login as: root
root@192.168.1.7's password:
Linux NAS 4.19.0-0.bpo.2-amd64 #1 SMP Debian 4.19.16-1~bpo9+1 (2019-02-07) x86_6                                                           4

The programs included with the Debian GNU/Linux system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.

Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.
Last login: Thu Feb 14 17:13:57 2019 from 192.168.1.10

root@NAS:~# btrfs fi show
Label: 'Almacen'  uuid: ddfaf6d7-822e-4223-a195-8f641961ef4a
        Total devices 3 FS bytes used 5.93TiB
        devid    1 size 1.82TiB used 1.75TiB path /dev/sdc
        devid    2 size 3.64TiB used 2.54TiB path /dev/sdd
        devid    3 size 1.82TiB used 1.69TiB path /dev/sdb

root@NAS:~# blkid
/dev/sda1: UUID="9fd44006-affb-431e-a293-b28c53f56e00" TYPE="ext4" PARTUUID="ecbbb55e-01"
/dev/sda3: LABEL="Descargas" UUID="ef6c2291-292f-43d6-a853-dcded158f6b8" TYPE="ext4" PARTUUID="ecbbb55e-03"
/dev/sda5: UUID="d5c36085-5549-452e-b7c7-56071a6f7676" TYPE="swap" PARTUUID="ecbbb55e-05"
/dev/sdb: LABEL="Almacen" UUID="ddfaf6d7-822e-4223-a195-8f641961ef4a" UUID_SUB="dad4ba51-9ada-4120-b3ed-b9b4bdb35d2d" TYPE="btrfs"
/dev/sdc: LABEL="Almacen" UUID="ddfaf6d7-822e-4223-a195-8f641961ef4a" UUID_SUB="5145542e-b4ce-4dfe-9279-2eed8a456d12" TYPE="btrfs"
/dev/sdd: LABEL="Almacen" UUID="ddfaf6d7-822e-4223-a195-8f641961ef4a" UUID_SUB="2ebe2294-df7b-4005-9ad9-3eaaf34b5e2a" TYPE="btrfs"

root@NAS:~# lsblk -f
NAME   FSTYPE LABEL     UUID                                 MOUNTPOINT
sda
+-sda1 ext4             9fd44006-affb-431e-a293-b28c53f56e00 /
+-sda2
+-sda3 ext4   Descargas ef6c2291-292f-43d6-a853-dcded158f6b8 /media/ef6c2291-292f-43d6-a853-dcded158f6b8
+-sda5 swap             d5c36085-5549-452e-b7c7-56071a6f7676 [SWAP]
sdb    btrfs  Almacen   ddfaf6d7-822e-4223-a195-8f641961ef4a
sdc    btrfs  Almacen   ddfaf6d7-822e-4223-a195-8f641961ef4a /media/ddfaf6d7-822e-4223-a195-8f641961ef4a
sdd    btrfs  Almacen   ddfaf6d7-822e-4223-a195-8f641961ef4a
root@NAS:~#