On Fri, Jul 16, 2021 at 11:15 AM Vojtech Juranek <vjuranek@redhat.com> wrote:

>
> What to do to crosscheck what is using the device and so preventing the
> "-f" to complete?

can you try

dmsetup info /dev/mapper/36090a0d800851c9d2195d5b837c9e328

and check "Open count" filed to see if there is still anything open?

Also, you can try

fuser /dev/dm-2

to see which process is using the device

[root@ov301 ~]# dmsetup info /dev/mapper/36090a0d800851c9d2195d5b837c9e328
Name: 36090a0d800851c9d2195d5b837c9e328
State: ACTIVE
Read Ahead: 256
Tables present: LIVE
Open count: 1
Event number: 0
Major, minor: 253, 2
Number of targets: 1
UUID: mpath-36090a0d800851c9d2195d5b837c9e328

[root@ov301 ~]# fuser /dev/dm-2
[root@ov301 ~]# echo $?
1
[root@ov301 ~]# ll /dev/dm-2
brw-rw----. 1 root disk 253, 2 Jul 15 11:28 /dev/dm-2

I'm still unable to remove it:

[root@ov301 ~]# multipath -f 36090a0d800851c9d2195d5b837c9e328
Jul 16 12:25:11 | 36090a0d800851c9d2195d5b837c9e328: map in use
[root@ov301 ~]#