I got “Could not allocate requested partitions: requested size exceeds maximum allowed” while installing RHEL on a SAN.

Linux seems to be having a max partition size of 2.2TB (2TB).


  1. Stop partitioning, click ‘back’
  2. Go to a text terminal (alt-f2)
  3. Find the device you want to put a 2GB+ system on: ls -al /dev/mapper/
  4. Type parted /dev/device-id-you-just-found
  5. mklabel gpt
  6. quit
  7. Go back to installation and create a 2TB+ volume :)

By karlo