Database Reference
In-Depth Information
Disk Failure Simulation
Chances are high that you have never had to deal with disk failure in an ASM environment. To
prepare yourself for such a case, you may wish to use the environment set up in this chapter
to simulate disk failure and gain experience with repairing an ASM setup. Disk failure may be
simulated by placing cooked files on an external FireWire disk drive, USB disk drive, or USB
stick, and pulling the cable to the disk or the stick. In a SAN environment, disk failure might by
simulated by pulling cables, changing the zoning configuration, or removing logical unit
number (LUN) access rights in a storage array. The term zoning is used to describe the config-
uration whereby a storage area network administrator separates a SAN into units and allocates
storage to those units. Each disk or LUN in a SAN has a unique identification called a worldwide
number (WWN). If a WWN is made invisible to a system by changing the zoning configuration,
neither ASM nor RDBMS instances will be able to use the LUN.
Source Code Depot
Table 2-1 lists this chapter's source files and their functionality.
Table 2-1.
Hidden Parameters Source Code Depot
File Name
Functionality
10g_hidden_parameters.html
Complete list of undocumented parameters in Oracle10
g
with default values and descriptions
11g_hidden_parameters.html
Complete list of undocumented parameters in Oracle11
g
with default values and descriptions
9i_hidden_parameters.html
Complete list of undocumented parameters in Oracle9
i
with
default values and descriptions
hidden_parameters.sql
SELECT
statement for retrieving all hidden parameters with
their values and descriptions
hidden_parameter_value.sql
SELECT
statement for retrieving the value of a single hidden
parameter
