I don't see anyone using those new 4TB drives in anything bigger than a 2-drive config. They don't have the performance or reputation to justify their use just yet.
Pricing on the Promise units going up wasn't entirely their fault, it coincided with the HDD makers ramping up prices and citing the flooding in Thailand as an excuse. B&H has the 12TB R6 for $2145 w/ free shipping right now and that's the best deal I know of out there. Unfortunately, It's still about $225 more than what I paid for mine when they were first released....
I have a R6 12TB. There tech people told me 2 R4s in raid 0 would be faster then 1 R6. So I got 2 and they were wrong did not work any faster then just one.
They did get me to some one better I hope. He told me if I did all SSDs it would be faster and that would not void the warranty on the unit.
I did ask about 3TB & 4TB they told me it would work buy I would not do it any way. I will stick to enterprise HDDS from hitachi or seagate enterprise.
Now hitachi is a Western Digital company hope they don't mess it up.
Trying seagate's thunderbolt desk top dock seems nice. I used 2 3TB raid 0 in disk utility and it more then doubled the speed vs just one.
Same idea and way LaCie does it with the Little Big Disk. Chain them together, the higher performance you get.
Now I am looking at 6G SAS Expander.
there are 4bay 8bay and big 16bay.
An idea would be when you don't need to be mobile use a 16 or more bay and use a express thunderbolt pcie expansion chassis with a SAS card.
For a iMac or macbook pro.
In less the mac pro is up dated and can really out do a iMac.
Still SAS can do more then thunderbolt.
They seem to be using 4TB drives in the OWC raids now. For a while only the 5400rpm. Now all 7200rpm though.
I think another factor in this is the SSD market. SSD storage is placing increased pressure on HDD makers and the only two factors that HDD makers have in their favor at this point is the pricing and capacity. They're about to lose the capacity advantage within the next 12 to 18 months, so it seems they're going to push the prices up while they can. As long as SSDs are still 3 to 5 X more expensive per GB, they can still pretend HDDs are a bargain. People are fickle and will soon forget that a 1TB HDD used to be $55.
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