A opção de verificação -ahmac / sha256 requer 11% de acordo com a página do manual. O problema era ter a verificação ativada sem definir o tamanho de setor padrão especificado, exigindo 50%. ou seja, especifique -s4096 com -ahmac / sha256
# geli init -l256 -eaes -ahmac/sha256 -J /root/da0.txt -B /root/da0.eli -K /root/da0.key /dev/da0
# geli attach -k /root/da0.key /dev/da0
# geli list
1. Name: da0.eli
Mediasize: 125029674496 (116G)
Sectorsize: 512
Mode: r0w0e0
Consumers:
1. Name: da0
Mediasize: 250059350016 (233G)
Sectorsize: 512
Mode: r1w1e1
# geli init -l256 -eaes -J /root/da0.txt -B /root/da0.eli -K /root/da0.key /dev/da0
# geli attach -k /root/da0.key /dev/da0
# geli list
1. Name: da0.eli
Mediasize: 250059349504 (233G)
Sectorsize: 512
Mode: r0w0e0
Consumers:
1. Name: da0
Mediasize: 250059350016 (233G)
Sectorsize: 512
Mode: r1w1e1
# geli init -s4096 -l256 -eaes -ahmac/sha256 -J /root/da0.txt -B /root/da0.eli -K /root/da0.key /dev/da0
# geli attach -k /root/da0.key /dev/da0
# geli list
1. Name: da0.eli
Mediasize: 222274973696 (207G)
Sectorsize: 4096
Mode: r0w0e0
Consumers:
1. Name: da0
Mediasize: 250059350016 (233G)
Sectorsize: 512
Mode: r1w1e1