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Forum Discussion
request: Capacity Calculator
I'e been doing searches about how to calculate capacity for my readyNAS and I think I understand it, but it's not nearly as much fun as:
http://www.drobo.com/calculator/4-bay/index.php
Just look at how cool that little drag and drop interface is that lets you setup your disk storage like you have it, and then play with swapping in and out various combo's of HDD to see what sort of capacity increase you'd actually get.
Any chance of getting something like that for ReadyNAS?
I'd appreciate if you did it for a 6-bay ReadyNAS Pioneer Pro running XRAID2 first. :)
-Mark
http://www.drobo.com/calculator/4-bay/index.php
Just look at how cool that little drag and drop interface is that lets you setup your disk storage like you have it, and then play with swapping in and out various combo's of HDD to see what sort of capacity increase you'd actually get.
Any chance of getting something like that for ReadyNAS?
I'd appreciate if you did it for a 6-bay ReadyNAS Pioneer Pro running XRAID2 first. :)
-Mark
4 Replies
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- Actually in your case with 6x2TB it's real easy. If you are in single redundancy, it's 5x2x.93 or 9.3TB. If it is dual redundancy it's 4x2x.93 or 7.4.
- That example is straightforward, but what about if I have 4 x 1.5TB drives and 2 x 3TB drives? or 3 and 3? The problem I have is I'm guessing how many drives I need to buy and what capacity, without knowing how it will affect the available capacity.
- It's still easy. If you have single redundancy, you remove one of the largest drives. So in the case 4x1.5TB drives and 2x3TB drives, it is 4x1.5x.93=5.6TB and 1x3TBx.93=2.8TB which equals 8.4TB. If you were 3 and 3, it would be 3x1.5TBx.93=4.2TB plus 2x3TBx.93=5.6TB for a total of 9.8TB. In the case of Dual redundancy you must have 4 of the larger drives for the second layer to come in, so in the either 4x1.5TB and 2x3TB or 3 and 3 you would have 4x1.5TBx.93=5.6TB.
Incidentally, the link above no longer works. I just put the numbers in Excel and let it do the calculation. Just remember to take out the 1 or 2 largest drives.
Have you watched this? http://www.readynas.com/?cat=53 - Ahh, thanks. I have seen that animation, but it wasn't clear how it was being calculated. The "Get rid of the largest drive (or 2 for dual drive redundancy)" is a GREAT thing to know regarding the XRAID2. That should be on an FAQ somewhere.
Not that I didn't trust you, but I wanted to see what would happen, so I factory reset my Pro 6, stuck in 4x 1.5TB drives and 2x 2TB drives to see what happened. I was a little nervous at first while it was syncing, because the same amount of space was allocated on the 2TB drive as on the 1.5TB drive (and the volume size was 6926GB), but as soon as the sync finished, it found new space and expanded the volume to 7389GB.
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