Originally Posted by assassin
What? What is a "Super big drive?" Is that what 2TB were a few years ago? Or 3TB last year?
Please post references or proof of this (I know you have none as usual)
This is just poor advice based on absolutely nothing but your own bias. Again, its a bunch of FUD.
Even if it takes 2 Days
) longer so what? That is 2/1825.
It's basic math. I am not sure why you don't get the point.
You pick the independent review site benchmark and the model 4TB you suggest if you disagree with my numbers. I'll be happy to re-do this. Otherwise here is my best guestimate
3TB 7200rpm average read/write 160MB/sec
4TB 5200rpm/5900rpm read/write 130MB/sec
4TB = 4194304 MB
3TB = 3145728 MB
4194304 divided by 130MB/sec = 32264 divided by 60 = 538 divided by 60 = 8.9 hours (this assumed a full speed average read of 130MB sec over entire 4TB which is somewhat optimistic IMO and unlikely - I believe real world would see at least an extra hour but I am trying to be conservative )
that's basically 9 hours theoretical (again probably 10+ hours real world , and I'd expect a full 4TB to take 12+ actually in many cases)
3145728 divided by 160MB/sec = 19660 divided by 60 = 327 minutes divided by 60 = 5.46 hours. (again this is theoretical and you could expect this to take an additional couple hours if not ideal real world scenario)
5 hours 45minutes means that if you start at 2am like you claim you are done at 7:45AM (this is what I do basically, but I start it at 1am, and sometimes mine is going around 8am in the morning and have 3TB drives which is why I say add some time real world)
If you started at 2am and it took 9/10/11/12++++ hours you are well into the next afternoon or evening.
I used pretty fast HDD speeds in my theoretical scenario so it's likely a person's real world results could be less ideal, which makes my case stronger- and yours weaker IMO.
As for the comment about additional stress- that is potentially extra hours of time all of your hard drives are running at full speed. Not just one hard drive, but every hard drive. Not just for a brief moment- but for hours and hours. That's more electricity, heat and noise. If you don't consider this stressful for your system I don't know what else would be considered stressful. All of your hard drives running at full speed at the same time for hours is very stressful IMO.
There is nothing wrong with using a 4TB drive, and if you are limited in drive bays or HDD space that is likely a worthy trade off you make for the extra capacity. My only point was bigger might not always be better. I have long comtemplated upgrading my parity and adding some 4TB drives but I still have not found deals on the 4TB as good as the 3TB drives, and when I factor in the extra time of a bigger drive it just does not seem worth it to me. Then again, I have a 20 bay case so I am not limited. Each person's own choice is unique and I am not saying it's wrong to choose 4TB drives, it makes sense if you need them. I was just offering my opinion, as it seems the automatically rally to 4TB drives these days does not consider some of the things I have found to be true from personal experience with software raid like FLexraid.
I think flexraid is better with more smaller drives. It just cuts down on the time to do everything. Just imagine swapping out a 4TB drive that failed. That's going to take a LONG TIME.
It's just my opinion and advice. Do with it as you wish. I never intended it to be anything more than that, but please don't accuse me of lacking data or facts. I'd love to see your data or facts from your perspective. I provided sufficient explanation of my feelings and why. I don't care how you manipulate the data you can't change the fact that 1TB more at a slower speed is going to take longer. It's beyond common sense.