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Chapter 3 Archiving 77

Maximizing Space on a Volume: -fillvsns

By default, the archiver selects from all volumes assigned to an archive set when it

writes archive copies, using a volume with enough space for all the files. This action

can result in volumes not being filled to capacity. If -fillvsns is specified, the

archiver separates the archive request into smaller groups.

Specifying Archive Buffer Locks: -lock

By default, a file being archived is stored in memory in a buffer before being written

to archive media. If direct I/O is enabled, you can use the -lock parameter to lock

this buffer. This action can improve performance.

This parameter has the following format:

The -lock parameter indicates that 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 paging of the buffer, and can thereby improve performance.

The -lock parameter should be specified only on large systems with large amounts

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

The -lock parameter 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 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.

For example, this parameter can be specified in the archiver.cmd file in a line such

as the following:

You can also specify the equivalent of this parameter on a global basis by specifying

the lock argument to the bufsize=media buffer-size [lock] directive. For more

information on this topic, see “The bufsize Directive: Setting the Archiver Buffer

Size” on page 53.

-lock

yourset.3 -lock

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