- Veeam Support Knowledge Base
- Tape Write Operations Fail for MHVTL if Block Size Is Not Set to 64 KB
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 | 13.1 |
| 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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