4,1 PCIe storage & scratch (RAM) disks

mattspace

macrumors 65816
Original poster
Jun 5, 2013
1,221
942
Australia
Hi Folks,

So I want to get my system, apps and scratch disk space off spinning disks and was wondering what people's opinions are of the best way to manage it.

I can fit my current system, apps and user directory on a 256GB Samsung XP941 with about 40GB to spare - though I'm not sure how PCIe storage handles being accessed by multiple processes at once, for instance simultaneous file I/O and scratch use.

It just occurred to me that I could try to use a RAM disk as scratch space for when I'm doing highly scratch intensive tasks. Anyone had experience with that?
 

thefredelement

macrumors 65816
Apr 10, 2012
1,142
558
New York
Hi Folks,

So I want to get my system, apps and scratch disk space off spinning disks and was wondering what people's opinions are of the best way to manage it.

I can fit my current system, apps and user directory on a 256GB Samsung XP941 with about 40GB to spare - though I'm not sure how PCIe storage handles being accessed by multiple processes at once, for instance simultaneous file I/O and scratch use.

It just occurred to me that I could try to use a RAM disk as scratch space for when I'm doing highly scratch intensive tasks. Anyone had experience with that?
You can get two PCIe adapters, or a ton a of RAM, or all three.

I have two Samsung 256GB in a Raid 0 on a Sonnet Tempo Pro and 48GB of RAM in a 4,1 and that works for me. I have a 64GB SSD in a sled (on Sata2) that I keep telling myself I'll add to another PCIe card but the need hasn't presented itself as of yet.

Either way, put your main SSD on a PCI adapter for Sata3 speeds, it's a much faster experience.
 

IowaLynn

macrumors 65816
Feb 22, 2015
1,301
287
Hi Folks,

So I want to get my system, apps and scratch disk space off spinning disks and was wondering what people's opinions are of the best way to manage it.

I can fit my current system, apps and user directory on a 256GB Samsung XP941 with about 40GB to spare - though I'm not sure how PCIe storage handles being accessed by multiple processes at once, for instance simultaneous file I/O and scratch use.

It just occurred to me that I could try to use a RAM disk as scratch space for when I'm doing highly scratch intensive tasks. Anyone had experience with that?
Firstly I would leave only ~/Library on your XP941 and assume photoshop plugins will want to use 100GB of the boot drive, and my own 'rule of thumb' is to aim for 50% free on SSD and hdd.

I would first upgrade RAM to whatever you can afford, dual or single? 6x16GB or not.

Use XP941 for scratch or system, or both if you go for the $500 500GB or go to ebay and land an Apple unit (500, 768 or 1TB)
 

mattspace

macrumors 65816
Original poster
Jun 5, 2013
1,221
942
Australia
I'm curious as to how putting ~/Library only on the SSD is done - with an alias in the user directory on the spinning disk? Does time machine automatically track through to that?

Would setting the SSD and the stock 7200rpm hitachi drive as a Fusion drive be a reasonable solution, or do you really see performance degrade if the SSD starts to fill up?