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Tape Write Operations Fail for MHVTL if Block Size Is Not Set to 64 KB

KB ID: 2094
Product: Veeam Backup & Replication | 9.0 | 9.5 | 10 | 11 | 12 | 12.1 | 12.2 | 12.3 | 12.3.1 | 12.3.2 | 13
Published: 2016-02-02
Last Modified: 2025-07-28
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Challenge

All tape write operations fail for MHVTL drives if the data block size is not set to 65,536 bytes.

Cause

Starting in Veeam Backup & Replication v9, a new algorithm for automatically selecting the data block size was implemented. The software will automatically detect the highest available block size the tape drive reports being able to use and run jobs according to this value.  However, this does not operate correctly with the MHVTL emulated tape drives.
 
 

Solution

To resolve this issue, manually set the tape drive block size to 65536.

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