Hello evryone,
setup ovirt 4.4.1 on CentOS 8.2 as an experiment, and I am trying to get an
iSCSI domain working but have issues. The little experimental cluster has 3
hosts. There is an ovirtmgmt network on the default vlan, and two iSCSI network
(172.27.0/1.X) with vlans 20/21. ovirtmgmt has all the functions (Data,
display, migration etc), and the iSCSI networks nothing yet, and they are not
set as required.
The SAN device is already serving a few iSCSI volumes to a vmware cluster, so I
know things are fine on this end. It has two controllers, and four NICs per
controller so a total of 8 NICs, half of the NICS per controller on 172.27.0.X
and half on 172.27.1.X.
When I create the iSCSI domain, I login to only one of the targets, and add the
Volume, all is good and I can use the disc fine.
However when I login to more than one of the targets, then I start having
issues with the Volume. Even when I enabled multipath in the cluster, and I
created a single multipath by selecting both of the 172.27.0/1.X networks, and
all the targets, the end result was the same. The hosts have difficulty
accessing the volume, they may even swing between 'non-operational' and 'up' if
I transfer data to the volume. When I ssh to the hosts and i check things in
the command line I also get inconsistent results between hosts, and blocks that
appear with lsblk when I first setup iSCSI have dissapeared after I try to
actively use the volume.
I am new to iSCSI so I am not sure how to debug this. I am not sure if my
multipath configuration is correct or not. The documentation on this part was
not very detailed. I also tried to remove the domain, and try to experiment
with mounting the iSCSI volume from the command line, but I cannot even
discover the target from the command line, which is very bizarre. The command
iscsiadm --mode discovery --target sendtargets --portal 172.27.0.55 --discover
returns the message 'iscsiadm: cannot make connection to 172.27.0.55: No route
to host'. Yet through ovirt, and if I select only one target, everything work
fine!
Any suggestions on how to start debugging this would really be appreciated.
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