New to Linux - how to tell if a partition is formated?

first try

df -hT

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this will show you the file system (with free space)
failing that (in case it isn't mounted), check parted

sudo parted -l /dev/sda

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number 3 will show the file system if formatted
also, what version of veeam?

if you can mount the partition it is formatted.
 mount
if it is listed it is formated.


As an advice, you are missing swap in your partitioning.

Consider using LVM as the overlay

provides for dynamic partitioning.

Is the flavor of filesystem on /dev/sda3 something that Veeam understands?  (is it ext4, zfs, btrfs, etc etc)

Check your veeam settings and whether it reflects how.mich of the actual data in use it backed up.
I.e.our of the 1.7T available space, currently only 15.6FB are ised.
Veeam does not backup the empty space to reflect the entire partition's size.

are you sure you did not format 15 GB ?  it's only a matter of comma

Seth -  Very new at this so leaning as I go.  Here are the outputs:
df -hT
Filesystem                        Type      Size  Used Avail Use% Mounted on
udev                              devtmpfs   16G     0   16G   0% /dev
tmpfs                             tmpfs     3.2G  2.3M  3.2G   1% /run
/dev/mapper/ubuntu--vg-ubuntu--lv ext4      196G   14G  172G   8% /
tmpfs                             tmpfs      16G     0   16G   0% /dev/shm
tmpfs                             tmpfs     5.0M     0  5.0M   0% /run/lock
tmpfs                             tmpfs      16G     0   16G   0% /sys/fs/cgroup
/dev/sda2                         ext4      976M  112M  798M  13% /boot
/dev/loop1                        squashfs  100M  100M     0 100% /snap/core/11420
/dev/loop2                        squashfs   56M   56M     0 100% /snap/core18/1944
/dev/loop0                        squashfs   11M   11M     0 100% /snap/canonical-livepatch/104
/dev/loop3                        squashfs   56M   56M     0 100% /snap/core18/2128
/dev/loop5                        squashfs   70M   70M     0 100% /snap/lxd/19188
/dev/loop4                        squashfs   32M   32M     0 100% /snap/snapd/10707
/dev/loop6                        squashfs   66M   66M     0 100% /snap/powershell/173
/dev/loop7                        squashfs   33M   33M     0 100% /snap/snapd/12704
/dev/loop8                        squashfs   71M   71M     0 100% /snap/lxd/21029
tmpfs                             tmpfs     3.2G   28K  3.2G   1% /run/user/1000



sudo parted -l /dev/sda
Model: HP LOGICAL VOLUME (scsi)
Disk /dev/sda: 1800GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags:

Number  Start   End     Size    File system  Name  Flags
 1      1049kB  2097kB  1049kB                     bios_grub
 2      2097kB  1076MB  1074MB  ext4
 3      1076MB  1800GB  1799GB


Model: Linux device-mapper (linear) (dm)
Disk /dev/mapper/ubuntu--vg-ubuntu--lv: 215GB
Sector size (logical/physical): 512B/512B
Partition Table: loop
Disk Flags:

Number  Start  End    Size   File system  Flags
 1      0.00B  215GB  215GB  ext4

try mount /dev/sda3 /mnt
and see if it can be mounted.

Was this just an initial install? 1.8TB 99% of your capacity is part of this /dev/sda3 partition.

It might be easier if you specify what it is you are trying to do, and whether it should be reinstalled with better partitioning

Hi,
As root (or sudo command) issue 

vgdisplay -v

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and

lvdisplay --maps

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and post the output.

Regards,
   Tomas Helgi

arnold - This was an initial install.  Total hdd space is 1.8TB on bare metal.  We are using Veeam as our backup/replication tool.  We are attempting to setup Immutable backups through Veeam.  We have 0% experience in Linux and are trying to work through this.  I have taken two online course on Linux.  So very limited (dangerous) knowledge about Linux or it's infrastructure.  But you have to start somewhere.  So I have an initial install of ubuntu 20.4.2.  I have successfully installed VNC to provide remote control capability while in the lab.  I have presented the Host (Linux) to Veeam.  I am attempting to set up a Veeam backup repository using excess capacity on the Linux server.  That capacity seems to be associated with sda3 (1.7TB).  Once I have access to this storage space, I would create a backup job in Veeam pointing to this storage and set the backup to be immutable.

mount: /mnt: /dev/sda3 already mounted or mount point busy

Tomas

sudo vgdisplay -v
  No volume groups found.
sudo lvdisplay --maps
:~$

Hi,
Looks like you don't have any filesystem on /dev/sda3
Execute

sudo fdisk -l

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or

sudo fdisk -l | grep sda3

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And post the output.

Regards,
    Tomas Helgi