Veritas Storage Foundation™ 5.0.1 for Oracle RAC Installation, Configuration, and Administrator's Guide Extracts for the HP Serviceguard Storage Management Suite on HP-UX 11i v3
Figure 5-2 Example of an Off-host Database FlashSnap Solution
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Host and Storage Requirements
Before using Database FlashSnap, ensure that:
• All files are on VxFS file systems over VxVM volumes. Raw devices are not supported.
• Symbolic links to datafiles are not supported.
• ORACLE_HOME is on a separate file system.
• Archive logs are on a separate VxFS file system and are on a different VxFS file system than
Oracle datafiles or ORACLE_HOME.
• The database does not contain BFILES and external tables.
• Oracle datafiles, archive logs, redo logs, and control files are in a single disk group.
In addition, before attempting to use Database FlashSnap with two hosts, ensure that:
• The versions of HP Serviceguard for Oracle RAC on the primary and secondary hosts are
the same.
• The same version of Oracle is installed on both hosts
• The Oracle binaries and datafiles are on different volumes and disks.
• The UNIX login for the database user and group must be the same on both hosts.
• You have a HP Serviceguard for Oracle RAC license on both hosts.
Creating a Snapshot Mirror of a Volume or Volume Set Used by the Database
With Database FlashSnap, you can mirror the volumes used by the database to a separate set of
disks, and those mirrors can be used to create a snapshot of the database. These snapshot volumes
can be split and placed in a separate disk group. This snapshot disk group can be imported on
a separate host, which shares the same storage with the primary host. The snapshot volumes can
be resynchronized periodically with the primary volumes to get recent changes of the datafiles.
If the primary datafiles become corrupted, you can quickly restore them from the snapshot
volumes. Snapshot volumes can be used for a variety of purposes, including backup and recovery,
and creating a clone database.
You must create snapshot mirrors for all of the volumes used by the database datafiles before
you can create a snapshot of the database. This section describes the procedure used to create
snapshot mirrors of volumes.
You can use the vxsnap CLI command to create a snapshot mirror.
54 Using FlashSnap for Backup and Recovery