Here is the information you asked for.  On a side note, I reinstalled fresh with just updates. If it is important I use the MATE Desktop.  Also noticed that when I went  to update my machine, Synaptic package manager would not respond. So used "sudo apt update && sudo apt dist-upgrade".

Thank you for a great OS.
rob630

rob@Devuan-990:~$ lsblk
NAME   MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
sda      8:0    0   477G  0 disk
├─sda1   8:1    0 126.3G  0 part
├─sda2   8:2    0     1K  0 part
├─sda5   8:5    0  11.7G  0 part [SWAP]
├─sda6   8:6    0  78.1G  0 part
├─sda7   8:7    0  78.1G  0 part
└─sda8   8:8    0  39.1G  0 part /
sdb      8:16   0   2.7T  0 disk
└─sdb1   8:17   0   2.7T  0 part
sdc      8:32   0   2.7T  0 disk
├─sdc1   8:33   0   1.5T  0 part
├─sdc2   8:34   0 830.9G  0 part
└─sdc3   8:35   0 405.8G  0 part
sdd      8:48   0   3.7T  0 disk
├─sdd1   8:49   0   2.8T  0 part
└─sdd2   8:50   0 864.4G  0 part
sr0     11:0    1  1024M  0 rom

cat: fstab: No such file or directory
rob@Devuan-990:~$ cat /etc/fstab
# /etc/fstab: static file system information.
#
# Use 'blkid' to print the universally unique identifier for a
# device; this may be used with UUID= as a more robust way to name devices
# that works even if disks are added and removed. See fstab(5).
#
# <file system> <mount point>   <type>  <options>       <dump>  <pass>
# / was on /dev/sda8 during installation
UUID=252eaff3-1151-4140-9f59-244710ac07c1 /               ext4    errors=remount-ro 0       1
# swap was on /dev/sda5 during installation
UUID=b74103bc-d980-448c-a38e-46001c870159 none            swap    sw              0       0
/dev/sr0        /media/cdrom0   udf,iso9660 user,noauto     0       0

rob@Devuan-990:~$ cat /etc/mtab
rootfs / rootfs rw 0 0
sysfs /sys sysfs rw,nosuid,nodev,noexec,relatime 0 0
proc /proc proc rw,nosuid,nodev,noexec,relatime 0 0
udev /dev devtmpfs rw,relatime,size=10240k,nr_inodes=1000746,mode=755 0 0
devpts /dev/pts devpts rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000 0 0
tmpfs /run tmpfs rw,nosuid,noexec,relatime,size=808908k,mode=755 0 0
/dev/sda8 / ext4 rw,relatime,errors=remount-ro,data=ordered 0 0
tmpfs /run/lock tmpfs rw,nosuid,nodev,noexec,relatime,size=5120k 0 0
pstore /sys/fs/pstore pstore rw,relatime 0 0
tmpfs /run/shm tmpfs rw,nosuid,nodev,noexec,relatime,size=4075400k 0 0
fusectl /sys/fs/fuse/connections fusectl rw,relatime 0 0
rpc_pipefs /run/rpc_pipefs rpc_pipefs rw,relatime 0 0

rob@Devuan-990:~$ sudo pvs
sudo: pvs: command not found

rob@Devuan-990:~$ sudo vgs
sudo: vgs: command not found

rob@Devuan-990:~$  sudo lvs
sudo: lvs: command not found