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Explanation: A robotic mount operation could not be completed because physical drive resources are not available for the request. This error may result from an environment that is based on virtualized resources, such as one involving the Storagenet 6000 Storage Domain Manager (SN6000).
The SN6000 virtualizes tape drives. Some SN6000 configurations may have more logical drives than the number of physical drives (or equivalent resources) available for drive requests. Also, the relationship between the number of logical drives and physical drives may change as hardware failures occur. NetBackup scheduling, drive allocation, and drive assignment algorithms can only determine logical drive availability. NetBackup attempts to fully utilize all configured and available logical drives. If the number of required logical drives exceeds the physical drives available, a NetBackup job may be started with insufficient drive resources. Instead of queueing the job in the scheduler, the job runs and encounters the resource issue when it makes an ACS tape mount request.
Install the Shared Storage Option (SSO) license for mount requests to requeue when physical drive resources are not available.
The number of drives that can be in use at any one time is limited. Configure backup windows so the different storage units that are tied to the same physical drives are active only at non-overlapping times. Increase the media mount timeout to avoid job failures when the job cannot get a physical drive due to the drives all being busy.