Как смонтировать второй жесткий диск на 2 ТБ на рабочем сервере?

У меня есть сервер с 2x2 ТБ, но только один диск I на 2 ТБ может получить доступ и смонтированный. Я не уверен, как смонтировать второй диск на 2 ТБ (пустой) на рабочем сервере, не теряя данные из первых 2 ТБ.

Вывод sudo fdisk -l:

WARNING: GPT (GUID Partition Table) detected on '/dev/sda'! The util
fdisk doesn't support GPT. Use GNU Parted.


Disk /dev/sda: 2000.4 GB, 2000398934016 bytes 255 heads, 63
sectors/track, 243201 cylinders, total 3907029168 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
Disk identifier: 0x00000000

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1               1  3907029167  1953514583+  ee  GPT

WARNING: GPT (GUID Partition Table) detected on '/dev/sdb'! The util
fdisk doesn't support GPT. Use GNU Parted.


Disk /dev/sdb: 2000.4 GB, 2000398934016 bytes 255 heads, 63
sectors/track, 243201 cylinders, total 3907029168 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
Disk identifier: 0x00000000

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1               1  3907029167  1953514583+  ee  GPT

Disk /dev/md3: 1978.9 GB, 1978886193152 bytes 2 heads, 4
sectors/track, 483126512 cylinders, total 3865012096 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
Disk identifier: 0x00000000

Disk /dev/md3 doesn't contain a valid partition table

Disk /dev/md2: 21.0 GB, 20970405888 bytes 2 heads, 4 sectors/track,
5119728 cylinders, total 40957824 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 Disk identifier:
0x00000000

Disk /dev/md2 doesn't contain a valid partition table

Вывод df -h:

Filesystem      Size  Used Avail Use% Mounted on
rootfs           20G  4.2G   14G  23% /
/dev/root        20G  4.2G   14G  23% /
devtmpfs        7.9G  4.0K  7.9G   1% /dev
none            1.6G  284K  1.6G   1% /run
none            5.0M     0  5.0M   0% /run/lock
none            7.9G     0  7.9G   0% /run/shm
/dev/md3        1.8T  416G  1.3T  25% /home

Вывод fro sudo mdadm - детализирует/dev/md3

/dev/md3:
        Version : 0.90
  Creation Time : Wed Jul 13 11:34:23 2016
     Raid Level : raid1
     Array Size : 1932506048 (1842.98 GiB 1978.89 GB)
  Used Dev Size : 1932506048 (1842.98 GiB 1978.89 GB)
   Raid Devices : 2
  Total Devices : 2
Preferred Minor : 3
    Persistence : Superblock is persistent

  Intent Bitmap : Internal

    Update Time : Sat Oct 29 12:30:25 2016
          State : active
 Active Devices : 2
Working Devices : 2
 Failed Devices : 0
  Spare Devices : 0

           UUID : 0fe79156:bfd477c3:a4d2adc2:26fd5302
         Events : 0.15411

    Number   Major   Minor   RaidDevice State
       0       8        3        0      active sync   /dev/sda3
       1       8       19        1      active sync   /dev/sdb3