Why Does My Volume Attach Fail!?! – #OpenStack
Attaching and disconnecting Cinder volumes to Nova/Ironic instances is a complex process that can go wrong for many reasons. Problems arise from issues from the cinder backends to discovering volumes showing up on the host. Problems with the underlying Operating System or Iscsi subsytem affect os-brick. Corner cases like Nova live migration, shelf offload, and boot from volume complicate matters. We will take a deep dive into where the common problems come from and how to look for them.