Why the multipath doesn't work properly in Ubuntu?
If the user encounters the multipath device-mapper reports WWID ID as 3, this issue is related to a known situation on Ubuntu OS, we would suggest the user to refer the below link to fix this issue.
https://answers.launchpad.net/ubuntu/+source/multipath-tools/+question/671252
All XCubeSAN series model
If you still can't find an answer to what you're looking for, or you have a specific question, open a new ticket and we'd be happy to help!
Contact Us