Adding ZSphere SAN data storage reports that an mpath device is in use

Issue/Introduction

This article helps troubleshoot mpath device in-use errors when adding ZSphere SAN data storage.

Symptoms

• Adding SAN data storage fails with can't open /dev/mapper/mpathm exclusively or Mounted filesystem.
• The multipath device is visible in the underlying system, but the platform cannot manage it as data storage.

Environment

• Product: ZVF
• Version: 4.x
• Component: ZSphere
• Affected object: SAN data storage
• Scenario: For storage and passthrough issues, confirm the current version, deployment type, storage type, and operation timeline.

Possible causes

• The filter rule in lvm.conf or