[CentOS] File description left open in LVM

Hello, I used to have LVM on my machine to combine the capacity of a hard drive and a partition on a different drive as one volume group. I had problem with one of the disk but I was able to remove all the data of the computer, and replace the disk, and add another disk

Now I want to start over and create LVM again. However, I keep getting this message: # vgdisplay File descriptor 128 left open File descriptor 129 left open No volume groups found # pvdisplay File descriptor 128 left open File descriptor 129 left open

What does this mean ? Also, in /etc/lvm I found archive/ and backup/ directory which seems to refer to my old LVM, and also .cache. Are they safe to remove ?

Thank you for any help. RDB