US Robotics 7931 Uživatelská příručka stáhnout pdf (Strana 159)

Chapter 5 Staging 135

For example, the following directive line specifies that only one drive from the dog

family set’s library be used for staging files:

For more information on the mcf file, see the mcf(4) man page.

You can also specify this directive by using the File System Manager software. For

more information, see the File System Manager online help.

Setting the Stage Buffer Size

By default, a file being staged is read into memory in a buffer before being restored

from the archive media back to online disk cache. You can use the bufsize directive

to specify a nondefault buffer size and, optionally, to lock the buffer. These actions

can improve performance, and you can experiment with various buffer-size values.

This directive has the following format:

TABLE 5-1 Arguments for the drives Directive

Argument Meaning

library The family set name of a library as it appears in the Sun StorageTek SAM mcf

file.

count The maximum number of drives to be used. By default, this is the number of

drives configured in the mcf file for this library.

drives = dog 1

bufsize = media buffer-size [lock]

TABLE 5-2 Arguments for the bufsize Directive

Argument Meaning

media Specify the archive media type from the list on the mcf(4) man page.

buffer-size A number from 2 through 1024. The default is 4. This value is multiplied by

the dev_blksize value for the media type, and the resulting buffer size is

used. The dev_blksize value is specified in the defaults.conf file. The

higher the number specified for buffer-size, the more memory is used. For

more information on this file, see the defaults.conf(4) man page.

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