[linux-lvm] Can't remove the snap LV of root volume on multipath disk PV

[linux-lvm] Can't remove the snap LV of root volume on multipath disk PV

[Gang He]

Hello List,

I am using lvm2-2.02.180 on SLES12SP4, I cannot remove the snap LV of root volume, which is based on multipath disk PV.
e.g. 
linux-kkay:/ # lvremove /dev/system/snap_root
  WARNING: Reading VG system from disk because lvmetad metadata is invalid.
Do you really want to remove active logical volume system/snap_root? [y/n]: y
  device-mapper: reload ioctl on  (254:3) failed: Invalid argument
  Failed to refresh root without snapshot.

But, I can remove the snap LV of data volume successfully, e.g.
linux-kkay:/ # lvremove /dev/system/data_snap
  WARNING: Reading VG system from disk because lvmetad metadata is invalid.
Do you really want to remove active logical volume system/data_snap? [y/n]: y
  Logical volume "data_snap" successfully removed

If I use the ordinary disk as PV (rather than multipath disk), I cannot encounter this problem (both snap LVs can be removed).

The disk layout is as below,
linux-kkay:/ # lsblk
NAME                       MAJ:MIN RM  SIZE RO TYPE  MOUNTPOINT
sda                          8:0    0   30G  0 disk
��sda1                       8:1    0   30G  0 part
��mpd_root                 254:0    0   30G  0 mpath
  ��mpd_root-part1         254:1    0   30G  0 part
    ��system-root-real     254:2    0   10G  0 lvm
    � ��system-root        254:3    0   10G  0 lvm   /
    � ��system-snap_root   254:5    0   10G  0 lvm
    ��system-snap_root-cow 254:4    0    5G  0 lvm
    � ��system-snap_root   254:5    0   10G  0 lvm
    ��system-swap          254:6    0    2G  0 lvm   [SWAP]
    ��system-data-real     254:8    0    4G  0 lvm
    � ��system-data        254:7    0    4G  0 lvm   /data
    � ��system-data_snap   254:10   0    4G  0 lvm
    ��system-data_snap-cow 254:9    0  840M  0 lvm
      ��system-data_snap   254:10   0    4G  0 lvm
sdb                          8:16   0   30G  0 disk
��sdb1                       8:17   0   30G  0 part
��mpd_root                 254:0    0   30G  0 mpath
  ��mpd_root-part1         254:1    0   30G  0 part
    ��system-root-real     254:2    0   10G  0 lvm
    � ��system-root        254:3    0   10G  0 lvm   /
    � ��system-snap_root   254:5    0   10G  0 lvm
    ��system-snap_root-cow 254:4    0    5G  0 lvm
    � ��system-snap_root   254:5    0   10G  0 lvm
    ��system-swap          254:6    0    2G  0 lvm   [SWAP]
    ��system-data-real     254:8    0    4G  0 lvm
    � ��system-data        254:7    0    4G  0 lvm   /data
    � ��system-data_snap   254:10   0    4G  0 lvm
    ��system-data_snap-cow 254:9    0  840M  0 lvm
      ��system-data_snap   254:10   0    4G  0 lvm

Thanks
Gang

Re: [linux-lvm] Can't remove the snap LV of root volume on multipath disk PV

[Zdenek Kabelac]

Dne 01. 07. 19 v 8:31 Gang He napsal(a):
> Hello List,
> 
> I am using lvm2-2.02.180 on SLES12SP4, I cannot remove the snap LV of root volume, which is based on multipath disk PV.
> e.g.
> linux-kkay:/ # lvremove /dev/system/snap_root
>    WARNING: Reading VG system from disk because lvmetad metadata is invalid.
> Do you really want to remove active logical volume system/snap_root? [y/n]: y
>    device-mapper: reload ioctl on  (254:3) failed: Invalid argument
>    Failed to refresh root without snapshot.
> 
> But, I can remove the snap LV of data volume successfully, e.g.
> linux-kkay:/ # lvremove /dev/system/data_snap
>    WARNING: Reading VG system from disk because lvmetad metadata is invalid.
> Do you really want to remove active logical volume system/data_snap? [y/n]: y
>    Logical volume "data_snap" successfully removed
> 
> If I use the ordinary disk as PV (rather than multipath disk), I cannot encounter this problem (both snap LVs can be removed).
>

Hi

Please open new BZ case and provide full -vvvv traces of failing command
and also possibly attache  'dmsetup table' 'dmsetup ls --tree' and
'dmsetup info -c' 'dmsetup status'


Regards

Zdenek

Re: [linux-lvm] Can't remove the snap LV of root volume on multipath disk PV

[Gang He]

Hi Zdenek,

Thank for your reply, the bug is opened at https://bugzilla.redhat.com/show_bug.cgi?id=1726524
I feel maybe RHEL lvm2 also has the similar problem.
The problem looks to related with multipath disk PV. 

Thanks
Gang

-----Original Message-----
From: Zdenek Kabelac [mailto:zkabelac@redhat.com] 
Sent: 2019��7��1�� 18:23
To: LVM general discussion and development <linux-lvm@redhat.com>; Gang He <GHe@suse.com>
Subject: Re: Can't remove the snap LV of root volume on multipath disk PV

Dne 01. 07. 19 v 8:31 Gang He napsal(a):
> Hello List,
> 
> I am using lvm2-2.02.180 on SLES12SP4, I cannot remove the snap LV of root volume, which is based on multipath disk PV.
> e.g.
> linux-kkay:/ # lvremove /dev/system/snap_root
>    WARNING: Reading VG system from disk because lvmetad metadata is invalid.
> Do you really want to remove active logical volume system/snap_root? [y/n]: y
>    device-mapper: reload ioctl on  (254:3) failed: Invalid argument
>    Failed to refresh root without snapshot.
> 
> But, I can remove the snap LV of data volume successfully, e.g.
> linux-kkay:/ # lvremove /dev/system/data_snap
>    WARNING: Reading VG system from disk because lvmetad metadata is invalid.
> Do you really want to remove active logical volume system/data_snap? [y/n]: y
>    Logical volume "data_snap" successfully removed
> 
> If I use the ordinary disk as PV (rather than multipath disk), I cannot encounter this problem (both snap LVs can be removed).
>

Hi

Please open new BZ case and provide full -vvvv traces of failing command and also possibly attache  'dmsetup table' 'dmsetup ls --tree' and 'dmsetup info -c' 'dmsetup status'


Regards

Zdenek