Comment 2 for bug 1349543

This page correctly says that the --throttle option only has effect with the --backup option:

http://www.percona.com/doc/percona-xtrabackup/2.1/xtrabackup_bin/throttling_backups.html

"
In --backup mode, this option limits the number of pairs of read-and-write operations per second that xtrabackup will perform. If you are creating an incremental backup, then the limit is the number of read IO operations per second.
"

And so does this page:

http://www.percona.com/doc/percona-xtrabackup/2.1/xtrabackup_bin/xbk_option_reference.html#cmdoption-xtrabackup--throttle

"
This option limits --backup to the specified number of read+write pairs of operations per second. See throttling a backup.
"

But the corresponding page describing the _innobackupex_ option does not say that:

http://www.percona.com/doc/percona-xtrabackup/2.1/innobackupex/throttling_ibk.html

Neither does this page:

http://www.percona.com/doc/percona-xtrabackup/2.1/innobackupex/innobackupex_option_reference.html#cmdoption-innobackupex--throttle

Converting to a documentation request to make all innobackupex-related pages + built-in help in innobackupex itself consistent with the xtrabackup option description, i.e. make it clear that it only applies to the backup stage, not to the copy-backup or apply-log ones.