
Model Name:   iMac
Model Identifier:   iMac12,2
Processor Name:   Intel Core i7
Processor Speed:   3.4 GHz
Number of Processors:   1
Total Number of Cores:   4
L2 Cache (per Core):   256 KB
L3 Cache:   8 MB
Memory:   32 GB
Boot ROM Version:   IM121.0047.B1F
SMC Version (system):   1.72f2
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Advice on setting up a RAID

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Setting internal soft RAID as scratch disc in FCP

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