Dan,
It is an InnoDB bug: http://bugs.mysql.com/bug.php?id=61575
The workaround is to set /proc/sys/fs/aio-max-nr to a higher value according to http://dev.mysql.com/doc/innodb/1.1/en/innodb-performance-aio-linux.html
In XtraBackup 2.0.4 (with bug #1068459 fixed) it will also be possible to disable native AIO, as it is not actually used at the --backup stage anyway.
Dan,
It is an InnoDB bug: http:// bugs.mysql. com/bug. php?id= 61575
The workaround is to set /proc/sys/ fs/aio- max-nr to a higher value according to http:// dev.mysql. com/doc/ innodb/ 1.1/en/ innodb- performance- aio-linux. html
In XtraBackup 2.0.4 (with bug #1068459 fixed) it will also be possible to disable native AIO, as it is not actually used at the --backup stage anyway.