Discussion in 'Storage Devices and Memory' started by jonclaud, Nov 27, 2014.

  1. jonclaud

    jonclaud Obliviot

    Nov 27, 2014
    I have a WD EX4 with 2 2TB HD's using Raid 5, with data on them, can I just add another 2TB HD without off loading my data.

    John P
  2. madmat

    madmat Soup Nazi

    Jun 16, 2005
    No soup for you!
    I believe it will rebuild the array and add 2/3 of that 2TB to the total.
  3. Tharic-Nar

    Tharic-Nar Senior Editor Staff Member Moderator

    Nov 25, 2009
    RAID 5 requires 3 drives to operate, so it sounds like a drive is not working or not connected, in which case, adding a third 2TB drive will not do anything for storage capacity, but will instead reintroduce redundancy and bring speeds back up to what they should be.

    This process should be completely automatic, or may require you to log into the NAS and tell it to rebuild the array. You will not have to migrate data during this process, however, the NAS may become very slow for a number of hours or days (for 4TB it should take a few hours), while it rebuilds the array. Storage capacity will not change, as stated above, unless you add another 2TB, i.e. running 4 in total.

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