Using Serviceguard Extension for RAC, 7th Edition, September 2008

ManualsBrandsHP ManualsSoftwareHP Serviceguard Extension for RAC (SGeRAC)

Considerations on using CFS for RAC datafiles and Server Management Storage (SRVM)

Use the following list when considering to use CFS for database storage:

• Single file system view

— Simpler setup for archive recovery since archive area is visible by all nodes

• Oracle create database files

• Online changes (OMF - Oracle Managed Files) within CFS

• Better manageability

• Manual intervention when modifying volumes, DGs, disks

• Requires the SGeRAC and CFS software

CFS and SGeRAC is available in selected HP Serviceguard Storage Management Suite

bundles.

Refer to your verion of the HP Serviceguard Storage Management Suite Version Release Notes.

Considerations on using Raw Volumes for RAC datafiles and Server Management storage (SRVM)

Use the following list when considering to use Raw Volumes for database storage:

• SLVM is part of SGeRAC.

• Create volumes for each datafile.

• CVM 4.x or later

— Disk group activation performed by disk group multi-node package.

— Disk group activation performed by application package (without the HP Serviceguard

Storage Management Suite bundle).

• CVM 3.x

— Disk group activation is performed by application package.

Volume Planning with CVM

Storage capacity for the Oracle database must be provided in the form of volumes located in

shared disk groups. The Oracle software requires at least two log files (and one undo tablespace

for Oracle9) for each Oracle instance, several Oracle control files and data files for the database

itself. For all these files, Serviceguard Extension for RAC uses HP-UX raw volumes, which are

located in disk groups that are shared between the nodes in the cluster. High availability is

achieved by using high availability disk arrays in RAID nodes. The logical units of storage on

the arrays are accessed from each node through multiple physical volume links via DMP (Dynamic

Multi-pathing), which provides redundant paths to each unit of storage.

Fill out the Veritas Volume worksheet to provide volume names for volumes that you will create

using the Veritas utilities. The Oracle DBA and the HP-UX system administrator should prepare

this worksheet together. Create entries for shared volumes only. For each volume, enter the full

pathname of the raw volume device file. Be sure to include the desired size in MB. Following is

a sample worksheet filled out. Refer to Appendix B: “Blank Planning Worksheets”, for samples

of blank worksheets. Make as many copies as you need. Fill out the worksheet and keep it for

future reference.

ORACLE LOGICAL VOLUME WORKSHEET FOR CVM Page ___ of ____

===============================================================================

RAW LOGICAL VOLUME NAME SIZE (MB)

Oracle Control File 1: ___/dev/vx/rdsk/ops_dg/opsctl1.ctl______100______

Oracle Control File 2: ___/dev/vx/rdsk/ops_dg/opsctl2.ctl______100______

Oracle Control File 3: ___/dev/vx/rdsk/ops_dg/opsctl3.ctl______100______

Instance 1 Redo Log 1: ___/dev/vx/rdsk/ops_dg/ops1log1.log_____20______

Instance 1 Redo Log 2: ___/dev/vx/rdsk/ops_dg/ops1log2.log_____20_______

Instance 1 Redo Log 3: ___/dev/vx/rdsk/ops_dg/ops1log3.log_____20_______

Instance 1 Redo Log: ___________________________________________________

Planning Database Storage 75