I followed the instructions on how to create an iscsi LUN in linux using this guide.
https://www.tecmint.com/setup-iscsi-...r-on-debian-9/
Which worked fine.

Now I want to undo what I just did and I can't seem to delete the partition or volume that is attached to drive sdd. How can I wipe drive sdd to get rid of this "lun_01-vol_01" volume or partition that I have now?

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You've just created or set up an LVM disk. Logical Volume Management basically means you stop worrying about partitions, just create directories and write stuff and LVM will apportion sizes. The guide envisages you making several lvm disks and pooling them to have cloud or server size storage.

Is that what you're doing? What exactly are you doing?
/dev/sdd is ~1TB; /dev/sdb, & /dev/sdc are 3.7TB each. You have over 8TB of storage there, which you could partition as one LVM volume. I would do the sensible thing first which is to back up. OTOH, if you're a home hoarder, I think you're going to have to go low level to get rid of lvm on sdd. Back up! Then google it. You can certainly dd over the first chunk of the disk, and go again with a fresh partition table, make filesystems, etc. There might be an easier way on google. Once we know where you're pointing and with what, guys are helpful.

I need to learn about vSphere 6.5. I want to create a LUN for vCenter server. I would like to add that LUN as a data store in vCenter server.

This is ONLY for testing purposes. The other drives sdb and sdc have nothing to do with this. I only want to use sdd (1TB) for this exercise. There is no data on here that I care about.

Again how do I delete or remove the LVM disk?

No expert here. I budget my space fairly carefully and avoid lvm.

There's 'lvdisplay' and 'lvremove' but it needs to be unused. Each have man pages. Numerous guides exist online, I've seen an lvm capable boot disk recommended.

I guess if you do have a real physical disk here then you can just wipe it by using partition tools I'd think.

To be more linux like you probably use LVM tools. https://www.howtogeek.com/howto/4070...ent-in-ubuntu/

Something like this I'd think.

umount /mnt/lvstuff
lvremove /dev/vgpool/lvstuff
vgremove vgpool
pvremove /dev/sdb1 /dev/sdc1

Use your names and naming.

Thanks for the feed back guys.

I don't know what I did but none of the LVM commands show anything (lvdisplay, pvdisplay, etc...), but if I type "lsblk" I see the LVM.

Right now I just gave up and started running DBAN on it. I didn't want to go this route because it takes sooooo long but at this point I don't think I have a choice. I tried GParted, wipe and dd to remove and reformat the disk but nothing worked.

I'll keep you posted tomorrow.

Yes, after running DBAN on the sdd (1TB) drive it finally removed the LVM.

Thanks for the update and solution.