There are 31 instances in our environment out of which almost 20 instance backups are failed, due to slowness. We are getting below error.
xtrabackup: error: log block numbers mismatch:
xtrabackup: error: expected log block no. 660048145, but got no. 661096713 from the log file.
xtrabackup: error: it looks like InnoDB log has wrapped around before xtrabackup could process all records due to either log copying being too slow, or log files being too small.
181121 17:32:05  …done
xtrabackup: Error: xtrabackup_copy_logfile() failed
we observed slowness while execution of Backups.