If a drive is owned by a library client or a storage agent, the library manager does not verify the drive access and readiness during the library manager initialization.
None.
In a shared library environment, the owner of a tape drive can change. If a tape drive is owned by a library client or storage agent, the library manager cannot access the tape drive. For example, if a library client or storage agent owns a tape drive, but the library manager halts or fails to respond, on startup, the library manager remembers the library client or storage agent that owns the drive, and skips processing this drive. If the library client or storage agent is not synchronized with the library manager and has no record of owning the drive, this can result in an inability to use the drive. In this case, you might need to reset the drive reservation from the host machine of the library client or storage agent.