anyone ever heard of a drobo ?

Discussion in 'OT Technology' started by dorkultra, May 3, 2007.

  1. dorkultra

    dorkultra OT's resident crohns dude OT Supporter

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  2. mdaniel

    mdaniel S is for Shiksa

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    Sounds interesting. Too bad about the USB2.0 interface. Hopefully future versions will have eSATA, GigE, or FW800 support. $700 is pretty pricey too.
     
  3. deusexaethera

    deusexaethera OT Supporter

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    Looks like a run-of-the-mill external RAID array with better-than-average marketing.

    If I were going to get an external RAID array, it would pretty much have to be SCSI to get any useful speed out of it.
     
  4. TheDarkHorizon

    TheDarkHorizon \xC0\xFF\xEE

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    They claim that their technology is not using RAID. It's also using USB 2.0, so they aren't built for speed.
     
  5. P07r0457

    P07r0457 New Member

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    looks like a fault-tolerant JBOD array. I think it's neat.
     
  6. deusexaethera

    deusexaethera OT Supporter

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    It uses RAID, or at least Spanning + Parity, which is itself a type of RAID where the stripe is as "wide" as the smallest drive in the set. That's the only way it can work the way it does. I say this based both on experience with devices like this as well as on the results that the Disk Space Calculator on their website generates.
     
  7. P07r0457

    P07r0457 New Member

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    it's not very efficient. With 160G, 80G, 250G and 1T drives (1490G) it will give you only 454G. That is a shitty 30% efficiency. No thanks.

    Even with matching drives 4x1T (4T) you only get 2.7T which is a still not-so-hot 67%.

    RAID 3/5 both give 75% in the same situation. As you increase drives in a RAID 3/5 array it only goes up to 87% for an 8-drive array.
     
  8. deusexaethera

    deusexaethera OT Supporter

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    That would be the fundamental problem with calculating parity on a mismatched disk set. Did you notice that what they call "Overhead" is really "Unusable Space"? The parity overhead is added on top of that; only the blue bar is actually usable.
     
  9. P07r0457

    P07r0457 New Member

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    yea. I think it's excellent marketing. But overall, not very practical. If you need a USB disk, get a traditional USB disk. If you need redundant and upgradable storage, build a file server.
     
  10. deusexaethera

    deusexaethera OT Supporter

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    It MIGHT be useful if you plugged in a matched disk set, which is better anyway because it makes it easier to buy spares, but the USB-only thing really is a deal breaker for anyone who actually needs to store that much data.
     
  11. P07r0457

    P07r0457 New Member

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    even with matched disks it's still only 67% efficient. And the cost of the unit is high. You could get a great internal controller for those prices! Heck, you could build a basic machine for that cost and run software RAID, lol.
     
  12. deusexaethera

    deusexaethera OT Supporter

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    Only 67% on a matched set? I didn't notice that before; that's almost like...wait a minute, does the array maintain a hotspare?
     
  13. P07r0457

    P07r0457 New Member

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  14. deusexaethera

    deusexaethera OT Supporter

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    :dunno: They're either doing something special, or something wrong, then.
     

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