Changing coresize in /etc/tos.conf to 8GB indeed helped to make the second partition larger during the setup process.
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[admin@TNAS-138E ~]$ parted /dev/sda
GNU Parted 3.2
Using /dev/sda
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) p
Model: ATA WDC WD120EFAX-68 (scsi)
Disk /dev/sda: 12.0TB
Sector size (logical/physical): 512B/4096B
Partition Table: gpt
Disk Flags:
Number Start End Size File system Name Flags
1 1049kB 300MB 299MB ext4 primary
[b] 2 300MB 8899MB 8599MB ext4 primary[/b]
3 8899MB 9923MB 1023MB primary
4 9923MB 12.0TB 12.0TB primary
@TMzethar: What to try next?