[SCv3000] Fail to re-map a volume (failed to create object)

Hello,

We just bought a SCv3000 Compellent SAN and I've created some volumes.

Our Redhat 7.5 servers are connected through dedicated iSCSI VLANs.

The first 3 volumes I created were happily mapped to *two* servers (this is needed by RHEV) and it's working.

Some other 7 volumes are to be mapped to 2 others servers.

The first server can map to these 7 volumes.

But when trying to map these volumes to the second server, some are working and some are failing.

I noticed that on each volume one can see the active controller (top or bottom).

The volume that can be mapped are only the ones on the top controller.

When trying to use the volumes managed by the bottom controller, I get the error "could not create object, please see logs", and in the logs, it just reads 'Bad LUN'.

On the servers list, I indeed see in the connectivity tab the following :

• iSCSI Fault domain 1 : two correct links on the top controller
• iSCSI Fault domain 2 : two correct links on the top controller

I see nothing about the bottom controller (though it is correctly wired).

And I read the message "Only 4 of 8 paths to the server are up".

I see no red cross or nothing else.

The server HBAs list is showing only one HBA of iSCSI port type. (is this normal ?)

On the Linux command, I ran an iscsiadm discovery towards both SAN's targets, and manually ran the connections to the 8 iqn.

Four of them were missing, thus they connected nicely.

Then, on the connectivity tab, the links to the bottom controller appeared.

I was then able to map the missing volumes to this server.

Is this normal to see only one HBA (each Linux server has two HBAs with a dedicated ip on its dedicated VLAN)?