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Ubuntu 20.04 does not detect all disks capacity

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I am setting up 2 servers A and B with same hardwares except:

On server A, I put 4 disks, 2TB/each and configure 2 volumes of RAID 1.

  • Volume BOOT - RAID1 - Disk A0, A1. Total: 1.8TB.
  • Volume DATA - RAID1 - Disk A2, A3. Total: 1.8TB.

On server B, I also put 4 disks, also configure 2 volumes of RAID 1 but with 4TB/each disk.

  • Volume BOOT - RAID1 - Disk B0, B1. Total: 3.4TB.
  • Volume DATA - RAID1 - Disk B2, B3. Total: 3.4TB. enter image description here

I installed Ubuntu Desktop version 20.04 on both servers. I opened Disk Utilities software to check the capacity on both servers. Server A detected 2 volumes correctly with 1.8TB each. However, Server B detected 2 volumes are just 1.6TB on each (expected 3.4TB as image shows). In total I only have 3.2TB available to use.

Would you please help me to find out what was wrong with my setup?

Thank you for reading.

mangohost

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