Error Code 62:305 Tape volume block size selected is not supported by the underlying HBA card

Article ID: MM0025 Block size used is not supported by the Host Bus Adapter (HBA),


Attempt to access tape media reports the following error:

Error Code 62:305: 
Tape volume block size selected is not supported by the underlying HBA card. Change Block size on data path to a lower level and start a new media.


The HBA (Host Bus Adapter) card cannot handle the block size that is used, or the HBA is not supported, or the HBA is defective.

The default block size used is 64 KB, but 32 KB is appropriate for most HBA cards.


The block sizes that the Commvault software supports might not be supported by the HBA card. This procedure validates the block sizes that are supported by the Commvault software.

  1. In the CommCell Browser, navigate to Storage Policies | <library>.
  2. Right-click the appropriate drive, and then click Validate Drive.

    The Validate Drives dialog box appears.

  3. Select 32 from the Volume Block Size (KB) list, and then click OK.
  4. If the validation succeeded, configure the data paths to use a 32 KB block size.
    1. From the CommCell Browser, right-click the appropriate storage policy copy, and then clickProperties.

      The Copy Properties dialog box appears.

    2. Click the Data Paths tab.
    3. Select the appropriate data path, and then click Properties.

      The Data Path Properties dialog box appears.

    4. In the Block Size (KB) area, select Use specified value, and then select 32 from the list.
    5. Click OK.
    6. Click OK.
  5. If the validation does not succeed for the 32 KB block size, repeat the validation procedure with each of the supported block sizes until the validation succeeds.
  6. If the validation does not succeed regardless of which block size you used, then the HBA card might be defective and you must contact your library hardware vendor for assistance.