US Robotics 7931 Guide de l'utilisateur télécharger pdf (Page 78)

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

You can specify a buffer size and a lock on an archive set basis by using the

-bufsize and -lock archive set copy parameters. For more information, see

“Archive Set Copy Parameters” on page 73.

The drives Directive: Controlling the Number of Drives

Used for Archiving

By default, the archiver uses all of the drives in an automated library for archiving.

To limit the number of drives used, use the drives directive.

This directive has the following format:

TABLE 3-4 Arguments for the bufsize Directive

Argument Meaning

media The media type. For the list of valid media types, see 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. For

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

lock Indicates whether the archiver should use locked buffers when making

archive copies. If lock is specified, the archiver sets file locks on the archive

buffer in memory for the duration of the sam-arcopy(1M) operation. This

avoids the overhead associated with locking and unlocking the buffer for each

I/O request and can thereby result in a reduction in system CPU time.

The lock argument should be specified only on large systems with large

amounts of memory. Insufficient memory can cause an out-of-memory

condition.

The lock argument is effective only if direct I/O is enabled for the file being

archived. By default, lock is not specified and the file system sets the locks

on all direct I/O buffers, including those for archiving. For more information

on enabling direct I/O, see the setfa(1) man page, the sam_setfa(3) library

routine man page, or the -O forcedirectio option on the

mount_samfs(1M) man page.

drives=auto-lib count

TABLE 3-5 Arguments for the drives Directive

Argument Meaning

auto-lib The family set name of the automated library as defined in the mcf file.

count The number of drives to be used for archiving activities.

1 2 ... 73 74 75 76 77 78 79 80 81 82 83 ... 287 288

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US Robotics 7931 Guide de l'utilisateur Page 78