Veritas Storage Foundation 5.0 for Oracle RAC Configuration Guide Extracts for HP Serviceguard Storage Management Suite, Second Edition, May 2008

Using FlashSnap for Backup and Recovery
Preparing Hosts and Storage for Database FlashSnap
Chapter 5
73
Preparing Hosts and Storage for Database FlashSnap
This section describes the following:
• “Setting Up Hosts” on page 73
• “Creating a Snapshot Mirror of a Volume or Volume Set Used by the Database” on
page 74
• “Upgrading Existing Volumes to Use Veritas Volume Manager 5.0” on page 78
Setting Up Hosts
Database FlashSnap requires sufficient Veritas Volume Manager disk space, and can be
used on the same host that the database resides on (the primary host) or on a secondary
host. Setting up a storage configuration for Database FlashSnap operations is a system
administrator’s responsibility and requires superuser (root) privileges. Database
FlashSnap utilities do not address setting up an appropriate storage configuration.
Single Host Configuration
Figure 5-1 shows the suggested arrangement for implementing Database FlashSnap
solutions on the primary host to avoid disk contention.
Figure 5-1 Example of a Database Flashsnap Solution on a Primary Host
Two Host Configuration
Figure 5-2 illustrates an off-host Database FlashSnap solution. This figure shows a
Database FlashSnap configuration with two hosts that allows CPU-intensive and
I/O-intensive operations to be performed for online backup and decision support without
degrading the performance of the primary host running the production database. A
two-host configuration also allows the snapshot database to avoid contending for I/O
resources on the primary host.
For off-host processing applications, both the primary and secondary hosts need to share
the storage in which the snapshot database is created. Both the primary and secondary
hosts must be able to access the disks containing the snapshot volumes.
Disks containing primary
volumes us ed to hold production
databases
Disks containing synchronized
full-sized ins tant snapshot
volumes
P
r
i
mary
H
ost
SCSI or Fibre Channel
Connectivity
1
2