I have a large raid (lsi megaraid sas2 9261-8i card) and when I use parted to initialize it as the one big partition I want, it gives me a warning.
# parted /dev/sda "mklabel gpt" Warning: The existing disk label on /dev/sda will be destroyed and all data on this disk will be lost. Do you want to continue? Yes/No? yes # parted -a optimal /dev/sda "mkpart primary 128s -1s" Warning: You requested a partition from 65.5kB to 81.0TB. The closest location we can manage is 65.5kB to 81.0TB. Is this still acceptable to you? Yes/No? yes Warning: The resulting partition is not properly aligned for best performance. Ignore/Cancel? i Information: You may need to update /etc/fstab.
The sector size is 512b actual, the raid stripe size is 64kB, hence starting the partition on sector 128. I've tried various combinations of -a, nothing seems to help here.