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mminfo -mvV reports tape volumes as 100% utilized or full, even though the amount of data written is significantly less than the tape's native capacity. The issue can be observed on LTO-7, LTO-8, and LTO-9 media. Configuring Default Capacity through the NetWorker Management Console (NMC) to the tape's native capacity (for example, 6 TB for LTO-7, 12 TB for LTO-8, or 18 TB for LTO-9) does not take effect as expected. The configured capacity may be displayed incorrectly, such as 820 GB, instead of the specified value. Despite the incorrect utilization reporting, backup, clone, recovery, read, and write operations continue to function normally. The issue is cosmetic and informational only and does not indicate that the tape has reached its physical capacity.
NetWorker is functioning as designed. In the current NetWorker design, the maximum Default Capacity that can be reliably configured for LTO-7, LTO-8, and LTO-9 tape media is 4294 GB (approximately 4.2 TB). When the Default Capacity is configured at or below 4294 GB, the capacity is reported correctly. When the Default Capacity is configured above this value (for example, 6 TB, 12 TB, or 18 TB), NetWorker does not correctly apply the configured capacity value. As a result, the tape capacity may be displayed incorrectly, and the volume may be reported as 100% used even though substantial free space remains. This reporting issue is informational only and does not affect the ability to write to, read from, clone, or recover data from the tape.
NetWorker Engineering has confirmed that the current NetWorker implementation limits the maximum Default Capacity value to 4294 GB for LTO-7, LTO-8, and LTO-9 media. Larger capacity values cannot be configured reliably through the existing mechanism. If there is a business requirement to support configuring the correct native tape capacity through the NetWorker Management Console (NMC), a Request for Enhancement (RFE) can be raised through your Dell account team. Workaround: The only currently available method is to use the command line to label the tapes using the nsrjb or nsrmm command with the -c <capacity> option to specify the desired tape capacity. Example: nsrjb -LY -vvv -c <capacity> -j <jukebox_name> -S <slot_number> This method correctly applies the desired tape capacity.
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