Re: [ovirt-users] iSCSI Multipathing -> host inactive
Hi,
Am 16.08.2016 um 09:26 schrieb Elad Ben Aharon:
Currently, your host is connected through a single initiator, the
'Default' interface (Iface Name: default), to 2 targets: tgta and tgtb
I see what you mean, but the "Iface Name" is somewhat irritating here,
it does not mean that the wrong interface (ovirtmgmt) is used.
If you have a look at "Iface IPaddress" for both you can see that the
correct, dedicated interfaces are used:
Iface IPaddress: 10.0.131.122 (iSCSIA network)
Iface IPaddress: 10.0.132.122 (iSCSIB network)
(Target: iqn.2005-10.org.freenas.ctl:tgta and Target:
iqn.2005-10.org.freenas.ctl:tgtb). Hence, each LUN is exposed from the
storage server via 2 paths.
Since the connection to the storage is done via the 'Default' interface
and not via the 2 iSCSI networks you've configured, currently, the iSCSI
bond is not operational.
Please see above. The storage servers iSCSI-addresses aren't even
reachable from the ovirtmgmt net, they are in completely isolated networks.
For the iSCSI bond to be operational, you'll have to do the
following:
- Create 2 networks in RHEVM under the relevant cluster (not sure if
you've already did it) - iSCSI1 and iSCSI2 . Configure both networks to
be non-required networks for the cluster (should be also non-VM networks).
- Attach the networks to the host's 2 interfaces using hosts Setup-networks.
- Create a new iSCSI bond / modify the bond you've created and pick the
2 newly created networks along with all storage targets. Make sure that
the Default network is not part of the bond (usually, the Default
network is the management one - 'ovirtmgmt').
- Put the host in maintenance and re-activate it so the iSCSI sessions
will be refreshed with the new connection specifications.
This is exactly what I did, expect that I had to add the iSCSI-storage
first, otherwise the "iSCSI Multipathing" tab does not appear in the
data center section.
I configured an iSCSI-Bond and the problem seems to be that it leads to
conflicting iSCSI-settings on the host. The host uses the very same
interface twice only with different "IFace Name":
iSCSIA:
Iface Name: default
Iface Transport: tcp
Iface Initiatorname: iqn.1994-05.com.redhat:cda91b279ac5
Iface IPaddress: 10.0.131.122
Iface Name: enp9s0f0
Iface Transport: tcp
Iface Initiatorname: iqn.1994-05.com.redhat:cda91b279ac5
Iface IPaddress: 10.0.131.122
iSCSIB:
Iface Name: default
Iface Transport: tcp
Iface Initiatorname: iqn.1994-05.com.redhat:cda91b279ac5
Iface IPaddress: 10.0.132.122
Iface Name: enp9s0f1
Iface Transport: tcp
Iface Initiatorname: iqn.1994-05.com.redhat:cda91b279ac5
Iface IPaddress: 10.0.132.122
I guess this is the reason why the host has problems to attach the
storage domain, it toggles all storage domains on and off all the time.
Thank you,
Uwe