HP XP Array Manager Software - Manual (Page 9)

2 About Database Validator Operations
HP Database Validator Components
Figure 2 shows the HP Database Validator system components and their functions for Oracle data
validation checking. XP RAID Manager is used to specify the logical units (LUs) to be checked and
the type of check to be performed (the type depends on the Oracle version). The files that are checked
include data files (including tablespace files), redo log files, and control files. The files must be stored
on raw volumes. If data is written (I/O) from the host server to the storage system, the storage system
channel adapter (CHA) initiates the data check. If invalid data is detected, the write I/O is rejected
and the CHA reports the error to XP RAID Manager. Then, XP RAID Manager outputs an error to the
log (syslog).
Note: HP Database Validator is provided as a program product (license key) for the storage system.
Figure 2 Database Validator Components
Figure 3 shows that there are many components between the Oracle database program and the
storage system:
• Operating system
• I/O driver
• Logical Volume Manager (LVM)
• Fibre-channel (FC) host bus adapter (HBA)
• FC switch (and other network components)
These components may fail intermittently or persistently. When these failures are detected as errors,
the system administrator can take appropriate recovery action. However, it is possible that all layers
could pass the data without detecting the failure. The Oracle software and the storage system have
XP24000/XP20000 Database Validator User's Guide 9