On Friday, 16 July 2021 12:31:34 CEST Gianluca Cecchi wrote:
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
This means there's some open connection. As lsof or fuser doesn't show anything I wonder how this could happen. Theoretically (not tested as I actually don't know how to reproduce this) and on your own risk:-), you can try dmsetup suspend /dev/mapper/36090a0d800851c9d2195d5b837c9e328 dmsetup clear /dev/mapper/36090a0d800851c9d2195d5b837c9e328 dmsetup wipe_table /dev/mapper/36090a0d800851c9d2195d5b837c9e328 which should remove any stale connection. After that dmsetup info should show Open count 0 and multipath -f 36090a0d800851c9d2195d5b837c9e328 should work
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 ~]#