Comment 1 for bug 1401775

Eugene,

Some back-of-the-envelope calculations show that with the given database size, innodb_log_file_size and transfer bandwidth the redo log size can be overrun with the average redo log write rate of just 2.25 MB/sec. Which doesn't look much, as in there are good chances your average load during the backup is higher in 50% cases.

Do you have an estimate on the average redo generation rate on that server? You can find tips on how to figure it out in this post: http://www.percona.com/blog/2012/10/08/measuring-the-amount-of-writes-in-innodb-redo-logs/