Databases Reference
In-Depth Information
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if you need to modify the default infiniBand network addresses for your exadata database Machine, inform
your oracle sales representative ahead of time to ensure that oracle aCS arrives at your site prepared to perform a
nonstandard installation.
Note
6-5. Determining Your DATA and RECO Storage Requirements
Problem
You are filling out your database machine configuration worksheet prior to your Exadata Database Machine being
delivered and you need to decide how to configure storage for the
DATA
and
RECO
ASM disk groups.
Solution
In the
General Configuration
section of the Database Machine configuration worksheet, as discussed in Recipe 6-9,
there is a section named
Backup Method
. The valid choices include
Backups Internal to Oracle Exadata Database
Machine
and
Backups External to Exadata Database Machine
. When selecting to back up internal to the database
machine, the installation will build Exadata Storage Server grid disks and ASM disk groups under the assumption
that you will store your archived redo logs, Fast Recovery Area logs, and an RMAN level 0 backup inside an ASM
RECO
*
ASM disk group, and will allocate 60% of the available space to this set of
RECO
grid disks and 40% to
DATA
disks. If you
choose to back up external to the database machine, the installation will allocate 80% of available storage to data and
20% for recovery structures.
It is important to evaluate your overall backup strategy along with your usable storage capacity requirements
when deciding how to size your
DATA
and
RECO
storage. Several considerations should be evaluated prior to
completing your configuration worksheet:
•
Your desired ASM disk group redundancy, as discussed in detail in Recipes 5-4 and 6-6
•
Your current and projected usable storage capacity requirements, as presented in Recipes 5-5
and 5-6
•
Your database backup requirements and strategy, as presented in Recipe 5-8
RECO
ASM disk group sizing, as
•
Calculations to estimate your Fast Recovery Area and
presented in Recipe 5-9
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during the installation process, oracle aCS will configure your cell disk, grid disk, and aSM disk group storage
as you've specified in the configuration worksheet and will also build an oracle raC database on your compute nodes.
don't worry if you're unsure of your final storage configuration; many organizations will drop and delete oracle aCS-
installed databases and storage configurations, and if you're comfortable with storage administration topics on exadata,
you can recreate your storage at a later date. it becomes more difficult to change your configuration once you have
production databases installed and operational on your exadata, but this too can be adjusted with proper planning.
Note
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