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I have RAID with small disk and want to expand the RAID with larger disks, why I can't get the full capacity for 2TB disks or larger disks?(For 32bit model)
Posted by James Huang on 28 November 2012 11:41
Q: I have RAID with small disk and want to expand the RAID with larger disks, why I can't get the full capacity for 2TB disks or larger disks?(For 32bit model)

A: With firmware V3.x.x, the system use MBR to part the disks and create the RAID, due to MBR format can not manage each disk larger than 2TB, if user want to expand the RAID with larger disk, he can't get full capacity.

Firmware V5.x.x has implemented GPT partition table format to create the RAID and could handle larger disks.

Example:

A: Create RAID on FW V3.x.x

  1. Use two 500GB disks to create a RAID1 volume on FW V3.x.x
  2. Then upgrade to FW V5.x.x
  3. Replace 500GB disks with 3TB disks,but can't expand the RAID to full capacity but only 2TB.(MBR parition table format's limitation)

B:Create RAID on FW V5.x.x
  1. Use two 500GB disks to create a RAID1 volume on FW V5.x.x
  2. Replace 500GB disks with 3TB disks and expand the RAID with full capacity.

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