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Forum Discussion

DavidKino's avatar
DavidKino
Aspirant
Jul 01, 2016
Solved

ReadyNAS 204 one disk's space is not shown

I have bought a new ReadyNAS204 and 2 SATA 3TB disks. The disks could be found in admin page but the space is not correct. It's now 1.59TB free of 2.72TB. It seems lost the other 3TB.

 

Any suggestion? Thanks!

Feature Request & Feedback
  • StephenB's avatar
    StephenB
    Jul 05, 2016
    Leia wrote:

    But there's no data redundancy for RAID 0. So if one of your drive got failed, all your data would be lost.

     

    I want to emphasize that when either drive fails you lose all the data on both drives.  You can also create two volumes (one for each drive) which is a lot safer.

    Leia wrote:

    Actually if you get one more 3TB drive(must be 3TB at least), and still on XRAID mode, hot-insert the new 3TB drive into your box, you would have a 6TB RAID 5 volume then. RAID 5 volume also has redundancy.    

    This is generally the best configuration for most users.  Fot the extra ~$100 US you get the ability to recover from single disk failures with no need to restore files, and also have the ability to expand the array with no need to restore files from backup.

     

    You will still need a backup though, as RAID alone is not enough to keep your data safe.

     

     

8 Replies

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  • omicron_persei8's avatar
    omicron_persei8
    Luminary
    Jul 01, 2016
    By default, the ReadyNAS builds a RAID1 on the two HDDs. That's the capacity of one gone (for redundancy).
    Then 3TB minus a few GB for OS and swap, minus conversion from TB to TiB, and you get from 3TB advertised by manufacturer to 2.72TB displayed (TiB).
    • DavidKino's avatar
      DavidKino
      Aspirant
      Jul 04, 2016

      Thanks!

      And is it possible for me the remove the RAID1 and use the whole capacity?

      • BrianL2's avatar
        BrianL2
        NETGEAR Employee Retired
        Jul 05, 2016

        Hi DavidKino,

         

        You can but you are required to destroy your existing volume and set it in Flex-RAID 0 in order for you to use the whole volume capacity. I suggest that you check this page before you make any changes.

         

         

        Kind regards,

         

        BrianL
        NETGEAR Community Team

  • omicron_persei8's avatar
    omicron_persei8
    Luminary
    Jul 05, 2016
    On two disks, on a RN204, you're probably better off using JBOD instead of RAID0. That way you can use mixed capacities. And the RAID0 performance increase would probably be very un-noticeable anyway.
    • StephenB's avatar
      StephenB
      Guru - Experienced User
      Jul 05, 2016
      omicron_persei8 wrote:
      On two disks, on a RN204, you're probably better off using JBOD instead of RAID0. That way you can use mixed capacities. And the RAID0 performance increase would probably be very un-noticeable anyway.

      Most users are better off not using either mode to span multiple disks.

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