||Oracle Tips by Burleson
Oracle10g Grid Computing
Chapter 12 - RAC Design Considerations
Designing Equipment for Real Application Clusters
the SAN, perhaps a SUN T3, Hitachi or EMC Clariion or Symmetrix, can
be configured using redundant disk configurations such as RAID-1,
RAID5, or a combination (sometimes called "plaid") of RAID1 and RAID5
that virtually eliminates downtime from the loss of a single disk.
However, it should be stressed that application performance can suffer
horribly from a disk failure during a disk rebuild with installed
spares or a rebuild of the information using parity information from
the other disks in a RAID5 set.
What are the
effects of component failure?
Let's take a quick look at the effects of component failure.
Failure of the Internet or Intranet
While not a
component that a DBA usually has control over, failure of the Internet
connection (usually due to the provider having a failure) means no one
outside the company can access the application. Failure of the
intranet or internal networks means no one inside the company can
access the application. These components (usually comprised of
multiple components) should also have built in redundancy.
Failure of the Firewall
acts as the gatekeeper between the company’s assets and the rest of
the world. If the database is strictly internal (no connection to the
web), then a firewall is not needed. If there is only one firewall, a
failure will prevent anyone outside the firewall (i.e., the rest of
the universe) from contacting the database. Internal users may still
have access (those "inside" the firewall) and some limited processing
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