RAID10 for HDDs in 2 different places - doable?

SmOg3R

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Jul 27, 2013
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Hello all,

okay so I have a project from my virtualization class. One part of it is figuring out how to set up big capacity storage so that it can be both secure and easily accesible (NAS).

I was thinking, is it possible to use RAID10, take odd numbered HDDs disk1, disk3, disk5... and place them in one room, while keeping all the other HDDs in different place?

The idea of course is to have same data in both places, so that if small fire incident (or smth) in one of these rooms occurs, the data won't be lost (as odd numbered disks mirror even numbered ones). The rooms could be some 200-300m away from each other I guess: I imagine FTP 1gigabit cat6 cable. But then again, can it be all hooked up for raid10 like this?

PS. Again, it's a presentation, not a real life thing, so don't worry about the price and similair stuff too much.
 

4745454b

Titan
Moderator
Interesting idea you have but I don't think it would work out very well.

How large are we talking about? When I first read it I was thinking of physically secure while your thinking more like backing up. I guess both could be correct. I would assume the answer would lay with implementing RAID 5 or 6, with a real time backup done over LAN/WAN.
 

SmOg3R

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Jul 27, 2013
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Why won't? Are you sure? Please be more specific.

As for the raid5/6, for my idea they obviously won't work as it would be impossible to seperate the same data.

PS. someone asked the numbers, we are talking here about 3TBx120 (180TB "usable" space).
 

4745454b

Titan
Moderator
It won't work the way you described it because you can't get the drive cables that long. From the board/controller to a building meters away for only half the drives? "My" way would work much better. RAID5 or 6 the drives with a real time backup that happens over the network. A second copy that is away from the original data in the event of fire, etc. RAID5/6 for real time replacement. Fits the requirements with nothing special needed.
 
There are data replication systems that do what you're wanting(synchronizing data across great distances). These basically take a drive (or SAN, NAS) in one building, and replicates it to a drive in another building(at a DR site). If anything happens at the primary site, you just fail-over to systems at the DR site. The replication can be real-time depending on how much bandwidth there is between the sites. This
 

TyrOd

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Aug 16, 2013
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You want to put one hundred and twenty 3Tb drives in a SINGLE RAID 10 array?
Lolwut

Besides the fact that an array of disks has to be physically connected to the same controller hardware or multi-controller system, you would need specialized FCoE/iSCSI SAN architecture with multiple RAID sets for that many drives of that capacity.
There are a huge number of factors to consider in a system like that and you're going to need help from the SAN manufacturer/system integrator(Equalogic/Compellant, VnXe, etc...)
 

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