HP XP P9500 Storage - Manual (Page 159)

Restrictions on Data Retention volumes
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File systems using Data Retention
When using UNIX file system volumes with Data Retention, the volumes must be mounted
with the Read Only option by setting the Data Ret after the volumes are unmounted. ◦
◦ When using a Windows file system, use the “-x mount” and “-x umount” RAID Manager
command options with the above mentioned procedures.
◦ Data Retention volumes set to Write Protect Mode (Read ONLY) cannot be used for the
Windows file system (NTFS, FAT).
•
LVM(VxVM) on Data Retention
◦ When working with the LVM volumes to be used by Data Retention, LVM commands may
be writing to the volumes, and then Data Retention should be re-enabled.
•
Data Retention in HA Cluster Server
◦ If HA Cluster software writes to the metadata at regular intervals to confirm whether its
disks are available or not, then Data Retention should not be used in HA environments.
•
Dynamic disk on Windows systems
◦ Data Retention volumes cannot be used for the dynamic disk, because the dynamic disk
does not handle the volumes set to Write Protect Mode (Read ONLY). Data Retention
volumes must be used for basic disks only.
•
LUN#0
◦ Some operating systems cannot recognize LUNs over LUN#1 if LUN#0 has the Data
Retention “inv” attribute set. This is because some HBA drivers do not scan all LUNs on
a port if LUN#0 is invisible.
Database Validator
Database Validator prevents data corruption in an Oracle database by checking Oracle data
validation before an Oracle data block is written on a disk.
•
Data Block corruption: This occurs when Oracle data is corrupted by some intervening software
layer and/or hardware components. The RAID storage system can check the validity of the
data block before the Oracle data block is written to disk.
•
Data block address corruption: The OS (file system, LVM, Disk driver) may write blocks to the
wrong location. The RAID storage system can check the validity of the data block address to
verify that the Oracle data block is written to the correct location on disk.
•
Protection of Oracle volume: Oracle data files might be overwritten by a non-Oracle application
or by human operation using a command. The RAID storage system can protect volumes
storing Oracle files by preventing the volumes from being modified by another application or
by human error.
Data protection operations 159