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I need to make a 50TB RAID array.
Now I'm confused!
I didn't found any RAID controller that have more than 8 channels (So supports 8 drives (?)).
So how can I make an array of 25x2TB drives?
Do I need more than one controller?

Where is my mistake?


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Someone told you to build a 50TB storage solution and you have no idea how that could even work? Who are you working for? – Oliver Salzburg Jun 11 '12 at 22:00
@OliverSalzburg: No! I need it for my own! And I want to to do it by myself! – RYN Jun 12 '12 at 5:46

The number of channels available on the RAID card does not automatically equal the number of drives.

On SATA-1, you need as many channels as you have drives, while SATA-2 lets you make use of hubs to expand in principle (but as total bandwidth is limited this slows things down, and it's not supported very widely).

If you're on SAS -- serial attached SCSI -- which can still let you use SATA drives (check out Near Line SAS, which is slower than SAS but gives you the scale of SATA, see, you can put up to 128 drives off a single HBA (host bus adaptor, the card you plug them into): -- or up to 65,535 through expanders!

All that said -- if I were you I'd have a chat with the major vendors (say, Dell or IBM), and see what they have to say. That's some fairly expensive hardware...

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Look at this for an example to how to build a large storage array - they've used port multiplier backplanes with pcie cards for a total of 135 terabytes on 45 driveson a custom case.

On the other hand, if you're actually asking about what to do.. Most of the big vendors sell devices like this - you're looking for a storage array, SAN or NAS - wikipedia would be a good start in learning the differences between them. Do your homework, work out what you need, and just buy one with a good support contract.

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