The server allows certain operations to preempt other operations for access to volumes and devices. You can specify the NOPREEMPT option to disable preemption. When preemption is disabled, no operation can preempt another for access to a volume, and only a database backup operation can preempt another operation for access to a device.
For example, a client data restore operation preempts a client data backup for use of a specific device or access to a specific volume.
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Disable preemption among server operations:
nopreempt