I know I cannot mess around with Mr. frog when the topic is about speed and drives.
The strip size is at 128K block size, NCQ enable, Read ahead cache on, write cache disable. RAID card memory, 256.<<<If I can change it to 512 or 1G, it will make huge difference. RAID card 800MHz IOP348 <<< Areca has 1.2GHz version which I have not get a chance to test it yet.
1. You could try setting the stripe to 256K (it doesn't seem to be worth going larger IMO)
2. Disable NCQ
3. Enable Write Cache, which can be done in the browser window, but it also needs to be set as write through, which is set in the card's firmware
Test it out and see what happens. You can play with the NCQ setting, as sometimes it can help a little, but be careful, as it can also cause instability, particularly on the SAS models. (You need to understand how the card behaves anyway, including simulating various failures, like pull the power cord (assuming it's attached to a UPS), and pull a drive and see how it reacts (degraded mode, rebuilds,...). If you're unsure of the details of your useage pattern (types and frequency of file transfers), nows the time to find out.
I like the Areca card over High Point because the tech support from High Point is a nightmare. Even for the testing cards that I got from them were not updated and their firmware update requires a pure dos boot up environment.
I believe many of you had the same experience that a pure PC mentality company wants to do Mac business and never study what we really needs and I truly believe they don't even have a Mac in their testing lab.
Highpoint also has the issue you can only have EFI or BIOS in it, not both. So OS boot capability is affected by this. Unfortunately, most firmware updates are still done on the PC side (DOS), as it's been around, and it does work. But they assume user's have access to a DOS boot disk, and this can be a problem for Mac users who don't run windows or have access to a windows machine/friend who's willing to make one for them.
To get a 4.5TB with 1.5TB.. That means you have to get Seagate.. Ask Mr. Frog see if he suggest using seagate, he will say NO!!!
MY suggestion is getting a Areca 1221X card with Stardom Decktank DT-8 $695
http://eshop.macsales.com/item/Raidon/ST8S2P/
and get the 2314 $195
http://eshop.macsales.com/item/Highpoint Technologies/RR2314/
1TB $84
http://eshop.macsales.com/item/Hitachi/0A38016/
Total $1562
A 8TB with RAID 5 for $1562, i cannot complain.
There are alternative solutions but I trust OWC.
1. I don't like what happened over the 7200.11 models, particularly the 1.5TB model.
It was a disaster.
So I don't trust those.
Others may not be an issue though (Samsung), but research is warranted.
The ARC-1221X may work, so long as you don't need to boot from it (driver support only for Mac). If a PM's limitations are acceptable, that's not a bad setup, though there are other enclosures that are really good, but a bit less money. An
Enhance E8 PM unit should be ~$100 - 150USD less. Others as well, that work well, and actually look decent too.
Otherwise, another card and enclosre (port connections) would be needed (greater throughput potential).