LTFS has special requirements when it comes to hbas and can be picky. What card to do you have? What driver?
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Your HBA doesn't support I/O blocks of 512K. While raw LTFS allows you to set other block sizes when you format a tape, the HP StoreOpen app does not. Additionally, using other blocks sizes can make your LTFS volumes incompatible with other platforms' / vendors' LTFS configurations.
The only solution is to change your SAS HBA for a card that supports larger block sizes - we recommend ATTO Technology R680 (RAID) and H680 (non-RAID) cards even for Windows and Linux.