US Robotics 7931 Guide de l'utilisateur télécharger pdf (Page 144)

120 Sun StorageTek SAM Archive Configuration and Administration Guide • Version 4, Update 6, 04/07

System Administrator Option Summary

As system administrator, you can change the maximum value and default value for

partial release when the file system is mounted. The mount(1M) options in

TABLE 4-1

affect partial release. For more information about the mount(1) command, see the

mount_samfs(1M) man page.

TABLE 4-1 Mount Options for Partial Release

mount(1M) Option Effect

-o maxpartial=n Determines the maximum amount of space, in kilobytes, that can remain in

online disk cache if a file is marked for partial release. The maximum value is

2,097,152 kilobytes, which is 2 gigabytes. The minimum value is 0, which

prevents any file from being partially released.

If –o maxpartial=0 is specified, the partial release feature is disabled, released

files are released completely, and no portion of a file remains in disk cache. Users

cannot override the value specified on this option after the file system is

mounted.

By default, the n argument is set to 16. This setting enables users to mark files for

partial release with the maximum amount remaining on disk being 16 kilobytes.

-o partial=n Sets a default amount of space, in kilobytes, to remain in disk cache if a user

marks a file for partial release by using the release(1) command’s –p option.

The n argument must be at least 8, but it can be as great as the value specified for

the –o maxpartial=n option.

Because some applications do not need access to the entire file to complete their

work, this option can be used to ensure that applications have the needed

beginnings of files available to them. At the same time, using this option

prevents files from being staged unnecessarily.

By default, n is 16.

Note: Even though a file has been partially released from a disk, it still takes up

space on the disk equal to one DAU.

-o partial_stage=n Specifies that when a partially released file is accessed, n bytes of the file must be

read before the entire file is staged from the archive media. This value is typically

set to be lower than the amount of the –o partial setting. For n, specify an

integer from 0 to the –o maxpartial specification. By default, this is 16, or

whatever value was specified for the –o partial option.

-o stage_n_window=n Specifies the amount of data to be staged at any one time to n. For n, specify an

integer from 64 to 2,048,000. The default is 256 kilobytes. This option applies only

to files that have the stage -n attribute set.

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US Robotics 7931 Guide de l'utilisateur Page 144