3.5.3 PolyServe MxS Oracle Database Solution Pack Release Notes (August 2008)

Customization 14
The options are as follows:
Oracle init.ora Parameter for Oracle Disk
Manager
Although Oracle will function properly in conjunction with ODM
without any modification to the init.ora (or spfile), it is recommended
that care be taken to allow Oracle optimal Database Writer functionality.
Without ODM, it is common to configure a single Database Writer with
the db_writer_processes parameter and multiple Database Writer slaves
via the dbwr_io_slaves parameter.
With ODM, it is mandatory that Database Writer slaves not be
configured. Instead, the instance should be configured with a ratio of one
true Database Writer slave per four processors. For example, on a four-
processor system, the following is recommended:
db_writer_processes = 1
dbwr_io_slaves = 0
All init.ora parameters that ordinarily control asynchronous I/O are
essentially ignored when Oracle links with libodm.so. To that end, the
parameters can remain unset. Examples of “ignored” parameters are:
-d Detach and run as daemon
-s Stop after the last client exits
-p pidfile Write pid to file
-l logfile Write timestamped log file
-t traceflags Trace activities to log file (-l must be specified)
• disk_async_io • _dbwr_async_io
• _lgwr_async_io • filesystemio_options