US Robotics 7931 Guía de usuario descargar pdf (Pagina 143)

Chapter 4 Releasing 119

■ If the -o partial_stage=n option is set to the size of the partial release stub,

the default behavior prevents the file from being staged until the application

reaches the end of the partial release stub. Waiting until the end of the stub is

reached causes a delay in accessing the rest of the file.

■ If the -o partial_stage=n option is set to a value smaller than the partial

release stub, the file is staged after the application crosses the threshold set by the

-o partial_stage=n option. This reduces the chance of a delay in accessing

the rest of the file data.

For example, assume that the following options are in effect:

■ -o partial_stage=16 (16 kilobytes)

■ -o partial=2097152 (2 gigabytes)

■ -o maxpartial=2097152 (2 gigabytes)

The filemgr(1) program reads the first 8 kilobytes of a file. The file is not staged. A

video-on-demand program reads the same file, and the file is staged after it reads

past the first 16 kilobytes of the file. The application continues reading the 2

gigabytes of disk data while the archive tape is mounted and positioned. When the

video-on-demand program reads past 2 gigabytes of file data, the application reads

immediately behind the staging activity. The application does not wait, because the

tape mounting and positioning is done while the application reads the partial file

data.

Several command-line options affect whether a file can be marked for partial release.

Some options are enabled by the system administrator, and others can be enabled by

individual users. The following sections describe the release characteristics that can

be set by the various types of users.

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US Robotics 7931 Guía de usuario Pagina 143