View the Exhibit to examine the error obtained during the I/O calibration process. There are no data files on raw
devices. What is the reason for this error?
A.
The DISK_ASYNCH_IO parameter is set to TRUE.
B.
The FILESYSTEMIO_OPTIONS parameter is set to NONE.
C.
Another session runs the I/O calibration process concurrently.
D.
The pending area has not been created before running the I/O calibration process.
Explanation:
9.1.1.2 FILESYSTEMIO_OPTIONS Initialization ParameterYou can use the FILESYSTEMIO_OPTIONS initialization parameter to enable or disable asynchronous I/O or
direct I/O on file system files. This parameter is platform-specific and has a default value that is best for a
particular platform.
FILESYTEMIO_OPTIONS can be set to one of the following values:
ASYNCH: enable asynchronous I/O on file system files, which has no timing requirement for transmission.
DIRECTIO: enable direct I/O on file system files, which bypasses the buffer cache.
SETALL: enable both asynchronous and direct I/O on file system files.
NONE: disable both asynchronous and direct I/O on file system files.
To enable asynch I/O, set two values in the init.ora file (or spfile) and recycle the instances:
disk_asynch_io = true
filesystemio_options = asynch
The first one is default; so you may not have to change it. The default of the second one is NONE; so you will
probably have to change it. After setting these values and recycling the instance,