Hello,

I'm running my Ovirt-Node-NG based Hosts off ISCSI root. That is what "vdsm-tool config-lvm-filter" suggests. Is this correct ?

[root@myhostname ~]# vdsm-tool config-lvm-filter
Analyzing host...
Found these mounted logical volumes on this host:

  logical volume:  /dev/mapper/onn_myhostname--iscsi-home
  mountpoint:      /home
  devices:         /dev/mapper/mpath-myhostname-disk1p2

  logical volume:  /dev/mapper/onn_myhostname--iscsi-ovirt--node--ng--4.2.7.1--0.20181209.0+1
  mountpoint:      /
  devices:         /dev/mapper/mpath-myhostname-disk1p2

  logical volume:  /dev/mapper/onn_myhostname--iscsi-swap
  mountpoint:      [SWAP]
  devices:         /dev/mapper/mpath-myhostname-disk1p2

  logical volume:  /dev/mapper/onn_myhostname--iscsi-tmp
  mountpoint:      /tmp
  devices:         /dev/mapper/mpath-myhostname-disk1p2

  logical volume:  /dev/mapper/onn_myhostname--iscsi-var
  mountpoint:      /var
  devices:         /dev/mapper/mpath-myhostname-disk1p2

  logical volume:  /dev/mapper/onn_myhostname--iscsi-var_crash
  mountpoint:      /var/crash
  devices:         /dev/mapper/mpath-myhostname-disk1p2

  logical volume:  /dev/mapper/onn_myhostname--iscsi-var_log
  mountpoint:      /var/log
  devices:         /dev/mapper/mpath-myhostname-disk1p2

  logical volume:  /dev/mapper/onn_myhostname--iscsi-var_log_audit
  mountpoint:      /var/log/audit
  devices:         /dev/mapper/mpath-myhostname-disk1p2

This is the recommended LVM filter for this host:

  filter = [ "a|^/dev/mapper/mpath-myhostname-disk1p2$|", "r|.*|" ]

This filter allows LVM to access the local devices used by the
hypervisor, but not shared storage owned by Vdsm. If you add a new
device to the volume group, you will need to edit the filter manually.

Configure LVM filter? [yes,NO]

Hello Greg,

this is what i was looking for.

After running "vdsm-tool config-lvm-filter" on all hosts (and rebooting them) all PVs, VGs and LVs from ISCSI domain were not visible anymore to local LVM on the ovirt hosts.

Additionally i made following tests:
- Cloning + running a VM on the ISCSI domain
- Detaching + (re-)attaching of the ISCSI domain
- Detaching, removing + (re-)import of the ISCSI domain 
- Creating new ISCSI domain (well, i needed to use "force operation" because creating on same ISCSI target)

All tests were successful.

As you wished i filed a bug: <https://github.com/oVirt/ovirt-site/issues/1857>
Thank you.

Best regards,
Robert
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