Thank you very much for you response, now it feels I can barely see the
light !
So:
 multipath -ll
3614187705c01820022b002b00c52f72e dm-1 DELL    ,PERC H730P Mini
size=931G features='1 queue_if_no_path' hwhandler='0' wp=rw
`-+- policy='service-time 0' prio=1 status=active
  `- 0:2:0:0 sda     8:0   active ready running

lsblk

NAME                                                   MAJ:MIN RM   SIZE RO
TYPE  MOUNTPOINT
sda                                                      8:0    0   931G  0
disk
├─sda1                                                   8:1    0     1G  0
part
├─sda2                                                   8:2    0   930G  0
part
└─3614187705c01820022b002b00c52f72e                    253:1    0   931G  0
mpath
  ├─3614187705c01820022b002b00c52f72e1                 253:3    0     1G  0
part  /boot
  └─3614187705c01820022b002b00c52f72e2                 253:4    0   930G  0
part
    ├─onn-pool00_tmeta                                 253:6    0     1G  0
lvm
    │ └─onn-pool00-tpool                               253:8    0 825.2G  0
lvm
    │   ├─onn-ovirt--node--ng--4.2.3.1--0.20180530.0+1 253:9    0 798.2G  0
lvm   /
    │   ├─onn-pool00                                   253:12   0 825.2G  0
lvm
    │   ├─onn-var_log_audit                            253:13   0     2G  0
lvm   /var/log/audit
    │   ├─onn-var_log                                  253:14   0     8G  0
lvm   /var/log
    │   ├─onn-var                                      253:15   0    15G  0
lvm   /var
    │   ├─onn-tmp                                      253:16   0     1G  0
lvm   /tmp
    │   ├─onn-home                                     253:17   0     1G  0
lvm   /home
    │   └─onn-var_crash                                253:20   0    10G  0
lvm   /var/crash
    ├─onn-pool00_tdata                                 253:7    0 825.2G  0
lvm
    │ └─onn-pool00-tpool                               253:8    0 825.2G  0
lvm
    │   ├─onn-ovirt--node--ng--4.2.3.1--0.20180530.0+1 253:9    0 798.2G  0
lvm   /
    │   ├─onn-pool00                                   253:12   0 825.2G  0
lvm
    │   ├─onn-var_log_audit                            253:13   0     2G  0
lvm   /var/log/audit
    │   ├─onn-var_log                                  253:14   0     8G  0
lvm   /var/log
    │   ├─onn-var                                      253:15   0    15G  0
lvm   /var
    │   ├─onn-tmp                                      253:16   0     1G  0
lvm   /tmp
    │   ├─onn-home                                     253:17   0     1G  0
lvm   /home
    │   └─onn-var_crash                                253:20   0    10G  0
lvm   /var/crash
    └─onn-swap                                         253:10   0     4G  0
lvm   [SWAP]
sdb                                                      8:16   0   931G  0
disk
└─sdb1                                                   8:17   0   931G  0
part
sdc                                                      8:32   0   4.6T  0
disk
└─sdc1                                                   8:33   0   4.6T  0
part
nvme0n1                                                259:0    0   1.1T  0
disk


So the multipath "3614187705c01820022b002b00c52f72e" that was shown in the
error  is actually the root filesystem, which was created at node
installation ( from iso ).
Is this mpath ok that is activated on sda ?
What should I do in this situation ?
Thank you very much for help !

On Tue, Jun 12, 2018 at 5:52 PM, femi adegoke <ov...@fateknollogee.com>
wrote:

> Yes Leo, single host install can be done!
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-- 
Best regards, Leo David
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