Veritas Storage Foundation for Oracle 5.0 Administrator's Guide, HP-UX 11i v3, Second Edition, December 2008

■ Create a separate disk group for Oracle database-related files.

■ Do not share volumes between Oracle database files and other

software.

■ ORACLE_HOME cannot be included in the snapshot mirror.

■ Resynchronization speed varies based on the amount of data

changed in both the primary and snapshot volumes during the

break-off time.

■ Do not share any disks between the original mirror and the

snapshot mirror.

■ Snapshot mirrors for datafiles and archive logs should be created

so that they do not share any disks with the data of the original

volumes. If they are not created in this way, the VxVM disk group

cannot be split and, as a result, Database FlashSnap will not work.

■ In Oracle RAC configurations, use the vxdctl -c mode command

to determine the hostname of the VxVM CVM master node. Prepare

the volume for being snapshot from this CVM master node.

Note: Database FlashSnap commands support third-mirror break-off

snapshots only. The snapshot mirror must be in the SNAPDONE state.

Usage notes

To create a snapshot mirror of a volume

Create a volume:

vxassist -g diskgroup make volume_name size disk_name

For example:

# vxassist -g PRODdg make snapvset_1 8g data01

Create a DCO and enable FastResync on the volume:

vxsnap -g diskgroup prepare volume_name [alloc=storage_attribute]

For example:

# vxsnap -g PRODdg prepare snapvset alloc="snap01"

Using Database FlashSnap for backup and off-host processing

Hosts and storage for Database FlashSnap

228