The P9000 Database Validator implements Oracle's HARD framework which can validate the Oracle block structure, block integrity, and block location with numerous checks (more info).
Database Validator provides the P9500 Disk Array with an added level
of data protection when deployed in Oracle database environments.
Implementing Oracle's Hardware Assisted Resilient Data (HARD)
framework, it detects and corrects potential data corruption
introduced in the data I/O path and helps customers avoid unplanned
downtime. It can be deployed in HP UX/LVM and Sun Solaris/VxVM
environments. It is also supported in MC/ServiceGuard for HP UX
environments. When implemented in a complete Oracle HARD/P9500 Disk
Array solution, Database Validator works in conjunction with Oracle
HARD enabled databases to ensure that possible data corruptions
emanating from the connectivity path between the server and the P9500
are detected and rejected before they are committed to storage. If an
invalid/corrupt I/O is detected, Database Validator rejects the I/O
and reports the rejection to server and requests I/O retransmission.
At the same time, a SIM event message is passed to c track for remote
notification. Database Validator works in combination with other P9500
hardware and software to provide a complete Oracle HARD
Read more at the P9500 QuickSpecs PDF (page 28) here