On Tue, Jul 28, 2020 at 8:56 AM Nick Kas via Users <users@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. > _______________________________________________ > Users mailing list -- users@ovirt.org > To unsubscribe send an email to users-le...@ovirt.org > Privacy Statement: https://www.ovirt.org/privacy-policy.html > oVirt Code of Conduct: > https://www.ovirt.org/community/about/community-guidelines/ > List Archives: > https://lists.ovirt.org/archives/list/users@ovirt.org/message/N5DNXQ5MAMPXMA3LOHM4RHUZLYKUUMLO/ >
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