Resolved Expand JBOD?

Discussion in 'OS X Mountain Lion (10.8)' started by AT0MAC, Nov 7, 2012.

  1. AT0MAC, Nov 7, 2012
    Last edited: Nov 11, 2012

    AT0MAC macrumors regular

    AT0MAC

    Joined:
    Jun 4, 2011
    Location:
    Copenhagen, Denmark
    #1
    I am currently building a server that is going to run Mountain Lion. I am practically done building but before I start installing software I want to know one thing:

    Can I expand my 5TB JBOD later without loosing any data?

    I don't need more space now, but if I cant add later I better buy the last disc before I complete the build.
     
  2. EmpyreanUK macrumors regular

    Joined:
    Mar 6, 2011
    #2
    It's just a bunch of discs, so adding an additional unit will simply provide you with another disc. It won't have any effect whatsoever on the other discs.

    Disc.
     
  3. AT0MAC thread starter macrumors regular

    AT0MAC

    Joined:
    Jun 4, 2011
    Location:
    Copenhagen, Denmark
    #3
    Anyone can confirm this?
     
  4. prisstratton, Nov 8, 2012
    Last edited: Nov 8, 2012

    prisstratton macrumors 6502

    prisstratton

    Joined:
    Dec 20, 2011
    Location:
    Winnipeg
    #4
    I just tested this on Snow Leopard:

    Edit: Same result in Mountain Lion
     

    Attached Files:

  5. AT0MAC thread starter macrumors regular

    AT0MAC

    Joined:
    Jun 4, 2011
    Location:
    Copenhagen, Denmark
    #5
    Super Duper! :cool:

    You just saved me money for now, as I can wait with adding a third drive till the need arises. Also, thank you guys here on MR for getting straight to the point and answering, awesome forum ethics!
    (tried the exact same question on two other sites and never got a useful answer any of those places)
     
  6. sidewinder, Nov 9, 2012
    Last edited: Nov 9, 2012

    sidewinder macrumors 68020

    sidewinder

    Joined:
    Dec 10, 2008
    Location:
    Northern California
    #6
    You have to be crazy to use a JBOD configuration on a server......it's not reliable and there is no redundancy.

    Scott
     
  7. Kasalic macrumors regular

    Joined:
    Jan 20, 2011
    #7
    What Scott said is absolutely correct, lots of people confuse JBOD with concatenated Raid.

    Mac OS uses Concatenated Raid and not JBOD. yes you can add disks to the system and increase space as above, however if one drive fails you will lose the lot.

    Read http://en.wikipedia.org/wiki/Non-RAID_drive_architectures for more information.
     
  8. sidewinder macrumors 68020

    sidewinder

    Joined:
    Dec 10, 2008
    Location:
    Northern California
    #8
    I was talking about it i reference to how Apple refers to it. Concatenated Raid is crazy to use on a server.....

    Scott
     
  9. AT0MAC thread starter macrumors regular

    AT0MAC

    Joined:
    Jun 4, 2011
    Location:
    Copenhagen, Denmark
    #9
    OK, I see your point... That's why I am changing my meaning and is willing to pump more money into this beast (started out as I wanted to build an inexpensive home server, that goal has loooong past now I just want to build the best).

    See my new thread about RAID10
     
  10. Richdmoore macrumors 68000

    Richdmoore

    Joined:
    Jul 24, 2007
    Location:
    Troutdale, OR
    #10
    Hello, I was thinking about doing this as well (for an iTunes library of mostly movie rips.). Backups should not be an issue because I always make a copy of the movie to another offline backup drive as soon as handbrake finished converting the movie.

    My question is if both USB & firewire drives can be added to a Concatenated set of drives (JBOD is the common name, right?) or if all the drives have to be the same interface (firewire 800 or USB).

    Thanks in advance for any help.
     

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