Description of problem:
Can not bring host2 to up to running state. Failed

Version-Release number of selected component (if applicable):
ovirt-engine 3.6.7.5-1

host1 - running SPM and 47vm:
OS Version:
RHEL - 6 - 7.el6.centos.12.3
Kernel Version:
2.6.32 - 573.12.1.el6.x86_64
KVM Version:
0.12.1.2 - 2.479.el6_7.2
LIBVIRT Version:
libvirt-0.10.2-54.el6_7.3
VDSM Version:
vdsm-4.16.30-0.el6
SPICE Version:
0.12.4 - 12.el6_7.3

host2 - Non-Operational state, cannot activate it:
OS Version:
RHEL - 6 - 8.el6.centos.12.3
Kernel Version:
2.6.32 - 642.4.2.el6.x86_64
KVM Version:
0.12.1.2 - 2.479.el6_7.2
LIBVIRT Version:
libvirt-0.10.2-60.el6
VDSM Version:
vdsm-4.16.30-0.el6
SPICE Version:



How reproducible:
unknown

Steps to Reproduce:
1. I updated os and vdsm on host2.
2. Trying to activate host2.
3.

Actual results:
Activating of host vochomurka failed with error: 
Host vochomurka cannot access the Storage Domain(s) <UNKNOWN> attached to the Data Center DCHK. Setting Host state to Non-Operational.

I see in error vdsmd log on host this error:
MiscBlockReadException: Internal block device read failure: 'name=/dev/69487b75-090d-40c0-8a12-50f90b7aad75/metadata, offset=0, size=2048'

But i i try read it, it is readable
dd if=/dev/69487b75-090d-40c0-8a12-50f90b7aad75/metadata of=/dev/null bs=1M
512+0 records in
512+0 records out
536870912 bytes (537 MB) copied, 4.21475 s, 127 MB/s


Expected results:
second node(host) up and running to serve vm's

Additional info:
I think all iscsi resources is available