nas ~ # fdisk -l
Disk /dev/sda: 2.7 TiB, 3000592982016 bytes, 5860533168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: gpt
Disk identifier: 0C5623E2-2FF4-4787-9609-750745C161DA
Device           Start          End   Size Type
/dev/sda1         2048      1026047   500M EFI System
/dev/sda2      1026048      2050047   500M Linux RAID
/dev/sda3      2050048    106907647    50G Linux RAID
/dev/sda4    106907648   2983721397   1.3T Linux RAID
/dev/sda5   2983723008   5860533134   1.3T Linux RAID
Disk /dev/sdb: 1.4 TiB, 1500301910016 bytes, 2930277168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: C767012E-AA8B-4ACE-AD4A-8ADCAB4300D5
Device           Start          End   Size Type
/dev/sdb1         2048      1026047   500M Linux RAID
/dev/sdb2      1026048     53460000    25G Linux RAID
/dev/sdb3     53460992   2930277134   1.3T Linux RAID
Disk /dev/sdc: 1.4 TiB, 1500301910016 bytes, 2930277168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: 4B660130-B8DD-4BA3-9D8C-615F929B0433
Device           Start          End   Size Type
/dev/sdc1         2048      1026047   500M Linux RAID
/dev/sdc2      1026048     53460000    25G Linux RAID
/dev/sdc3     53460992   2930277134   1.3T Linux RAID
Disk /dev/sdd: 1.4 TiB, 1500301910016 bytes, 2930277168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: D01BE9B6-18F2-4C99-B30B-544B0C9BFA62

Device           Start          End   Size Type
/dev/sdd1         2048      1026047   500M Linux RAID
/dev/sdd2      1026048     53460000    25G Linux RAID
/dev/sdd3     53460992   2930277134   1.3T Linux RAID


Disk /dev/sde: 2.7 TiB, 3000592982016 bytes, 5860533168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: gpt
Disk identifier: 0C5623E2-2FF4-4787-9609-750745C161DA

Device           Start          End   Size Type
/dev/sde1         2048      1026047   500M EFI System
/dev/sde2      1026048      2050047   500M Linux RAID
/dev/sde3      2050048    106907647    50G Linux RAID
/dev/sde4    106907648   5860533134   2.7T Linux RAID


Disk /dev/sdf: 2.7 TiB, 3000592982016 bytes, 5860533168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: gpt
Disk identifier: 0C5623E2-2FF4-4787-9609-750745C161DA

Device           Start          End   Size Type
/dev/sdf1         2048      1026047   500M EFI System
/dev/sdf2      1026048      2050047   500M Linux RAID
/dev/sdf3      2050048    106907647    50G Linux RAID
/dev/sdf4    106907648   5860533134   2.7T Linux RAID


Disk /dev/md2: 75 GiB, 80533782528 bytes, 157292544 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 524288 bytes / 1572864 bytes

Disk /dev/md0: 500 MiB, 524275712 bytes, 1023976 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes

Disk /dev/md3: 4 TiB, 4418775810048 bytes, 8630421504 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 524288 bytes / 1572864 bytes