On Tue, Jul 28, 2020 at 8:56 AM Nick Kas via Users <users(a)ovirt.org> wrote:
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.
maybe /var/log/vdsm/vdsm.log could tell more.
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
you are mixing "--target" with "--type", should be:
iscsiadm --mode discovery --type sendtargets --portal 172.27.0.55
--interface default
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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