[ovirt-users] Re: Removing Direct Mapped LUNs
On Friday, 16 July 2021 12:31:34 CEST Gianluca Cecchi wrote:
On Fri, Jul 16, 2021 at 11:15 AM Vojtech Juranek
<vjuranek(a)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 ~]#
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